-4151经过怎样的转换椭圆形可以变成什么61385
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怎样转换SWF格式变成MP4的视频呀? 谁能给推荐一个软件呀_百度知道
怎样转换SWF格式变成MP4的视频呀? 谁能给推荐一个软件呀
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转换大师 功能全面的视频转换器，可以将视频转换为AVI （DivX、XviD）DV AVI、MP4（Sony PSP、Apple iPod、iPhone、AppleTV、Archos DVR、Creative Zen、MS Zune）、WMV、3GP、3G2、PSP、MP4、QuickTime（MOV、QT）、SWF、DVD、VOB、VRO、MPEG 1,2、MPG、DAT、VCD、SVCD、ASF、MJPEG、H.263、H.264、Real Video（RM、RMVB）、DVR-MS、MKV等格式。它使用方便，转换速度很快，品质也很高。转换大师 转换质量和速度绝对好，支持将几乎所有视频格式比如：RM/RMVB/VOB/AVI/MPEG/DAT/VCD/SVCD/DVD/ASF/WMV/MOV/QT/MP4/3GP/3GPP2/DV/YUV等视频文件转换为普通MP4机、SONY PSP、PS3、iPod(Video/Touch/Classic/Nano)、iPhone、Apple TV、3GP/3GPP2/MP4手机或DVD影碟机等硬件支持的AVI/MPEG4/3GP/3GPP2/MP4视频格式；更是支持Flash的SWF/FLV文件的导出，同时还允许将多种格式转换为RM和RMVB格式。
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出门在外也不愁(转）《软件工程的实事与谬论》（二）_java中OutOfMemoryError:PermGen space的程序处置方法_Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献__脚本百事通
稍等，加载中……
^_^请注意，有可能下面的2篇文章才是您想要的内容：
(转）《软件工程的实事与谬论》（二）
java中OutOfMemoryError:PermGen space的程序处置方法
Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献
(转）《软件工程的实事与谬论》（二）
(转）《软件工程的事实与谬论》（二）
没什么可说的，喜欢ctrl_c + ctrl_v.原url: /hydrangea/blog/item/4b826c0ef9cab3c97bcbe1ba.html1.2 工具和技术 事实5：夸大宣传是软件的瘟疫。多数软件工具对于效率和质量的提高幅度仅为5%～35%。但是总有人反复说提高幅度是“数量级”的。 事实6：在学习新工具或者新技术的初期，程序员的工作效率和产品质量都会下降，只有克服了学习曲线之后，才可能得到实质性的收益。只有满足下面两个条件，采用新工具或新技术才有意义：(a)新东西确实有用；(b)要想获得真正的收益，必须耐心等待。 事实7：软件开发者对于工具说的多，评估的少，买的多，用的少。 关于工具和技术，我从来不觉得什么工具或者技术可以对软件的效率和质量有“数量级”的提高，比较赞同书中的观点。比如说，现在使用C#做一些应用软件，就会比使用C++的效率要高一些，并且质量也会有所提高。但是提高的比例，对于不同的人来说，肯定会有很大的差别。尽管并不一定所有的人都持这样的观点，像一些经验非常丰富的C++高手，也许就不这么认为。 人们总是会偏向于使用自己所熟知的工具和技术来解决现有的问题。因为学习曲线的存在，在学习新的工具和技术的初期，工作效率是肯定会下降的，很可能出现很简单的东西，都需要查资料才能解决。但是如果新的技术和工具确实是有用，在对新技术的掌握到一定程度之后，工作效率的提高才会显现出来，而在这之前，必须要有耐心，这个过程可能是1个月、1年甚至更久。 对于事实7，没有什么认识。印象中，我现在的公司也是这样的。买了很多工具，但是实际使用的也就那么几个，相当一部分工具，花钱买了放着睡觉。平时也就是说说，什么工具好用，什么不好用而已。评估就更谈不上了。
java中OutOfMemoryError:PermGen space的程序处置方法
java中OutOfMemoryError:PermGen space的程序处理方法我们的java程序在运行时出现OutOfMemoryError: PermGen space有以下解决办法：
1、尽早释放无用对象的引用。好的办法是使用临时变量的时候，让引用变量在退出活动域后，自动设置为null，暗示垃圾收集器来收集该对象，防止发生内存泄露。
对于仍然有指针指向的实例，jvm就不会回收该资源,因为垃圾回收会将值为null的对象作为垃圾，提高GC回收机制效率；
2、我们的程序里不可避免大量使用字符串处理，避免使用String，应大量使用StringBuffer，每一个String对象都得独立占用内存一块区域；
String str = "aaa";
String str2 = "bbb";
String str3 = str + str2;//假如执行此次之后str ,str2以后再不被调用,那它就会被放在内存中等待Java的gc去回收,程序内过多的出现这样的情况就会报上面的那个错误,建议在使用字符串时能使用StringBuffer就不要用String,这样可以省不少开销；
3、尽量少用静态变量，因为静态变量是全局的，GC不会回收的；
4、避免集中创建对象尤其是大对象，JVM会突然需要大量内存，这时必然会触发GC优化系统内存环境；显示的声明数组空间，而且申请数量还极大。
5、尽量运用对象池技术以提高系统性能；生命周期长的对象拥有生命周期短的对象时容易引发内存泄漏，例如大集合对象拥有大数据量的业务对象的时候，可以考虑分块进行处理，然后解决一块释放一块的策略。
6、不要在经常调用的方法中创建对象，尤其是忌讳在循环中创建对象。可以适当的使用hashtable，vector 创建一组对象容器，然后从容器中去取那些对象，而不用每次new之后又丢弃
7、一般都是发生在开启大型文件或跟数据库一次拿了太多的数据，造成 Out Of Memory Error 的状况，这时就大概要计算一下数据量的最大值是多少，并且设定所需最小及最大的内存空间值。
原文链接：/service/faq/softfaq/jsp/7.html
Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献
Spads 出品字符串高效提取数值方法 Shane 末日圣诞奉献Spads 出品，作者 WangXP 与 Shane目录---------- ---------- ---------- ----------1 【综述】2 【程序】3 【功能】4 【性能】5 【附录】1 【综述】---------- ---------- ---------- ----------最近因为继续编写公式处理和 Json - Java 互转组件，所以专门制作、优化了字符串变成数值的工具方法，并在性能上取得了领先于阿帕奇工具和爪哇类库等方式的成就。本方法基本思路是逐字符扫描。目前关于将字符串转为数值，市面上常见的资料，我搜索总结了十几篇吧，大体是重复的，包括这么几种方法。我看过的资料网址收集在附录中。1、通过 Java 系统提供的 Character#isDigit(char) 判断是否为数值，然后转换。2、通过正则表达式判断是否为数值，然后转换。3、直接转换，捕捉异常。4、阿帕奇提供了 isNumeric(String) 和 isNumericSpace(String) 方法用以判断。如果是数值再转换。目前我这边的需求是，需要支持整数、数字间的空格、空白头尾、小数以及直接小数点开头的小数。JavaLib 的 isDigit(char) 只能判断数字，所以需要事先去除空格、首位负号和第一个小数点。正则表达式在转换前需要去除空格直接转换前也需要去除空格阿帕奇工具方法能判断数字和空格，所以需要事先去除首位负号和第一个小数点。Spads 编写程序是直接利用了字符特点，扫描字符串。也可以认为是一种结合了预处理与字符 ASCII 判断的方法。本方法会将能够解析成数值的字符串解析成数值，否则返回 null 。2 【程序】---------- ---------- ---------- ----------Spads 直接编写了适用的程序，经过很长时间性能优化，达到了优于上述所有方法的效果。代码如下。
* &b&抽取字符串的数字值&/b&&br/&
* 本方法用来将传入字符串的内容理解为十进制数值。如果传入字符串的内容无法理解为
* 数值，则返回 &code&null&/code& 。数值字符串是指包括正、负的整数、浮点数；其中
* 允许出现分割用空格，允许直接使用小数点起头以表示 0.x 样的小数。&br/&
* 方法使用示例如下。
* StringTool.fetchNumberValue("15") = 15 (java.lang.Integer)
* StringTool.fetchNumberValue("300 ")
(java.lang.Long)
* StringTool.fetchNumberValue(" 28 ") = 28 (java.lang.Integer)
* StringTool.fetchNumberValue("3.8") = 3.8 (java.lang.Double)
* StringTool.fetchNumberValue("-99") = -99 (java.lang.Integer)
* StringTool.fetchNumberValue("+15") = null
* StringTool.fetchNumberValue(".45") = 0.45 (java.lang.Double)
* StringTool.fetchNumberValue("-.1") = -0.1 (java.lang.Double)
* StringTool.fetchNumberValue("0x3AFF0") = null
* StringTool.fetchNumberValue("042") = 42 (java.lang.Integer)
* StringTool.fetchNumberValue("Spads") = null
* StringTool.fetchNumberValue("") = null
* StringTool.fetchNumberValue(null) = null
* StringTool.fetchNumberValue("5 - 3") = null
* StringTool.fetchNumberValue("3.8") = null
* StringTool.fetchNumberValue("94")
* = 1.711E37 (java.lang.Double)
* 本方法不涉及正则表达式，同时未避免生成异常的巨大系统消耗，通过遍历字符串每
* 一个字符来判断其是否符合十进制数值格式，格式不符则直接返回
* &code&null&/code& 。如果格式符合，浮点数按 {@link Double} 识别，整数按
* {@link Long} 识别。如果数值范围符合 {@link Integer} ，则转换。
StringTool#removeChar(String, char)
numStr 准备提取数值的字符串
传入字符串按十进制理解的数值对象，其类型有可能为
* &code&Long&/code& 、 &code&Integer&/code& 或者 &code&Double&/code&。
* @exception NumberFormatException 当字符串是整数但超过了
* {@link Long#MIN_VALUE} - {@link Long#MAX_VALUE} 范围同时其位数并不大于 20，
* 或者字符串是浮点数 但超过了
* {@link Double#MIN_VALUE} - {@link Double#MAX_VALUE} 范围。
static public Number parseNumber(String numStr)
if (numStr == null || (numStr = numStr.trim()).length() == 0)
final StringBuilder numBuilder = new StringBuilder();
boolean doubleFlag =
final int length = numStr.length();
for (int index = 0; index != index++)
numChar = numStr.charAt(index);
if (numChar & 57)
switch (StringTool.charType[numChar])
// 在之前没有小数点的情况下出现小数点，记录，同时认为此字符串是浮点数
if (doubleFlag || index == length - 1)
doubleFlag =
// 此处通过
// 如果是数字，认为此字符串还是数值，检查下一个字符
case 4: numBuilder.append(numChar);
// 此处通过
// 如果是空格，直接检查下一个字符
// 如果是负号，又不是首位，则按非数值字符串进行返回
if (index == 0)
numBuilder.append(numChar);
// 此处通过
// 如果字符不符合数值格式，方法按非数值字符串进行返回
if (doubleFlag || length & 20)
return Double.valueOf(numBuilder.toString());
// 非浮点数情况，如果数值在整数范围内，则按整数返回。否则按长整数返回。
final long num = Long.parseLong(numBuilder.toString());
final int finalNum = (int)
if (finalNum != num)
return finalN
* &b&字符类型数组&/b&&br/&
* 为字符串抽取数值含义提供的字符类型获取器。通过将字符本身作为此数组下标获取对应
* 类型。类型用整数表示，含义如下。&br/&
* 1 为空白间隔，对应 &code&' '&/code& 和 &code&'\t'&/code&&br/&
* 2 为负号，对应 &code&'-'&/code&&br/&
* 3 为小数点，对应 &code&'.'&/code&&br/&
* 4 为数字，对应 &code&'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'&/code&
static private int[] charType = {
0,0,0,0,0, 0,0,0,0,1,
0,0,0,0,0, 0,0,0,0,0,
0,0,0,0,0, 0,0,0,0,0,
0,0,1,0,0, 0,0,0,0,0,
0,0,0,0,0, 2,3,0,4,4,
4,4,4,4,4, 4,4,4
经过测试，发现本方法可以完美地达到需要的处理效果。以下是测试报告。Function test...
---------- ---------- ---------- ----------
String: 15
In StringTool way, get: 15 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 28 (Integer)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: 3.8 (Double)
---------- ---------- ---------- ----------
String: -99
In StringTool way, get: -99 (Integer)
---------- ---------- ---------- ----------
String: .45
In StringTool way, get: 0.45 (Double)
---------- ---------- ---------- ----------
String: -.1
In StringTool way, get: -0.1 (Double)
---------- ---------- ---------- ----------
String: null
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 0x3AFF0
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 042
In StringTool way, get: 42 (Integer)
---------- ---------- ---------- ----------
String: Spads
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 5 - 3
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 三十八
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 39501.50
In StringTool way, get: 39501.5 (Double)
---------- ---------- ---------- ----------
String: 0.
In StringTool way, get: 3.85427E-4 (Double)
---------- ---------- ---------- ----------
In StringTool way, get: 0. (Double)
---------- ---------- ---------- ----------
In StringTool way, get:
---------- ---------- ---------- ----------
String: 300
In StringTool way, get:
---------- ---------- ---------- ----------
String: -570
In StringTool way, get: - (Long)
---------- ---------- ---------- ----------
String: -5
In StringTool way, get: -5 (Long)
---------- ---------- ---------- ----------
In StringTool way, get:
---------- ---------- ---------- ----------
String: 2015773
In StringTool way, get: 2015773 (Integer)
---------- ---------- ---------- ----------
String: 3850
In StringTool way, get: 3850 (Integer)
---------- ---------- ---------- ----------
String: -80058
In StringTool way, get: -80058 (Integer)
---------- ---------- ---------- ----------
String: -1
In StringTool way, get: - (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 3 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 0 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: -5.308E32 (Double)
---------- ---------- ---------- ----------
String: 78 52
In StringTool way, get: 7.296E21 (Double)
---------- ---------- ---------- ----------
String: 94
In StringTool way, get: 1.711E37 (Double)
---------- ---------- ---------- ----------
3 【功能】---------- ---------- ---------- ----------Spads 推出的 parseNumber(String) 方法能够完整地实现解读数值字符串的功能。那么其它几种方法表现如何呢？其它方法的程序代码经过 Shane 认真处理，依然有 200 多行。我就不每行都贴出来了。这里简述一下各种方法所使用的方式。A、简单爪哇类库方法 SimpleJavaLibB、爪哇类库方法 JavaLib核心判断方法private boolean isNumericByJavaLib(CharSequence numSequence)
for (int i = numSequence.length(); --i &= 0; )
if (!Character.isDigit(numSequence.charAt(i)))
SimpleJavaLib 将字符串直接传入此检测方法进行判断，如果检验通过则直接按 Long 类型转换。JavaLib 方法首先给字符串去除空格、首位负号和第一个小数点，然后再传入此检测方法进行判断；如果检验通过则根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。C、简单正则表达式 SimpleRegex用 \d* 来判断，然后按长整数转换。D、完整正则表达式 WholeRegex用 ^[-]?(((\s|\d)*\d(\s|\d)*(\.(\s|\d)*\d(\s|\d)*)?)|(\.(\s|\d)*[1-9](\s|\d)*)) 来判断。如果检验通过则根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。E、直接转换捕捉异常 Direct根据字符串是否含有 '.' 字符，决定用 Double 转换还是用 Long 转换。如果转换发生异常，则返回 null 。如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。F、直接判断字符 CharAsciiprivate Number fetchNumberByCharAscii(String numStr)
for (int i = numStr.length(); --i &= 0; )
int chr = numStr.charAt(i);
if (chr & 48 || chr & 57)
return Long.valueOf(numStr);
G、简单阿帕奇工具方法 SimpleApacheUtils核心判断方法为 mons.lang3.StringUtils.isNumeric(CharSequence)其余部分与 A 类似H、完整阿帕奇工具方法 WholeApacheUtils核心判断方法为 mons.lang3.StringUtils.isNumericSpace(CharSequence)首先给字符串去除首位负号和第一个小数点，然后再传入此检测方法进行判断；如果检验通过则先消除空格，然后根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。我设计了这些测试用字符串，以检测各种方法的功能private String[] numStrs = {
"15", "\t28 ", "3.8", "-99", ".45", "-.1", null,
"0x3AFF0", "042", "Spads", "", "
", "5 - 3", "三十八",
"3.8", "39501.50", "0.", ".",
"", "300 ", "-570 ", "-5",
"", "2015773", "3850", "-80058", "-1 ", "3", "0",
"-", "78 52 ",
检测结果如下。Function test...
---------- ---------- ---------- ----------
String: 15
In StringTool way, get: 15 (Integer)
In SimpleJavaLib way, get: 15 (Long)
In JavaLib way, get: 15 (Integer)
In SimpleRegex way, get: 15 (Long)
In WholeRegex way, get: 15 (Integer)
In Direct way, get: 15 (Integer)
In CharAscii way, get: 15 (Long)
In SimpleApacheUtils way, get: 15 (Long)
In WholeApacheUtils way, get: 15 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 28 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 28 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 28 (Integer)
In Direct way, get: 28 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 28 (Integer)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: 3.8 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 3.8 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 3.8 (Double)
In Direct way, get: 3.8 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 3.8 (Double)
---------- ---------- ---------- ----------
String: -99
In StringTool way, get: -99 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -99 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -99 (Integer)
In Direct way, get: -99 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -99 (Integer)
---------- ---------- ---------- ----------
String: .45
In StringTool way, get: 0.45 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 0.45 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 0.45 (Double)
In Direct way, get: 0.45 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 0.45 (Double)
---------- ---------- ---------- ----------
String: -.1
In StringTool way, get: -0.1 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -0.1 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -0.1 (Double)
In Direct way, get: -0.1 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -0.1 (Double)
---------- ---------- ---------- ----------
String: null
In StringTool way, get: null (null)
In SimpleJavaLib way, get EXCEPTION: java.lang.NullPointerException
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NullPointerException
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 0x3AFF0
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 042
In StringTool way, get: 42 (Integer)
In SimpleJavaLib way, get: 42 (Long)
In JavaLib way, get: 42 (Integer)
In SimpleRegex way, get: 42 (Long)
In WholeRegex way, get: 42 (Integer)
In Direct way, get: 42 (Integer)
In CharAscii way, get: 42 (Long)
In SimpleApacheUtils way, get: 42 (Long)
In WholeApacheUtils way, get: 42 (Integer)
---------- ---------- ---------- ----------
String: Spads
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
In SimpleJavaLib way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In JavaLib way, get: null (null)
In SimpleRegex way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 5 - 3
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 三十八
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 39501.50
In StringTool way, get: 39501.5 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 39501.5 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 39501.5 (Double)
In Direct way, get: 39501.5 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 39501.5 (Double)
---------- ---------- ---------- ----------
String: 0.
In StringTool way, get: 3.85427E-4 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 3.85427E-4 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 3.85427E-4 (Double)
In Direct way, get: 3.85427E-4 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 3.85427E-4 (Double)
---------- ---------- ---------- ----------
In StringTool way, get: 0. (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 0. (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 0. (Double)
In Direct way, get: 0. (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 0. (Double)
---------- ---------- ---------- ----------
In StringTool way, get:
In SimpleJavaLib way, get:
In JavaLib way, get:
In SimpleRegex way, get:
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get:
In SimpleApacheUtils way, get:
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: 300
In StringTool way, get:
In SimpleJavaLib way, get: null (null)
In JavaLib way, get:
In SimpleRegex way, get: null (null)
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "300 "
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: -570
In StringTool way, get: - (Long)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: - (Long)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: - (Long)
In Direct way, get: - (Long)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: - (Long)
---------- ---------- ---------- ----------
String: -5
In StringTool way, get: -5 (Long)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -5 (Long)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -5 (Long)
In Direct way, get: -5 (Long)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -5 (Long)
---------- ---------- ---------- ----------
In StringTool way, get:
In SimpleJavaLib way, get: null (null)
In JavaLib way, get:
In SimpleRegex way, get: null (null)
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: 2015773
In StringTool way, get: 2015773 (Integer)
In SimpleJavaLib way, get: 2015773 (Long)
In JavaLib way, get: 2015773 (Integer)
In SimpleRegex way, get: 2015773 (Long)
In WholeRegex way, get: 2015773 (Integer)
In Direct way, get: 2015773 (Integer)
In CharAscii way, get: 2015773 (Long)
In SimpleApacheUtils way, get: 2015773 (Long)
In WholeApacheUtils way, get: 2015773 (Integer)
---------- ---------- ---------- ----------
String: 3850
In StringTool way, get: 3850 (Integer)
In SimpleJavaLib way, get: 3850 (Long)
In JavaLib way, get: 3850 (Integer)
In SimpleRegex way, get: 3850 (Long)
In WholeRegex way, get: 3850 (Integer)
In Direct way, get: 3850 (Integer)
In CharAscii way, get: 3850 (Long)
In SimpleApacheUtils way, get: 3850 (Long)
In WholeApacheUtils way, get: 3850 (Integer)
---------- ---------- ---------- ----------
String: -80058
In StringTool way, get: -80058 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -80058 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -80058 (Integer)
In Direct way, get: -80058 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -80058 (Integer)
---------- ---------- ---------- ----------
String: -1
In StringTool way, get: - (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: - (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: - (Integer)
In Direct way, get: - (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: - (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 3 (Integer)
In SimpleJavaLib way, get: 3 (Long)
In JavaLib way, get: 3 (Integer)
In SimpleRegex way, get: 3 (Long)
In WholeRegex way, get: 3 (Integer)
In Direct way, get: 3 (Integer)
In CharAscii way, get: 3 (Long)
In SimpleApacheUtils way, get: 3 (Long)
In WholeApacheUtils way, get: 3 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 0 (Integer)
In SimpleJavaLib way, get: 0 (Long)
In JavaLib way, get: 0 (Integer)
In SimpleRegex way, get: 0 (Long)
In WholeRegex way, get: 0 (Integer)
In Direct way, get: 0 (Integer)
In CharAscii way, get: 0 (Long)
In SimpleApacheUtils way, get: 0 (Long)
In WholeApacheUtils way, get: 0 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: -5.308E32 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -5.308E32 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -5.308E32 (Double)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -5.308E32 (Double)
---------- ---------- ---------- ----------
String: 78 52
In StringTool way, get: 7.296E21 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 7.296E21 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 7.296E21 (Double)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "78 52 "
In WholeApacheUtils way, get: 7.296E21 (Double)
---------- ---------- ---------- ----------
String: 94
In StringTool way, get: 1.711E37 (Double)
In SimpleJavaLib way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In JavaLib way, get: 1.711E37 (Double)
In SimpleRegex way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In WholeRegex way, get: 1.711E37 (Double)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In WholeApacheUtils way, get: 1.711E37 (Double)
---------- ---------- ---------- ----------
4 【性能】---------- ---------- ---------- ----------根据功能测试，我们可以看到，各种简易方法都不能满足需要。接下来对几种能够满足需要的“完整”方法来进行性能测评对比。测试程序通过多线程，每个线程执行一种方案若干次，来直观地表现各种方法的快慢。这种测试被重复了七轮，基本消除了线程调度起伏带来的影响。每轮执行的时间都收录并累加，作为最终评判各方法性能的依据。线程控制使用了原子操作类。测试代码如下。public void testFetchNumberPerformance()
List&SortedMap&Long, String&& timeUsed =
new ArrayList&SortedMap&Long, String&&(this.numStrs.length);
System.out.println("Loop times = " + this.loopNum);
System.out.println("---------- ---------- ---------- ----------");
for (final String numStr: this.numStrs)
final Map&String, Long& timeUsedCount =
Collections.synchronizedMap(new HashMap&String, Long&());
System.out.println("String: " + numStr);
for (int loop = -1; ++loop != 7; )
final AtomicInteger runThreadNum = new AtomicInteger(0);
// StringTool
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("StringTool") == null)
timeUsedCount.put("StringTool", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { StringTool.parseNumber(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\ttool:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("StringTool");
timeUsedCount.put("StringTool", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// JavaLib
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("JavaLib") == null)
timeUsedCount.put("JavaLib", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByJavaLib(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\tlib:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("JavaLib");
timeUsedCount.put("JavaLib", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// WholeRegex
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("WholeRegex") == null)
timeUsedCount.put("WholeRegex", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByRegex(numStr, false); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\treg:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("WholeRegex");
timeUsedCount.put("WholeRegex", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("Direct") == null)
timeUsedCount.put("Direct", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByDirect(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\t--:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("Direct");
timeUsedCount.put("Direct", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// WholeApacheUtils
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("WholeApacheUtils") == null)
timeUsedCount.put("WholeApacheUtils", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByApacheUtils(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\tap:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("WholeApacheUtils");
timeUsedCount.put("WholeApacheUtils", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
while (runThreadNum.get() != 0)
try { Thread.sleep(10); } catch (Exception ex) { }
Thread.yield();
for (int index = -1; ++index != 3; )
try { Thread.sleep(100); } catch (Exception ex) { }
Thread.yield();
System.out.println();
SortedMap&Long, String& thisNumStrTimeUsed =
Collections.synchronizedSortedMap(new TreeMap&Long, String&());
for (String name: timeUsedCount.keySet())
thisNumStrTimeUsed.put(timeUsedCount.get(name), name);
timeUsed.add(thisNumStrTimeUsed);
for (Long time: thisNumStrTimeUsed.keySet())
System.out.println(thisNumStrTimeUsed.get(time) + ": " + time + " ms.");
System.out.println("---------- ---------- ---------- ----------");
每种方法循环量 loopNum 设为
，各种情况性能表现如下。Performance test...
Loop times =
---------- ---------- ---------- ----------
String: 15
tool:1201ms. --:1810ms. ap:2014ms. lib:3058ms. reg:5508ms.
tool:982ms. --:1577ms. ap:1780ms. lib:2746ms. reg:5166ms.
tool:967ms. --:1577ms. ap:1812ms. lib:2810ms. reg:5136ms.
tool:983ms. --:1498ms. ap:1779ms. lib:2590ms. reg:5009ms.
tool:920ms. --:1452ms. ap:1701ms. lib:2590ms. reg:5118ms.
tool:998ms. --:1514ms. ap:1795ms. lib:2668ms. reg:5165ms.
tool:998ms. --:1545ms. ap:1764ms. lib:2700ms. reg:5088ms.
StringTool: 7049 ms.
Direct: 10973 ms.
WholeApacheUtils: 12645 ms.
JavaLib: 19162 ms.
WholeRegex: 36190 ms.
---------- ---------- ---------- ----------
tool:1154ms. --:1654ms. ap:1966ms. lib:2684ms. reg:5353ms.
tool:1123ms. --:1670ms. ap:1889ms. lib:2762ms. reg:5259ms.
tool:1139ms. --:1764ms. ap:1889ms. lib:2747ms. reg:5460ms.
tool:1168ms. --:1715ms. ap:1996ms. lib:2776ms. reg:5413ms.
tool:1092ms. --:1842ms. ap:1842ms. lib:2794ms. reg:5447ms.
tool:1170ms. --:1655ms. ap:1998ms. lib:2793ms. reg:5415ms.
tool:1170ms. --:1671ms. ap:1858ms. lib:2685ms. reg:5338ms.
StringTool: 8016 ms.
Direct: 11971 ms.
WholeApacheUtils: 13438 ms.
JavaLib: 19241 ms.
WholeRegex: 37685 ms.
---------- ---------- ---------- ----------
String: 3.8
tool:2121ms. --:2793ms. ap:3885ms. lib:4775ms. reg:7942ms.
tool:2075ms. --:2778ms. ap:3808ms. lib:4760ms. reg:7724ms.
tool:2137ms. --:2840ms. ap:4135ms. lib:5230ms. reg:8803ms.
tool:2044ms. --:2606ms. ap:3480ms. lib:4713ms. reg:7959ms.
tool:2013ms. --:2451ms. ap:3620ms. lib:4760ms. reg:8193ms.
tool:1856ms. --:2777ms. ap:4150ms. lib:5009ms. reg:8223ms.
tool:1872ms. --:2403ms. ap:3729ms. lib:4887ms. reg:8382ms.
StringTool: 14118 ms.
Direct: 18648 ms.
WholeApacheUtils: 26807 ms.
JavaLib: 34134 ms.
WholeRegex: 57226 ms.
---------- ---------- ---------- ----------
String: -99
tool:1186ms. --:1780ms. ap:2248ms. lib:3325ms. reg:6649ms.
tool:1108ms. --:1826ms. ap:2107ms. lib:2981ms. reg:6102ms.
tool:1139ms. --:1717ms. ap:2170ms. lib:3247ms. reg:6446ms.
tool:1154ms. --:1701ms. ap:1998ms. lib:3074ms. reg:6039ms.
tool:1139ms. --:1686ms. ap:2029ms. lib:3199ms. reg:6508ms.
tool:1123ms. --:1655ms. ap:1920ms. lib:2902ms. reg:5914ms.
tool:1154ms. --:1748ms. ap:2123ms. lib:3215ms. reg:6773ms.
StringTool: 8003 ms.
Direct: 12113 ms.
WholeApacheUtils: 14595 ms.
JavaLib: 21943 ms.
WholeRegex: 44431 ms.
---------- ---------- ---------- ----------
String: .45
tool:1763ms. --:2435ms. ap:3777ms. lib:4651ms. reg:7662ms.
tool:1888ms. --:2263ms. ap:3823ms. lib:4963ms. reg:8131ms.
tool:2153ms. --:2965ms. ap:4182ms. lib:5321ms. reg:8271ms.
tool:1903ms. --:2513ms. ap:3667ms. lib:4713ms. reg:8130ms.
tool:2075ms. --:2684ms. ap:3948ms. lib:5041ms. reg:8396ms.
tool:2231ms. --:2809ms. ap:3995ms. lib:5041ms. reg:8208ms.
tool:2230ms. --:3183ms. ap:4197ms. lib:5306ms. reg:8193ms.
StringTool: 14243 ms.
Direct: 18852 ms.
WholeApacheUtils: 27589 ms.
JavaLib: 35036 ms.
WholeRegex: 56991 ms.
---------- ---------- ---------- ----------
String: -.1
tool:1825ms. --:2434ms. ap:4088ms. lib:4963ms. reg:7661ms.
tool:2481ms. --:3028ms. ap:4525ms. lib:5665ms. reg:8084ms.
tool:2153ms. --:2529ms. ap:4338ms. lib:5072ms. reg:7131ms.
tool:2308ms. --:3292ms. ap:4322ms. lib:5446ms. reg:8224ms.
tool:2543ms. --:2918ms. ap:4385ms. lib:5415ms. reg:8209ms.
tool:2418ms. --:3012ms. ap:4213ms. lib:5446ms. reg:7959ms.
tool:2247ms. --:2700ms. ap:3745ms. lib:4823ms. reg:7554ms.
StringTool: 15975 ms.
Direct: 19913 ms.
WholeApacheUtils: 29616 ms.
JavaLib: 36830 ms.
WholeRegex: 54822 ms.
---------- ---------- ---------- ----------
String: null
--:47ms. tool:125ms. lib:140ms. reg:156ms. ap:156ms.
--:31ms. lib:94ms. tool:94ms. ap:78ms. reg:125ms.
--:16ms. ap:95ms. tool:95ms. reg:126ms. lib:126ms.
--:31ms. lib:94ms. tool:94ms. ap:94ms. reg:109ms.
--:47ms. reg:94ms. lib:94ms. tool:94ms. ap:94ms.
--:47ms. lib:94ms. reg:110ms. ap:63ms. tool:125ms.
--:15ms. reg:78ms. tool:78ms. lib:110ms. ap:110ms.
Direct: 234 ms.
WholeApacheUtils: 690 ms.
StringTool: 705 ms.
JavaLib: 752 ms.
WholeRegex: 798 ms.
---------- ---------- ---------- ----------
String: 0x3AFF0
tool:406ms. ap:579ms. lib:1608ms. reg:4760ms. --:18146ms.
tool:359ms. ap:578ms. lib:1763ms. reg:5180ms. --:17146ms.
tool:328ms. ap:530ms. lib:1685ms. reg:4775ms. --:17303ms.
tool:390ms. ap:562ms. lib:1607ms. reg:5009ms. --:15977ms.
tool:359ms. ap:546ms. lib:1700ms. reg:4728ms. --:18519ms.
tool:437ms. ap:702ms. lib:2107ms. reg:5494ms. --:16086ms.
tool:374ms. ap:515ms. lib:1653ms. reg:5055ms. --:17224ms.
StringTool: 2653 ms.
WholeApacheUtils: 4012 ms.
JavaLib: 12123 ms.
WholeRegex: 35001 ms.
Direct: 120401 ms.
---------- ---------- ---------- ----------
String: 042
tool:1170ms. --:1795ms. ap:2014ms. lib:2934ms. reg:7100ms.
tool:1482ms. --:2154ms. ap:2481ms. lib:3559ms. reg:7788ms.
tool:1373ms. --:2029ms. ap:2154ms. lib:3261ms. reg:7381ms.
tool:1279ms. --:1935ms. ap:2201ms. lib:3339ms. reg:7459ms.
tool:1279ms. --:1936ms. ap:2294ms. lib:3450ms. reg:7507ms.
tool:1373ms. --:1826ms. ap:2122ms. lib:3402ms. reg:7583ms.
tool:1513ms. --:2356ms. ap:2529ms. lib:3668ms. reg:7912ms.
StringTool: 9469 ms.
Direct: 14031 ms.
WholeApacheUtils: 15795 ms.
JavaLib: 23613 ms.
WholeRegex: 52730 ms.
---------- ---------- ---------- ----------
String: Spads
tool:374ms. ap:577ms. lib:1825ms. reg:3480ms. --:15945ms.
tool:281ms. ap:405ms. lib:1545ms. reg:3090ms. --:15930ms.
tool:343ms. ap:655ms. lib:1716ms. reg:3324ms. --:16023ms.
tool:265ms. ap:546ms. lib:1450ms. reg:3136ms. --:16148ms.
tool:296ms. ap:452ms. lib:1482ms. reg:3012ms. --:18254ms.
tool:297ms. ap:468ms. lib:1514ms. reg:2903ms. --:17131ms.
tool:297ms. ap:484ms. lib:1482ms. reg:2981ms. --:15072ms.
StringTool: 2153 ms.
WholeApacheUtils: 3587 ms.
JavaLib: 11014 ms.
WholeRegex: 21926 ms.
Direct: 114503 ms.
---------- ---------- ---------- ----------
tool:93ms. lib:125ms. ap:110ms. reg:2231ms. --:16334ms.
tool:125ms. lib:156ms. ap:140ms. reg:2683ms. --:15539ms.
tool:156ms. lib:172ms. ap:156ms. reg:2746ms. --:15570ms.
tool:125ms. ap:140ms. lib:172ms. reg:2418ms. --:16272ms.
tool:125ms. lib:125ms. ap:141ms. reg:2153ms. --:14431ms.
lib:140ms. tool:140ms. ap:125ms. reg:2589ms. --:18627ms.
tool:141ms. ap:156ms. lib:172ms. reg:2777ms. --:17909ms.
StringTool: 905 ms.
WholeApacheUtils: 968 ms.
JavaLib: 1062 ms.
WholeRegex: 17597 ms.
Direct: 114682 ms.
---------- ---------- ---------- ----------
lib:405ms. tool:421ms. ap:406ms. reg:2854ms. --:18175ms.
tool:452ms. ap:468ms. lib:530ms. reg:3182ms. --:18833ms.
lib:499ms. tool:499ms. ap:530ms. reg:2964ms. --:15086ms.
lib:406ms. tool:421ms. ap:405ms. reg:2683ms. --:17005ms.
ap:375ms. tool:421ms. lib:453ms. reg:3089ms. --:18752ms.
tool:514ms. lib:500ms. ap:546ms. reg:3151ms. --:17254ms.
lib:484ms. tool:484ms. ap:546ms. reg:3183ms. --:14962ms.
StringTool: 3212 ms.
WholeApacheUtils: 3276 ms.
JavaLib: 3277 ms.
WholeRegex: 21106 ms.
Direct: 120067 ms.
---------- ---------- ---------- ----------
String: 5 - 3
tool:530ms. ap:905ms. lib:1904ms. reg:8487ms. --:17490ms.
tool:484ms. ap:733ms. lib:1483ms. reg:7583ms. --:18051ms.
tool:514ms. ap:686ms. lib:1467ms. reg:7707ms. --:18285ms.
tool:640ms. ap:905ms. lib:1904ms. reg:8519ms. --:17474ms.
tool:437ms. ap:702ms. lib:1546ms. reg:7942ms. --:16881ms.
tool:453ms. ap:702ms. lib:1546ms. reg:8332ms. --:18941ms.
tool:593ms. ap:749ms. lib:1857ms. reg:8582ms. --:17335ms.
StringTool: 3651 ms.
WholeApacheUtils: 5382 ms.
JavaLib: 11707 ms.
WholeRegex: 57152 ms.
Direct: 124457 ms.
---------- ---------- ---------- ----------
String: 三十八
tool:328ms. ap:655ms. lib:1857ms. reg:3449ms. --:17537ms.
tool:265ms. ap:483ms. lib:1466ms. reg:2731ms. --:18020ms.
tool:265ms. ap:593ms. lib:1685ms. reg:3230ms. --:16101ms.
tool:265ms. ap:468ms. lib:1420ms. reg:2981ms. --:17287ms.
tool:328ms. ap:546ms. lib:1591ms. reg:3137ms. --:17318ms.
tool:390ms. ap:624ms. lib:1685ms. reg:3012ms. --:17568ms.
tool:265ms. ap:515ms. lib:1513ms. reg:2996ms. --:18005ms.
StringTool: 2106 ms.
WholeApacheUtils: 3884 ms.
JavaLib: 11217 ms.
WholeRegex: 21536 ms.
Direct: 121836 ms.
---------- ---------- ---------- ----------
String: 3.8
tool:1248ms. ap:1951ms. lib:3558ms. --:21202ms. reg:46397ms.
tool:1092ms. ap:1873ms. lib:3245ms. --:20578ms. reg:44931ms.
tool:1310ms. ap:2247ms. lib:3963ms. --:22497ms. reg:46475ms.
tool:1154ms. ap:2013ms. lib:3791ms. --:21280ms. reg:46428ms.
tool:1186ms. ap:1951ms. lib:3371ms. --:22139ms. reg:49457ms.
tool:1404ms. ap:2310ms. lib:3776ms. --:21233ms. reg:46881ms.
tool:1108ms. ap:1889ms. lib:3277ms. --:20968ms. reg:43433ms.
StringTool: 8502 ms.
WholeApacheUtils: 14234 ms.
JavaLib: 24981 ms.
Direct: 149897 ms.
WholeRegex: 324002 ms.
---------- ---------- ---------- ----------
String: 39501.50
tool:3744ms. --:4088ms. ap:5929ms. lib:7318ms. reg:15728ms.
tool:3728ms. --:4353ms. ap:5835ms. lib:7240ms. reg:14511ms.
tool:3292ms. --:4104ms. ap:5914ms. lib:7225ms. reg:15166ms.
tool:3198ms. --:3994ms. ap:5773ms. lib:6991ms. reg:15775ms.
tool:3417ms. --:3698ms. ap:5633ms. lib:7038ms. reg:15198ms.
tool:3260ms. --:4151ms. ap:6132ms. lib:7474ms. reg:15993ms.
tool:3214ms. --:3620ms. ap:5399ms. lib:6788ms. reg:15603ms.
StringTool: 23853 ms.
Direct: 28008 ms.
WholeApacheUtils: 40615 ms.
JavaLib: 50074 ms.
WholeRegex: 107974 ms.
---------- ---------- ---------- ----------
String: 0.
tool:4228ms. --:4603ms. ap:6444ms. lib:8177ms. reg:17944ms.
tool:4087ms. --:4431ms. ap:6678ms. lib:8301ms. reg:17834ms.
tool:3775ms. --:4306ms. ap:6241ms. lib:7849ms. reg:18801ms.
tool:3994ms. --:4307ms. ap:6709ms. lib:7771ms. reg:19269ms.
tool:3526ms. --:4307ms. ap:6053ms. lib:7693ms. reg:18177ms.
tool:3884ms. --:4073ms. ap:6381ms. lib:7880ms. reg:19269ms.
tool:3447ms. --:3760ms. ap:5711ms. lib:7225ms. reg:17959ms.
StringTool: 26941 ms.
Direct: 29787 ms.
WholeApacheUtils: 44217 ms.
JavaLib: 54896 ms.
WholeRegex: 129253 ms.
---------- ---------- ---------- ----------
tool:3525ms. --:3916ms. ap:5648ms. lib:6928ms. reg:15712ms.
tool:3292ms. --:3745ms. ap:5711ms. lib:7178ms. reg:15556ms.
tool:3775ms. --:4119ms. ap:6007ms. lib:7287ms. reg:16071ms.
tool:3463ms. --:3823ms. ap:5601ms. lib:7069ms. reg:14246ms.
tool:3401ms. --:4026ms. ap:5991ms. lib:7162ms. reg:15884ms.
tool:3806ms. --:4291ms. ap:5898ms. lib:7396ms. reg:15915ms.
tool:3884ms. --:4088ms. ap:5960ms. lib:7553ms. reg:15946ms.
StringTool: 25146 ms.
Direct: 28008 ms.
WholeApacheUtils: 40816 ms.
JavaLib: 50573 ms.
WholeRegex: 109330 ms.
---------- ---------- ---------- ----------
tool:3213ms. --:4322ms. ap:4869ms. lib:6522ms. reg:16897ms.
tool:3354ms. --:4010ms. ap:4899ms. lib:6647ms. reg:18614ms.
tool:3260ms. --:3792ms. ap:4463ms. lib:6117ms. reg:17178ms.
tool:3276ms. --:3776ms. ap:4696ms. lib:6444ms. reg:17678ms.
tool:3057ms. --:3838ms. ap:4853ms. lib:6382ms. reg:17351ms.
tool:3448ms. --:4197ms. ap:5040ms. lib:6492ms. reg:18489ms.
tool:3588ms. --:4322ms. ap:5727ms. lib:7880ms. reg:20377ms.
StringTool: 23196 ms.
Direct: 28257 ms.
WholeApacheUtils: 34547 ms.
JavaLib: 46484 ms.
WholeRegex: 126584 ms.
---------- ---------- ---------- ----------
String: 300
tool:3432ms. --:3855ms. ap:5134ms. lib:6476ms. reg:18739ms.
tool:3604ms. --:3963ms. ap:5055ms. lib:6367ms. reg:19409ms.
tool:3432ms. --:3526ms. ap:4822ms. lib:5945ms. reg:18754ms.
tool:2683ms. --:3371ms. ap:4712ms. lib:6258ms. reg:18239ms.
tool:3198ms. --:3604ms. ap:4900ms. lib:6132ms. reg:19472ms.
tool:3213ms. --:3620ms. ap:4790ms. lib:6133ms. reg:17444ms.
tool:3135ms. --:3823ms. ap:5367ms. lib:6679ms. reg:18941ms.
StringTool: 22697 ms.
Direct: 25762 ms.
WholeApacheUtils: 34780 ms.
JavaLib: 43990 ms.
WholeRegex: 130998 ms.
---------- ---------- ---------- ----------
String: -570
tool:3323ms. --:3527ms. ap:5290ms. lib:6508ms. reg:18911ms.
--:3588ms. tool:3667ms. ap:5273ms. lib:6554ms. reg:18224ms.
tool:3588ms. --:4072ms. ap:5071ms. lib:6616ms. reg:18926ms.
tool:3697ms. --:3948ms. ap:5196ms. lib:6304ms. reg:18910ms.
tool:3698ms. --:4135ms. ap:5086ms. lib:6632ms. reg:17382ms.
tool:3760ms. --:3932ms. ap:5445ms. lib:6726ms. reg:19612ms.
tool:3448ms. --:3776ms. ap:5103ms. lib:6227ms. reg:18365ms.
StringTool: 25181 ms.
Direct: 26978 ms.
WholeApacheUtils: 36464 ms.
JavaLib: 45567 ms.
WholeRegex: 130330 ms.
---------- ---------- ---------- ----------
String: -5
tool:3354ms. --:4041ms. ap:5243ms. lib:6897ms. reg:18660ms.
tool:3338ms. --:3886ms. ap:5086ms. lib:7068ms. reg:19347ms.
tool:3978ms. --:3962ms. ap:5414ms. lib:7006ms. reg:18848ms.
tool:3884ms. --:4525ms. ap:5352ms. lib:6928ms. reg:18551ms.
tool:3962ms. --:4525ms. ap:5508ms. lib:6959ms. reg:19159ms.
tool:4196ms. --:4306ms. ap:5164ms. lib:7161ms. reg:19018ms.
tool:3931ms. --:3979ms. ap:5118ms. lib:6913ms. reg:17943ms.
StringTool: 26643 ms.
Direct: 29224 ms.
WholeApacheUtils: 36885 ms.
JavaLib: 48932 ms.
WholeRegex: 131526 ms.
---------- ---------- ---------- ----------
tool:2262ms. --:2825ms. ap:3621ms. lib:5041ms. reg:13778ms.
tool:2559ms. --:3184ms. ap:4010ms. lib:5213ms. reg:15432ms.
tool:2434ms. --:3199ms. ap:4057ms. lib:5259ms. reg:14028ms.
tool:2153ms. --:2778ms. ap:3964ms. lib:5228ms. reg:13778ms.
tool:2480ms. --:2965ms. ap:3979ms. lib:4947ms. reg:15009ms.
tool:2309ms. --:2918ms. ap:3761ms. lib:4916ms. reg:13872ms.
tool:2465ms. --:2965ms. ap:3714ms. lib:5041ms. reg:14760ms.
StringTool: 16662 ms.
Direct: 20834 ms.
WholeApacheUtils: 27106 ms.
JavaLib: 35645 ms.
WholeRegex: 100657 ms.
---------- ---------- ---------- ----------
String: 2015773
tool:1872ms. --:2341ms. ap:3012ms. lib:4463ms. reg:11422ms.
tool:2387ms. --:3449ms. ap:3466ms. lib:4854ms. reg:11641ms.
tool:1919ms. --:2840ms. ap:3121ms. lib:4401ms. reg:12264ms.
tool:1685ms. --:2325ms. ap:2934ms. lib:4635ms. reg:12030ms.
tool:2012ms. --:2497ms. ap:3214ms. lib:4666ms. reg:11172ms.
tool:2184ms. --:3043ms. ap:3495ms. lib:4854ms. reg:12780ms.
tool:2496ms. --:3152ms. ap:3667ms. lib:4932ms. reg:13076ms.
StringTool: 14555 ms.
Direct: 19647 ms.
WholeApacheUtils: 22909 ms.
JavaLib: 32805 ms.
WholeRegex: 84385 ms.
---------- ---------- ---------- ----------
String: 3850
tool:1778ms. --:2653ms. ap:3137ms. lib:4401ms. reg:9878ms.
tool:1669ms. --:2466ms. ap:2824ms. lib:4105ms. reg:8739ms.
tool:1326ms. --:2107ms. ap:2513ms. lib:3621ms. reg:8817ms.
tool:1794ms. --:2501ms. ap:2844ms. lib:4000ms. reg:8603ms.
tool:1326ms. --:1904ms. ap:2326ms. lib:3527ms. reg:8957ms.
tool:1731ms. --:2342ms. ap:2810ms. lib:4059ms. reg:9116ms.
tool:1623ms. --:2560ms. ap:2746ms. lib:3840ms. reg:9364ms.
StringTool: 11247 ms.
Direct: 16533 ms.
WholeApacheUtils: 19200 ms.
JavaLib: 27553 ms.
WholeRegex: 63474 ms.
---------- ---------- ---------- ----------
String: -80058
tool:2199ms. --:2871ms. ap:3370ms. lib:4510ms. reg:9768ms.
tool:1809ms. --:2232ms. ap:2809ms. lib:4337ms. reg:10516ms.
tool:2200ms. --:2669ms. ap:3371ms. lib:4433ms. reg:10611ms.
tool:1779ms. --:2326ms. ap:2684ms. lib:3761ms. reg:9643ms.
tool:2106ms. --:2809ms. ap:3370ms. lib:4729ms. reg:10424ms.
tool:1654ms. --:2326ms. ap:3215ms. lib:4651ms. reg:10362ms.
tool:1716ms. --:1966ms. ap:2762ms. lib:4261ms. reg:10393ms.
StringTool: 13463 ms.
Direct: 17199 ms.
WholeApacheUtils: 21581 ms.
JavaLib: 30682 ms.
WholeRegex: 71717 ms.
---------- ---------- ---------- ----------
String: -1
tool:3073ms. --:3370ms. ap:4525ms. lib:5633ms. reg:17475ms.
tool:2558ms. --:3027ms. ap:4634ms. lib:5556ms. reg:16101ms.
tool:3292ms. --:3590ms. ap:4478ms. lib:5915ms. reg:16009ms.
tool:2762ms. --:2918ms. ap:4728ms. lib:5821ms. reg:16727ms.
tool:2730ms. --:2996ms. ap:4650ms. lib:5758ms. reg:16102ms.
tool:2949ms. --:3386ms. ap:4354ms. lib:5743ms. reg:15447ms.
tool:2762ms. --:3792ms. ap:5634ms. lib:6743ms. reg:16696ms.
StringTool: 20126 ms.
Direct: 23079 ms.
WholeApacheUtils: 33003 ms.
JavaLib: 41169 ms.
WholeRegex: 114557 ms.
---------- ---------- ---------- ----------
tool:795ms. --:1483ms. ap:1935ms. lib:2810ms. reg:6179ms.
tool:874ms. --:1733ms. ap:1810ms. lib:2638ms. reg:6102ms.
tool:921ms. --:1733ms. ap:1810ms. lib:2903ms. reg:6476ms.
tool:983ms. --:1717ms. ap:1858ms. lib:2716ms. reg:5978ms.
tool:1030ms. --:1702ms. ap:1764ms. lib:2778ms. reg:6040ms.
tool:842ms. --:1842ms. ap:1904ms. lib:2966ms. reg:6274ms.
tool:858ms. --:1515ms. ap:1655ms. lib:2513ms. reg:5884ms.
StringTool: 6303 ms.
Direct: 11725 ms.
WholeApacheUtils: 12736 ms.
JavaLib: 19324 ms.
WholeRegex: 42933 ms.
---------- ---------- ---------- ----------
tool:967ms. --:1795ms. ap:1966ms. lib:3043ms. reg:6226ms.
tool:921ms. --:1733ms. ap:2014ms. lib:3029ms. reg:6212ms.
tool:764ms. --:1452ms. ap:1608ms. lib:2357ms. reg:5883ms.
tool:921ms. --:1515ms. ap:1701ms. lib:2575ms. reg:6040ms.
tool:764ms. --:1499ms. ap:1576ms. lib:2762ms. reg:5980ms.
tool:811ms. --:1452ms. ap:1671ms. lib:2466ms. reg:5696ms.
tool:842ms. --:1576ms. ap:1733ms. lib:2747ms. reg:6070ms.
StringTool: 5990 ms.
Direct: 11022 ms.
WholeApacheUtils: 12269 ms.
JavaLib: 18979 ms.
WholeRegex: 42107 ms.
---------- ---------- ---------- ----------
tool:24039ms. ap:26162ms. lib:28955ms. --:31283ms. reg:56618ms.
tool:23681ms. ap:25897ms. lib:29876ms. --:31235ms. reg:56960ms.
tool:25194ms. ap:26927ms. --:29237ms. lib:29441ms. reg:57038ms.
tool:24367ms. ap:25367ms. lib:29034ms. --:31250ms. reg:55431ms.
tool:26567ms. ap:28689ms. lib:30859ms. --:34152ms. reg:61110ms.
tool:25225ms. ap:26085ms. lib:29657ms. --:31266ms. reg:58692ms.
tool:25366ms. ap:27332ms. lib:29611ms. --:30813ms. reg:58005ms.
StringTool: 174439 ms.
WholeApacheUtils: 186459 ms.
JavaLib: 207433 ms.
Direct: 219236 ms.
WholeRegex: 403854 ms.
---------- ---------- ---------- ----------
String: 78 52
tool:21731ms. ap:23136ms. lib:23949ms. --:28848ms. reg:47928ms.
tool:20467ms. ap:22403ms. lib:23636ms. --:27942ms. reg:49237ms.
tool:19625ms. ap:22964ms. lib:24385ms. --:27849ms. reg:48177ms.
tool:21653ms. ap:23775ms. lib:24650ms. --:27614ms. reg:49236ms.
tool:20795ms. ap:23073ms. lib:24088ms. --:29283ms. reg:48347ms.
tool:21279ms. ap:23167ms. lib:23761ms. --:29143ms. reg:48925ms.
tool:20795ms. ap:22247ms. lib:24619ms. --:27725ms. reg:48864ms.
StringTool: 146345 ms.
WholeApacheUtils: 160765 ms.
JavaLib: 169088 ms.
Direct: 198404 ms.
WholeRegex: 340714 ms.
---------- ---------- ---------- ----------
String: 94
--:29078ms. tool:47706ms. ap:49001ms. lib:49564ms. reg:80750ms.
--:34102ms. tool:49079ms. ap:49392ms. lib:51841ms. reg:82761ms.
--:28828ms. tool:45677ms. ap:47051ms. lib:49782ms. reg:81139ms.
--:28407ms. tool:45553ms. ap:48003ms. lib:49829ms. reg:79642ms.
--:27175ms. tool:46208ms. ap:47800ms. lib:48956ms. reg:79704ms.
--:34757ms. tool:54679ms. ap:56864ms. lib:57816ms. reg:88221ms.
--:28486ms. tool:47721ms. ap:48892ms. lib:49065ms. reg:81014ms.
Direct: 210833 ms.
StringTool: 336623 ms.
WholeApacheUtils: 347003 ms.
JavaLib: 356853 ms.
WholeRegex: 573231 ms.
---------- ---------- ---------- ----------
我们可以看到，除了 null 以及被转换数字太长的情况（30位数字以上）外，Spads 出品的 StringTool 都有非常明显的速度优势。 null 本身处理速度远远快于其它情况，即便是 StringTool ，也没有耽误多少执行时间。5 【附录】---------- ---------- ---------- ----------Google 搜索 “Java 判断字符串是否为数值”头条 http://www.blogjava.net/Javaphua/archive//122131.html显得方法最多 /blog/666544直转法 /question/无新意 /html/doc//00784.html阿帕奇工具 http://blog.csdn.net/jojoy_828/article/details/2837784比较全 http://blog.csdn.net/bluesuperman/article/details/1840952无新意 /ztf2008/archive//1393744.html无新意 /z/q.htmGoogle 搜索 “Java 从字符串中提取数值”头条 http://blog.csdn.net/wangjinyu501/article/details/7625636无新意 http://bbs.csdn.net/topics/复数，但我这边需求不涉及 /JAVA/2471.htmlGoogle 搜索“Java 字符串转化为数值”http://dongdong/79385CSDN 搜索 “Java 从字符串中提取数值”对于判断为数值后的转换有详细描述 http://blog.csdn.net/wowwow_cai/article/details/4590553同 Google http://blog.csdn.net/wangjinyu501/article/details/7625636本文还发表在我的其它技术日志CSDN ： http://blog.csdn.net/shanelooli/article/details/8432250中国开源社区： http://my.oschina.net/shane1984/blog/9808851CTO ：【综述】 http://shanelooli./0063
【程序】 http://shanelooli./0074
【功能】 http://shanelooli./blog/0356
【性能】甲 http://shanelooli./0417
【性能】乙 http://shanelooli./0418
如果您想提高自己的技术水平，欢迎加入本站官方1号QQ群：&&，&&2号QQ群：，在群里结识技术精英和交流技术^_^
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怎样转换SWF格式变成MP4的视频呀? 谁能给推荐一个软件呀
提问者采纳
转换大师 功能全面的视频转换器，可以将视频转换为AVI （DivX、XviD）DV AVI、MP4（Sony PSP、Apple iPod、iPhone、AppleTV、Archos DVR、Creative Zen、MS Zune）、WMV、3GP、3G2、PSP、MP4、QuickTime（MOV、QT）、SWF、DVD、VOB、VRO、MPEG 1,2、MPG、DAT、VCD、SVCD、ASF、MJPEG、H.263、H.264、Real Video（RM、RMVB）、DVR-MS、MKV等格式。它使用方便，转换速度很快，品质也很高。转换大师 转换质量和速度绝对好，支持将几乎所有视频格式比如：RM/RMVB/VOB/AVI/MPEG/DAT/VCD/SVCD/DVD/ASF/WMV/MOV/QT/MP4/3GP/3GPP2/DV/YUV等视频文件转换为普通MP4机、SONY PSP、PS3、iPod(Video/Touch/Classic/Nano)、iPhone、Apple TV、3GP/3GPP2/MP4手机或DVD影碟机等硬件支持的AVI/MPEG4/3GP/3GPP2/MP4视频格式；更是支持Flash的SWF/FLV文件的导出，同时还允许将多种格式转换为RM和RMVB格式。
其他类似问题
4人觉得有用
swf格式的相关知识
等待您来回答
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随时随地咨询
出门在外也不愁(转）《软件工程的实事与谬论》（二）_java中OutOfMemoryError:PermGen space的程序处置方法_Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献__脚本百事通
稍等，加载中……
^_^请注意，有可能下面的2篇文章才是您想要的内容：
(转）《软件工程的实事与谬论》（二）
java中OutOfMemoryError:PermGen space的程序处置方法
Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献
(转）《软件工程的实事与谬论》（二）
(转）《软件工程的事实与谬论》（二）
没什么可说的，喜欢ctrl_c + ctrl_v.原url: /hydrangea/blog/item/4b826c0ef9cab3c97bcbe1ba.html1.2 工具和技术 事实5：夸大宣传是软件的瘟疫。多数软件工具对于效率和质量的提高幅度仅为5%～35%。但是总有人反复说提高幅度是“数量级”的。 事实6：在学习新工具或者新技术的初期，程序员的工作效率和产品质量都会下降，只有克服了学习曲线之后，才可能得到实质性的收益。只有满足下面两个条件，采用新工具或新技术才有意义：(a)新东西确实有用；(b)要想获得真正的收益，必须耐心等待。 事实7：软件开发者对于工具说的多，评估的少，买的多，用的少。 关于工具和技术，我从来不觉得什么工具或者技术可以对软件的效率和质量有“数量级”的提高，比较赞同书中的观点。比如说，现在使用C#做一些应用软件，就会比使用C++的效率要高一些，并且质量也会有所提高。但是提高的比例，对于不同的人来说，肯定会有很大的差别。尽管并不一定所有的人都持这样的观点，像一些经验非常丰富的C++高手，也许就不这么认为。 人们总是会偏向于使用自己所熟知的工具和技术来解决现有的问题。因为学习曲线的存在，在学习新的工具和技术的初期，工作效率是肯定会下降的，很可能出现很简单的东西，都需要查资料才能解决。但是如果新的技术和工具确实是有用，在对新技术的掌握到一定程度之后，工作效率的提高才会显现出来，而在这之前，必须要有耐心，这个过程可能是1个月、1年甚至更久。 对于事实7，没有什么认识。印象中，我现在的公司也是这样的。买了很多工具，但是实际使用的也就那么几个，相当一部分工具，花钱买了放着睡觉。平时也就是说说，什么工具好用，什么不好用而已。评估就更谈不上了。
java中OutOfMemoryError:PermGen space的程序处置方法
java中OutOfMemoryError:PermGen space的程序处理方法我们的java程序在运行时出现OutOfMemoryError: PermGen space有以下解决办法：
1、尽早释放无用对象的引用。好的办法是使用临时变量的时候，让引用变量在退出活动域后，自动设置为null，暗示垃圾收集器来收集该对象，防止发生内存泄露。
对于仍然有指针指向的实例，jvm就不会回收该资源,因为垃圾回收会将值为null的对象作为垃圾，提高GC回收机制效率；
2、我们的程序里不可避免大量使用字符串处理，避免使用String，应大量使用StringBuffer，每一个String对象都得独立占用内存一块区域；
String str = "aaa";
String str2 = "bbb";
String str3 = str + str2;//假如执行此次之后str ,str2以后再不被调用,那它就会被放在内存中等待Java的gc去回收,程序内过多的出现这样的情况就会报上面的那个错误,建议在使用字符串时能使用StringBuffer就不要用String,这样可以省不少开销；
3、尽量少用静态变量，因为静态变量是全局的，GC不会回收的；
4、避免集中创建对象尤其是大对象，JVM会突然需要大量内存，这时必然会触发GC优化系统内存环境；显示的声明数组空间，而且申请数量还极大。
5、尽量运用对象池技术以提高系统性能；生命周期长的对象拥有生命周期短的对象时容易引发内存泄漏，例如大集合对象拥有大数据量的业务对象的时候，可以考虑分块进行处理，然后解决一块释放一块的策略。
6、不要在经常调用的方法中创建对象，尤其是忌讳在循环中创建对象。可以适当的使用hashtable，vector 创建一组对象容器，然后从容器中去取那些对象，而不用每次new之后又丢弃
7、一般都是发生在开启大型文件或跟数据库一次拿了太多的数据，造成 Out Of Memory Error 的状况，这时就大概要计算一下数据量的最大值是多少，并且设定所需最小及最大的内存空间值。
原文链接：/service/faq/softfaq/jsp/7.html
Spads 出品字符串高效率提取数值方法 Shane 末日圣诞奉献
Spads 出品字符串高效提取数值方法 Shane 末日圣诞奉献Spads 出品，作者 WangXP 与 Shane目录---------- ---------- ---------- ----------1 【综述】2 【程序】3 【功能】4 【性能】5 【附录】1 【综述】---------- ---------- ---------- ----------最近因为继续编写公式处理和 Json - Java 互转组件，所以专门制作、优化了字符串变成数值的工具方法，并在性能上取得了领先于阿帕奇工具和爪哇类库等方式的成就。本方法基本思路是逐字符扫描。目前关于将字符串转为数值，市面上常见的资料，我搜索总结了十几篇吧，大体是重复的，包括这么几种方法。我看过的资料网址收集在附录中。1、通过 Java 系统提供的 Character#isDigit(char) 判断是否为数值，然后转换。2、通过正则表达式判断是否为数值，然后转换。3、直接转换，捕捉异常。4、阿帕奇提供了 isNumeric(String) 和 isNumericSpace(String) 方法用以判断。如果是数值再转换。目前我这边的需求是，需要支持整数、数字间的空格、空白头尾、小数以及直接小数点开头的小数。JavaLib 的 isDigit(char) 只能判断数字，所以需要事先去除空格、首位负号和第一个小数点。正则表达式在转换前需要去除空格直接转换前也需要去除空格阿帕奇工具方法能判断数字和空格，所以需要事先去除首位负号和第一个小数点。Spads 编写程序是直接利用了字符特点，扫描字符串。也可以认为是一种结合了预处理与字符 ASCII 判断的方法。本方法会将能够解析成数值的字符串解析成数值，否则返回 null 。2 【程序】---------- ---------- ---------- ----------Spads 直接编写了适用的程序，经过很长时间性能优化，达到了优于上述所有方法的效果。代码如下。
* &b&抽取字符串的数字值&/b&&br/&
* 本方法用来将传入字符串的内容理解为十进制数值。如果传入字符串的内容无法理解为
* 数值，则返回 &code&null&/code& 。数值字符串是指包括正、负的整数、浮点数；其中
* 允许出现分割用空格，允许直接使用小数点起头以表示 0.x 样的小数。&br/&
* 方法使用示例如下。
* StringTool.fetchNumberValue("15") = 15 (java.lang.Integer)
* StringTool.fetchNumberValue("300 ")
(java.lang.Long)
* StringTool.fetchNumberValue(" 28 ") = 28 (java.lang.Integer)
* StringTool.fetchNumberValue("3.8") = 3.8 (java.lang.Double)
* StringTool.fetchNumberValue("-99") = -99 (java.lang.Integer)
* StringTool.fetchNumberValue("+15") = null
* StringTool.fetchNumberValue(".45") = 0.45 (java.lang.Double)
* StringTool.fetchNumberValue("-.1") = -0.1 (java.lang.Double)
* StringTool.fetchNumberValue("0x3AFF0") = null
* StringTool.fetchNumberValue("042") = 42 (java.lang.Integer)
* StringTool.fetchNumberValue("Spads") = null
* StringTool.fetchNumberValue("") = null
* StringTool.fetchNumberValue(null) = null
* StringTool.fetchNumberValue("5 - 3") = null
* StringTool.fetchNumberValue("3.8") = null
* StringTool.fetchNumberValue("94")
* = 1.711E37 (java.lang.Double)
* 本方法不涉及正则表达式，同时未避免生成异常的巨大系统消耗，通过遍历字符串每
* 一个字符来判断其是否符合十进制数值格式，格式不符则直接返回
* &code&null&/code& 。如果格式符合，浮点数按 {@link Double} 识别，整数按
* {@link Long} 识别。如果数值范围符合 {@link Integer} ，则转换。
StringTool#removeChar(String, char)
numStr 准备提取数值的字符串
传入字符串按十进制理解的数值对象，其类型有可能为
* &code&Long&/code& 、 &code&Integer&/code& 或者 &code&Double&/code&。
* @exception NumberFormatException 当字符串是整数但超过了
* {@link Long#MIN_VALUE} - {@link Long#MAX_VALUE} 范围同时其位数并不大于 20，
* 或者字符串是浮点数 但超过了
* {@link Double#MIN_VALUE} - {@link Double#MAX_VALUE} 范围。
static public Number parseNumber(String numStr)
if (numStr == null || (numStr = numStr.trim()).length() == 0)
final StringBuilder numBuilder = new StringBuilder();
boolean doubleFlag =
final int length = numStr.length();
for (int index = 0; index != index++)
numChar = numStr.charAt(index);
if (numChar & 57)
switch (StringTool.charType[numChar])
// 在之前没有小数点的情况下出现小数点，记录，同时认为此字符串是浮点数
if (doubleFlag || index == length - 1)
doubleFlag =
// 此处通过
// 如果是数字，认为此字符串还是数值，检查下一个字符
case 4: numBuilder.append(numChar);
// 此处通过
// 如果是空格，直接检查下一个字符
// 如果是负号，又不是首位，则按非数值字符串进行返回
if (index == 0)
numBuilder.append(numChar);
// 此处通过
// 如果字符不符合数值格式，方法按非数值字符串进行返回
if (doubleFlag || length & 20)
return Double.valueOf(numBuilder.toString());
// 非浮点数情况，如果数值在整数范围内，则按整数返回。否则按长整数返回。
final long num = Long.parseLong(numBuilder.toString());
final int finalNum = (int)
if (finalNum != num)
return finalN
* &b&字符类型数组&/b&&br/&
* 为字符串抽取数值含义提供的字符类型获取器。通过将字符本身作为此数组下标获取对应
* 类型。类型用整数表示，含义如下。&br/&
* 1 为空白间隔，对应 &code&' '&/code& 和 &code&'\t'&/code&&br/&
* 2 为负号，对应 &code&'-'&/code&&br/&
* 3 为小数点，对应 &code&'.'&/code&&br/&
* 4 为数字，对应 &code&'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'&/code&
static private int[] charType = {
0,0,0,0,0, 0,0,0,0,1,
0,0,0,0,0, 0,0,0,0,0,
0,0,0,0,0, 0,0,0,0,0,
0,0,1,0,0, 0,0,0,0,0,
0,0,0,0,0, 2,3,0,4,4,
4,4,4,4,4, 4,4,4
经过测试，发现本方法可以完美地达到需要的处理效果。以下是测试报告。Function test...
---------- ---------- ---------- ----------
String: 15
In StringTool way, get: 15 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 28 (Integer)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: 3.8 (Double)
---------- ---------- ---------- ----------
String: -99
In StringTool way, get: -99 (Integer)
---------- ---------- ---------- ----------
String: .45
In StringTool way, get: 0.45 (Double)
---------- ---------- ---------- ----------
String: -.1
In StringTool way, get: -0.1 (Double)
---------- ---------- ---------- ----------
String: null
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 0x3AFF0
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 042
In StringTool way, get: 42 (Integer)
---------- ---------- ---------- ----------
String: Spads
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 5 - 3
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 三十八
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: null (null)
---------- ---------- ---------- ----------
String: 39501.50
In StringTool way, get: 39501.5 (Double)
---------- ---------- ---------- ----------
String: 0.
In StringTool way, get: 3.85427E-4 (Double)
---------- ---------- ---------- ----------
In StringTool way, get: 0. (Double)
---------- ---------- ---------- ----------
In StringTool way, get:
---------- ---------- ---------- ----------
String: 300
In StringTool way, get:
---------- ---------- ---------- ----------
String: -570
In StringTool way, get: - (Long)
---------- ---------- ---------- ----------
String: -5
In StringTool way, get: -5 (Long)
---------- ---------- ---------- ----------
In StringTool way, get:
---------- ---------- ---------- ----------
String: 2015773
In StringTool way, get: 2015773 (Integer)
---------- ---------- ---------- ----------
String: 3850
In StringTool way, get: 3850 (Integer)
---------- ---------- ---------- ----------
String: -80058
In StringTool way, get: -80058 (Integer)
---------- ---------- ---------- ----------
String: -1
In StringTool way, get: - (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 3 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 0 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: -5.308E32 (Double)
---------- ---------- ---------- ----------
String: 78 52
In StringTool way, get: 7.296E21 (Double)
---------- ---------- ---------- ----------
String: 94
In StringTool way, get: 1.711E37 (Double)
---------- ---------- ---------- ----------
3 【功能】---------- ---------- ---------- ----------Spads 推出的 parseNumber(String) 方法能够完整地实现解读数值字符串的功能。那么其它几种方法表现如何呢？其它方法的程序代码经过 Shane 认真处理，依然有 200 多行。我就不每行都贴出来了。这里简述一下各种方法所使用的方式。A、简单爪哇类库方法 SimpleJavaLibB、爪哇类库方法 JavaLib核心判断方法private boolean isNumericByJavaLib(CharSequence numSequence)
for (int i = numSequence.length(); --i &= 0; )
if (!Character.isDigit(numSequence.charAt(i)))
SimpleJavaLib 将字符串直接传入此检测方法进行判断，如果检验通过则直接按 Long 类型转换。JavaLib 方法首先给字符串去除空格、首位负号和第一个小数点，然后再传入此检测方法进行判断；如果检验通过则根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。C、简单正则表达式 SimpleRegex用 \d* 来判断，然后按长整数转换。D、完整正则表达式 WholeRegex用 ^[-]?(((\s|\d)*\d(\s|\d)*(\.(\s|\d)*\d(\s|\d)*)?)|(\.(\s|\d)*[1-9](\s|\d)*)) 来判断。如果检验通过则根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。E、直接转换捕捉异常 Direct根据字符串是否含有 '.' 字符，决定用 Double 转换还是用 Long 转换。如果转换发生异常，则返回 null 。如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。F、直接判断字符 CharAsciiprivate Number fetchNumberByCharAscii(String numStr)
for (int i = numStr.length(); --i &= 0; )
int chr = numStr.charAt(i);
if (chr & 48 || chr & 57)
return Long.valueOf(numStr);
G、简单阿帕奇工具方法 SimpleApacheUtils核心判断方法为 mons.lang3.StringUtils.isNumeric(CharSequence)其余部分与 A 类似H、完整阿帕奇工具方法 WholeApacheUtils核心判断方法为 mons.lang3.StringUtils.isNumericSpace(CharSequence)首先给字符串去除首位负号和第一个小数点，然后再传入此检测方法进行判断；如果检验通过则先消除空格，然后根据有无小数点决定用 Long 还是 Double ；如果是 Long ，得到结果之后会试图转换为 int ，已决定是否可以用整形。我设计了这些测试用字符串，以检测各种方法的功能private String[] numStrs = {
"15", "\t28 ", "3.8", "-99", ".45", "-.1", null,
"0x3AFF0", "042", "Spads", "", "
", "5 - 3", "三十八",
"3.8", "39501.50", "0.", ".",
"", "300 ", "-570 ", "-5",
"", "2015773", "3850", "-80058", "-1 ", "3", "0",
"-", "78 52 ",
检测结果如下。Function test...
---------- ---------- ---------- ----------
String: 15
In StringTool way, get: 15 (Integer)
In SimpleJavaLib way, get: 15 (Long)
In JavaLib way, get: 15 (Integer)
In SimpleRegex way, get: 15 (Long)
In WholeRegex way, get: 15 (Integer)
In Direct way, get: 15 (Integer)
In CharAscii way, get: 15 (Long)
In SimpleApacheUtils way, get: 15 (Long)
In WholeApacheUtils way, get: 15 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 28 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 28 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 28 (Integer)
In Direct way, get: 28 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 28 (Integer)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: 3.8 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 3.8 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 3.8 (Double)
In Direct way, get: 3.8 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 3.8 (Double)
---------- ---------- ---------- ----------
String: -99
In StringTool way, get: -99 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -99 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -99 (Integer)
In Direct way, get: -99 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -99 (Integer)
---------- ---------- ---------- ----------
String: .45
In StringTool way, get: 0.45 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 0.45 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 0.45 (Double)
In Direct way, get: 0.45 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 0.45 (Double)
---------- ---------- ---------- ----------
String: -.1
In StringTool way, get: -0.1 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -0.1 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -0.1 (Double)
In Direct way, get: -0.1 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -0.1 (Double)
---------- ---------- ---------- ----------
String: null
In StringTool way, get: null (null)
In SimpleJavaLib way, get EXCEPTION: java.lang.NullPointerException
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NullPointerException
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 0x3AFF0
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 042
In StringTool way, get: 42 (Integer)
In SimpleJavaLib way, get: 42 (Long)
In JavaLib way, get: 42 (Integer)
In SimpleRegex way, get: 42 (Long)
In WholeRegex way, get: 42 (Integer)
In Direct way, get: 42 (Integer)
In CharAscii way, get: 42 (Long)
In SimpleApacheUtils way, get: 42 (Long)
In WholeApacheUtils way, get: 42 (Integer)
---------- ---------- ---------- ----------
String: Spads
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
In SimpleJavaLib way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In JavaLib way, get: null (null)
In SimpleRegex way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 5 - 3
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 三十八
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 3.8
In StringTool way, get: null (null)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: null (null)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: null (null)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: null (null)
---------- ---------- ---------- ----------
String: 39501.50
In StringTool way, get: 39501.5 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 39501.5 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 39501.5 (Double)
In Direct way, get: 39501.5 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 39501.5 (Double)
---------- ---------- ---------- ----------
String: 0.
In StringTool way, get: 3.85427E-4 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 3.85427E-4 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 3.85427E-4 (Double)
In Direct way, get: 3.85427E-4 (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 3.85427E-4 (Double)
---------- ---------- ---------- ----------
In StringTool way, get: 0. (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 0. (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 0. (Double)
In Direct way, get: 0. (Double)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: 0. (Double)
---------- ---------- ---------- ----------
In StringTool way, get:
In SimpleJavaLib way, get:
In JavaLib way, get:
In SimpleRegex way, get:
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get:
In SimpleApacheUtils way, get:
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: 300
In StringTool way, get:
In SimpleJavaLib way, get: null (null)
In JavaLib way, get:
In SimpleRegex way, get: null (null)
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "300 "
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: -570
In StringTool way, get: - (Long)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: - (Long)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: - (Long)
In Direct way, get: - (Long)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: - (Long)
---------- ---------- ---------- ----------
String: -5
In StringTool way, get: -5 (Long)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -5 (Long)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -5 (Long)
In Direct way, get: -5 (Long)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -5 (Long)
---------- ---------- ---------- ----------
In StringTool way, get:
In SimpleJavaLib way, get: null (null)
In JavaLib way, get:
In SimpleRegex way, get: null (null)
In WholeRegex way, get:
In Direct way, get:
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: ""
In WholeApacheUtils way, get:
---------- ---------- ---------- ----------
String: 2015773
In StringTool way, get: 2015773 (Integer)
In SimpleJavaLib way, get: 2015773 (Long)
In JavaLib way, get: 2015773 (Integer)
In SimpleRegex way, get: 2015773 (Long)
In WholeRegex way, get: 2015773 (Integer)
In Direct way, get: 2015773 (Integer)
In CharAscii way, get: 2015773 (Long)
In SimpleApacheUtils way, get: 2015773 (Long)
In WholeApacheUtils way, get: 2015773 (Integer)
---------- ---------- ---------- ----------
String: 3850
In StringTool way, get: 3850 (Integer)
In SimpleJavaLib way, get: 3850 (Long)
In JavaLib way, get: 3850 (Integer)
In SimpleRegex way, get: 3850 (Long)
In WholeRegex way, get: 3850 (Integer)
In Direct way, get: 3850 (Integer)
In CharAscii way, get: 3850 (Long)
In SimpleApacheUtils way, get: 3850 (Long)
In WholeApacheUtils way, get: 3850 (Integer)
---------- ---------- ---------- ----------
String: -80058
In StringTool way, get: -80058 (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -80058 (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -80058 (Integer)
In Direct way, get: -80058 (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -80058 (Integer)
---------- ---------- ---------- ----------
String: -1
In StringTool way, get: - (Integer)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: - (Integer)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: - (Integer)
In Direct way, get: - (Integer)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: - (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 3 (Integer)
In SimpleJavaLib way, get: 3 (Long)
In JavaLib way, get: 3 (Integer)
In SimpleRegex way, get: 3 (Long)
In WholeRegex way, get: 3 (Integer)
In Direct way, get: 3 (Integer)
In CharAscii way, get: 3 (Long)
In SimpleApacheUtils way, get: 3 (Long)
In WholeApacheUtils way, get: 3 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: 0 (Integer)
In SimpleJavaLib way, get: 0 (Long)
In JavaLib way, get: 0 (Integer)
In SimpleRegex way, get: 0 (Long)
In WholeRegex way, get: 0 (Integer)
In Direct way, get: 0 (Integer)
In CharAscii way, get: 0 (Long)
In SimpleApacheUtils way, get: 0 (Long)
In WholeApacheUtils way, get: 0 (Integer)
---------- ---------- ---------- ----------
In StringTool way, get: -5.308E32 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: -5.308E32 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: -5.308E32 (Double)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get: null (null)
In WholeApacheUtils way, get: -5.308E32 (Double)
---------- ---------- ---------- ----------
String: 78 52
In StringTool way, get: 7.296E21 (Double)
In SimpleJavaLib way, get: null (null)
In JavaLib way, get: 7.296E21 (Double)
In SimpleRegex way, get: null (null)
In WholeRegex way, get: 7.296E21 (Double)
In Direct way, get: null (null)
In CharAscii way, get: null (null)
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "78 52 "
In WholeApacheUtils way, get: 7.296E21 (Double)
---------- ---------- ---------- ----------
String: 94
In StringTool way, get: 1.711E37 (Double)
In SimpleJavaLib way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In JavaLib way, get: 1.711E37 (Double)
In SimpleRegex way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In WholeRegex way, get: 1.711E37 (Double)
In Direct way, get: null (null)
In CharAscii way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "94"
In WholeApacheUtils way, get: 1.711E37 (Double)
---------- ---------- ---------- ----------
4 【性能】---------- ---------- ---------- ----------根据功能测试，我们可以看到，各种简易方法都不能满足需要。接下来对几种能够满足需要的“完整”方法来进行性能测评对比。测试程序通过多线程，每个线程执行一种方案若干次，来直观地表现各种方法的快慢。这种测试被重复了七轮，基本消除了线程调度起伏带来的影响。每轮执行的时间都收录并累加，作为最终评判各方法性能的依据。线程控制使用了原子操作类。测试代码如下。public void testFetchNumberPerformance()
List&SortedMap&Long, String&& timeUsed =
new ArrayList&SortedMap&Long, String&&(this.numStrs.length);
System.out.println("Loop times = " + this.loopNum);
System.out.println("---------- ---------- ---------- ----------");
for (final String numStr: this.numStrs)
final Map&String, Long& timeUsedCount =
Collections.synchronizedMap(new HashMap&String, Long&());
System.out.println("String: " + numStr);
for (int loop = -1; ++loop != 7; )
final AtomicInteger runThreadNum = new AtomicInteger(0);
// StringTool
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("StringTool") == null)
timeUsedCount.put("StringTool", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { StringTool.parseNumber(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\ttool:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("StringTool");
timeUsedCount.put("StringTool", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// JavaLib
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("JavaLib") == null)
timeUsedCount.put("JavaLib", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByJavaLib(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\tlib:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("JavaLib");
timeUsedCount.put("JavaLib", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// WholeRegex
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("WholeRegex") == null)
timeUsedCount.put("WholeRegex", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByRegex(numStr, false); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\treg:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("WholeRegex");
timeUsedCount.put("WholeRegex", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("Direct") == null)
timeUsedCount.put("Direct", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByDirect(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\t--:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("Direct");
timeUsedCount.put("Direct", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
// WholeApacheUtils
r = new Runnable()
public void run()
boolean hasEx =
if (timeUsedCount.get("WholeApacheUtils") == null)
timeUsedCount.put("WholeApacheUtils", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopN )
try { FetchNumberTest.this.fetchNumberByApacheUtils(numStr); }
catch (Exception ex) { hasEx = }
long use = System.currentTimeMillis() -
System.out.print("\tap:" + use + "ms" + (hasEx ? "(EX)" : "") + '.');
use += timeUsedCount.get("WholeApacheUtils");
timeUsedCount.put("WholeApacheUtils", use);
runThreadNum.addAndGet(-1);
Thread.yield();
runThreadNum.addAndGet(1);
new Thread(r).start();
while (runThreadNum.get() != 0)
try { Thread.sleep(10); } catch (Exception ex) { }
Thread.yield();
for (int index = -1; ++index != 3; )
try { Thread.sleep(100); } catch (Exception ex) { }
Thread.yield();
System.out.println();
SortedMap&Long, String& thisNumStrTimeUsed =
Collections.synchronizedSortedMap(new TreeMap&Long, String&());
for (String name: timeUsedCount.keySet())
thisNumStrTimeUsed.put(timeUsedCount.get(name), name);
timeUsed.add(thisNumStrTimeUsed);
for (Long time: thisNumStrTimeUsed.keySet())
System.out.println(thisNumStrTimeUsed.get(time) + ": " + time + " ms.");
System.out.println("---------- ---------- ---------- ----------");
每种方法循环量 loopNum 设为
，各种情况性能表现如下。Performance test...
Loop times =
---------- ---------- ---------- ----------
String: 15
tool:1201ms. --:1810ms. ap:2014ms. lib:3058ms. reg:5508ms.
tool:982ms. --:1577ms. ap:1780ms. lib:2746ms. reg:5166ms.
tool:967ms. --:1577ms. ap:1812ms. lib:2810ms. reg:5136ms.
tool:983ms. --:1498ms. ap:1779ms. lib:2590ms. reg:5009ms.
tool:920ms. --:1452ms. ap:1701ms. lib:2590ms. reg:5118ms.
tool:998ms. --:1514ms. ap:1795ms. lib:2668ms. reg:5165ms.
tool:998ms. --:1545ms. ap:1764ms. lib:2700ms. reg:5088ms.
StringTool: 7049 ms.
Direct: 10973 ms.
WholeApacheUtils: 12645 ms.
JavaLib: 19162 ms.
WholeRegex: 36190 ms.
---------- ---------- ---------- ----------
tool:1154ms. --:1654ms. ap:1966ms. lib:2684ms. reg:5353ms.
tool:1123ms. --:1670ms. ap:1889ms. lib:2762ms. reg:5259ms.
tool:1139ms. --:1764ms. ap:1889ms. lib:2747ms. reg:5460ms.
tool:1168ms. --:1715ms. ap:1996ms. lib:2776ms. reg:5413ms.
tool:1092ms. --:1842ms. ap:1842ms. lib:2794ms. reg:5447ms.
tool:1170ms. --:1655ms. ap:1998ms. lib:2793ms. reg:5415ms.
tool:1170ms. --:1671ms. ap:1858ms. lib:2685ms. reg:5338ms.
StringTool: 8016 ms.
Direct: 11971 ms.
WholeApacheUtils: 13438 ms.
JavaLib: 19241 ms.
WholeRegex: 37685 ms.
---------- ---------- ---------- ----------
String: 3.8
tool:2121ms. --:2793ms. ap:3885ms. lib:4775ms. reg:7942ms.
tool:2075ms. --:2778ms. ap:3808ms. lib:4760ms. reg:7724ms.
tool:2137ms. --:2840ms. ap:4135ms. lib:5230ms. reg:8803ms.
tool:2044ms. --:2606ms. ap:3480ms. lib:4713ms. reg:7959ms.
tool:2013ms. --:2451ms. ap:3620ms. lib:4760ms. reg:8193ms.
tool:1856ms. --:2777ms. ap:4150ms. lib:5009ms. reg:8223ms.
tool:1872ms. --:2403ms. ap:3729ms. lib:4887ms. reg:8382ms.
StringTool: 14118 ms.
Direct: 18648 ms.
WholeApacheUtils: 26807 ms.
JavaLib: 34134 ms.
WholeRegex: 57226 ms.
---------- ---------- ---------- ----------
String: -99
tool:1186ms. --:1780ms. ap:2248ms. lib:3325ms. reg:6649ms.
tool:1108ms. --:1826ms. ap:2107ms. lib:2981ms. reg:6102ms.
tool:1139ms. --:1717ms. ap:2170ms. lib:3247ms. reg:6446ms.
tool:1154ms. --:1701ms. ap:1998ms. lib:3074ms. reg:6039ms.
tool:1139ms. --:1686ms. ap:2029ms. lib:3199ms. reg:6508ms.
tool:1123ms. --:1655ms. ap:1920ms. lib:2902ms. reg:5914ms.
tool:1154ms. --:1748ms. ap:2123ms. lib:3215ms. reg:6773ms.
StringTool: 8003 ms.
Direct: 12113 ms.
WholeApacheUtils: 14595 ms.
JavaLib: 21943 ms.
WholeRegex: 44431 ms.
---------- ---------- ---------- ----------
String: .45
tool:1763ms. --:2435ms. ap:3777ms. lib:4651ms. reg:7662ms.
tool:1888ms. --:2263ms. ap:3823ms. lib:4963ms. reg:8131ms.
tool:2153ms. --:2965ms. ap:4182ms. lib:5321ms. reg:8271ms.
tool:1903ms. --:2513ms. ap:3667ms. lib:4713ms. reg:8130ms.
tool:2075ms. --:2684ms. ap:3948ms. lib:5041ms. reg:8396ms.
tool:2231ms. --:2809ms. ap:3995ms. lib:5041ms. reg:8208ms.
tool:2230ms. --:3183ms. ap:4197ms. lib:5306ms. reg:8193ms.
StringTool: 14243 ms.
Direct: 18852 ms.
WholeApacheUtils: 27589 ms.
JavaLib: 35036 ms.
WholeRegex: 56991 ms.
---------- ---------- ---------- ----------
String: -.1
tool:1825ms. --:2434ms. ap:4088ms. lib:4963ms. reg:7661ms.
tool:2481ms. --:3028ms. ap:4525ms. lib:5665ms. reg:8084ms.
tool:2153ms. --:2529ms. ap:4338ms. lib:5072ms. reg:7131ms.
tool:2308ms. --:3292ms. ap:4322ms. lib:5446ms. reg:8224ms.
tool:2543ms. --:2918ms. ap:4385ms. lib:5415ms. reg:8209ms.
tool:2418ms. --:3012ms. ap:4213ms. lib:5446ms. reg:7959ms.
tool:2247ms. --:2700ms. ap:3745ms. lib:4823ms. reg:7554ms.
StringTool: 15975 ms.
Direct: 19913 ms.
WholeApacheUtils: 29616 ms.
JavaLib: 36830 ms.
WholeRegex: 54822 ms.
---------- ---------- ---------- ----------
String: null
--:47ms. tool:125ms. lib:140ms. reg:156ms. ap:156ms.
--:31ms. lib:94ms. tool:94ms. ap:78ms. reg:125ms.
--:16ms. ap:95ms. tool:95ms. reg:126ms. lib:126ms.
--:31ms. lib:94ms. tool:94ms. ap:94ms. reg:109ms.
--:47ms. reg:94ms. lib:94ms. tool:94ms. ap:94ms.
--:47ms. lib:94ms. reg:110ms. ap:63ms. tool:125ms.
--:15ms. reg:78ms. tool:78ms. lib:110ms. ap:110ms.
Direct: 234 ms.
WholeApacheUtils: 690 ms.
StringTool: 705 ms.
JavaLib: 752 ms.
WholeRegex: 798 ms.
---------- ---------- ---------- ----------
String: 0x3AFF0
tool:406ms. ap:579ms. lib:1608ms. reg:4760ms. --:18146ms.
tool:359ms. ap:578ms. lib:1763ms. reg:5180ms. --:17146ms.
tool:328ms. ap:530ms. lib:1685ms. reg:4775ms. --:17303ms.
tool:390ms. ap:562ms. lib:1607ms. reg:5009ms. --:15977ms.
tool:359ms. ap:546ms. lib:1700ms. reg:4728ms. --:18519ms.
tool:437ms. ap:702ms. lib:2107ms. reg:5494ms. --:16086ms.
tool:374ms. ap:515ms. lib:1653ms. reg:5055ms. --:17224ms.
StringTool: 2653 ms.
WholeApacheUtils: 4012 ms.
JavaLib: 12123 ms.
WholeRegex: 35001 ms.
Direct: 120401 ms.
---------- ---------- ---------- ----------
String: 042
tool:1170ms. --:1795ms. ap:2014ms. lib:2934ms. reg:7100ms.
tool:1482ms. --:2154ms. ap:2481ms. lib:3559ms. reg:7788ms.
tool:1373ms. --:2029ms. ap:2154ms. lib:3261ms. reg:7381ms.
tool:1279ms. --:1935ms. ap:2201ms. lib:3339ms. reg:7459ms.
tool:1279ms. --:1936ms. ap:2294ms. lib:3450ms. reg:7507ms.
tool:1373ms. --:1826ms. ap:2122ms. lib:3402ms. reg:7583ms.
tool:1513ms. --:2356ms. ap:2529ms. lib:3668ms. reg:7912ms.
StringTool: 9469 ms.
Direct: 14031 ms.
WholeApacheUtils: 15795 ms.
JavaLib: 23613 ms.
WholeRegex: 52730 ms.
---------- ---------- ---------- ----------
String: Spads
tool:374ms. ap:577ms. lib:1825ms. reg:3480ms. --:15945ms.
tool:281ms. ap:405ms. lib:1545ms. reg:3090ms. --:15930ms.
tool:343ms. ap:655ms. lib:1716ms. reg:3324ms. --:16023ms.
tool:265ms. ap:546ms. lib:1450ms. reg:3136ms. --:16148ms.
tool:296ms. ap:452ms. lib:1482ms. reg:3012ms. --:18254ms.
tool:297ms. ap:468ms. lib:1514ms. reg:2903ms. --:17131ms.
tool:297ms. ap:484ms. lib:1482ms. reg:2981ms. --:15072ms.
StringTool: 2153 ms.
WholeApacheUtils: 3587 ms.
JavaLib: 11014 ms.
WholeRegex: 21926 ms.
Direct: 114503 ms.
---------- ---------- ---------- ----------
tool:93ms. lib:125ms. ap:110ms. reg:2231ms. --:16334ms.
tool:125ms. lib:156ms. ap:140ms. reg:2683ms. --:15539ms.
tool:156ms. lib:172ms. ap:156ms. reg:2746ms. --:15570ms.
tool:125ms. ap:140ms. lib:172ms. reg:2418ms. --:16272ms.
tool:125ms. lib:125ms. ap:141ms. reg:2153ms. --:14431ms.
lib:140ms. tool:140ms. ap:125ms. reg:2589ms. --:18627ms.
tool:141ms. ap:156ms. lib:172ms. reg:2777ms. --:17909ms.
StringTool: 905 ms.
WholeApacheUtils: 968 ms.
JavaLib: 1062 ms.
WholeRegex: 17597 ms.
Direct: 114682 ms.
---------- ---------- ---------- ----------
lib:405ms. tool:421ms. ap:406ms. reg:2854ms. --:18175ms.
tool:452ms. ap:468ms. lib:530ms. reg:3182ms. --:18833ms.
lib:499ms. tool:499ms. ap:530ms. reg:2964ms. --:15086ms.
lib:406ms. tool:421ms. ap:405ms. reg:2683ms. --:17005ms.
ap:375ms. tool:421ms. lib:453ms. reg:3089ms. --:18752ms.
tool:514ms. lib:500ms. ap:546ms. reg:3151ms. --:17254ms.
lib:484ms. tool:484ms. ap:546ms. reg:3183ms. --:14962ms.
StringTool: 3212 ms.
WholeApacheUtils: 3276 ms.
JavaLib: 3277 ms.
WholeRegex: 21106 ms.
Direct: 120067 ms.
---------- ---------- ---------- ----------
String: 5 - 3
tool:530ms. ap:905ms. lib:1904ms. reg:8487ms. --:17490ms.
tool:484ms. ap:733ms. lib:1483ms. reg:7583ms. --:18051ms.
tool:514ms. ap:686ms. lib:1467ms. reg:7707ms. --:18285ms.
tool:640ms. ap:905ms. lib:1904ms. reg:8519ms. --:17474ms.
tool:437ms. ap:702ms. lib:1546ms. reg:7942ms. --:16881ms.
tool:453ms. ap:702ms. lib:1546ms. reg:8332ms. --:18941ms.
tool:593ms. ap:749ms. lib:1857ms. reg:8582ms. --:17335ms.
StringTool: 3651 ms.
WholeApacheUtils: 5382 ms.
JavaLib: 11707 ms.
WholeRegex: 57152 ms.
Direct: 124457 ms.
---------- ---------- ---------- ----------
String: 三十八
tool:328ms. ap:655ms. lib:1857ms. reg:3449ms. --:17537ms.
tool:265ms. ap:483ms. lib:1466ms. reg:2731ms. --:18020ms.
tool:265ms. ap:593ms. lib:1685ms. reg:3230ms. --:16101ms.
tool:265ms. ap:468ms. lib:1420ms. reg:2981ms. --:17287ms.
tool:328ms. ap:546ms. lib:1591ms. reg:3137ms. --:17318ms.
tool:390ms. ap:624ms. lib:1685ms. reg:3012ms. --:17568ms.
tool:265ms. ap:515ms. lib:1513ms. reg:2996ms. --:18005ms.
StringTool: 2106 ms.
WholeApacheUtils: 3884 ms.
JavaLib: 11217 ms.
WholeRegex: 21536 ms.
Direct: 121836 ms.
---------- ---------- ---------- ----------
String: 3.8
tool:1248ms. ap:1951ms. lib:3558ms. --:21202ms. reg:46397ms.
tool:1092ms. ap:1873ms. lib:3245ms. --:20578ms. reg:44931ms.
tool:1310ms. ap:2247ms. lib:3963ms. --:22497ms. reg:46475ms.
tool:1154ms. ap:2013ms. lib:3791ms. --:21280ms. reg:46428ms.
tool:1186ms. ap:1951ms. lib:3371ms. --:22139ms. reg:49457ms.
tool:1404ms. ap:2310ms. lib:3776ms. --:21233ms. reg:46881ms.
tool:1108ms. ap:1889ms. lib:3277ms. --:20968ms. reg:43433ms.
StringTool: 8502 ms.
WholeApacheUtils: 14234 ms.
JavaLib: 24981 ms.
Direct: 149897 ms.
WholeRegex: 324002 ms.
---------- ---------- ---------- ----------
String: 39501.50
tool:3744ms. --:4088ms. ap:5929ms. lib:7318ms. reg:15728ms.
tool:3728ms. --:4353ms. ap:5835ms. lib:7240ms. reg:14511ms.
tool:3292ms. --:4104ms. ap:5914ms. lib:7225ms. reg:15166ms.
tool:3198ms. --:3994ms. ap:5773ms. lib:6991ms. reg:15775ms.
tool:3417ms. --:3698ms. ap:5633ms. lib:7038ms. reg:15198ms.
tool:3260ms. --:4151ms. ap:6132ms. lib:7474ms. reg:15993ms.
tool:3214ms. --:3620ms. ap:5399ms. lib:6788ms. reg:15603ms.
StringTool: 23853 ms.
Direct: 28008 ms.
WholeApacheUtils: 40615 ms.
JavaLib: 50074 ms.
WholeRegex: 107974 ms.
---------- ---------- ---------- ----------
String: 0.
tool:4228ms. --:4603ms. ap:6444ms. lib:8177ms. reg:17944ms.
tool:4087ms. --:4431ms. ap:6678ms. lib:8301ms. reg:17834ms.
tool:3775ms. --:4306ms. ap:6241ms. lib:7849ms. reg:18801ms.
tool:3994ms. --:4307ms. ap:6709ms. lib:7771ms. reg:19269ms.
tool:3526ms. --:4307ms. ap:6053ms. lib:7693ms. reg:18177ms.
tool:3884ms. --:4073ms. ap:6381ms. lib:7880ms. reg:19269ms.
tool:3447ms. --:3760ms. ap:5711ms. lib:7225ms. reg:17959ms.
StringTool: 26941 ms.
Direct: 29787 ms.
WholeApacheUtils: 44217 ms.
JavaLib: 54896 ms.
WholeRegex: 129253 ms.
---------- ---------- ---------- ----------
tool:3525ms. --:3916ms. ap:5648ms. lib:6928ms. reg:15712ms.
tool:3292ms. --:3745ms. ap:5711ms. lib:7178ms. reg:15556ms.
tool:3775ms. --:4119ms. ap:6007ms. lib:7287ms. reg:16071ms.
tool:3463ms. --:3823ms. ap:5601ms. lib:7069ms. reg:14246ms.
tool:3401ms. --:4026ms. ap:5991ms. lib:7162ms. reg:15884ms.
tool:3806ms. --:4291ms. ap:5898ms. lib:7396ms. reg:15915ms.
tool:3884ms. --:4088ms. ap:5960ms. lib:7553ms. reg:15946ms.
StringTool: 25146 ms.
Direct: 28008 ms.
WholeApacheUtils: 40816 ms.
JavaLib: 50573 ms.
WholeRegex: 109330 ms.
---------- ---------- ---------- ----------
tool:3213ms. --:4322ms. ap:4869ms. lib:6522ms. reg:16897ms.
tool:3354ms. --:4010ms. ap:4899ms. lib:6647ms. reg:18614ms.
tool:3260ms. --:3792ms. ap:4463ms. lib:6117ms. reg:17178ms.
tool:3276ms. --:3776ms. ap:4696ms. lib:6444ms. reg:17678ms.
tool:3057ms. --:3838ms. ap:4853ms. lib:6382ms. reg:17351ms.
tool:3448ms. --:4197ms. ap:5040ms. lib:6492ms. reg:18489ms.
tool:3588ms. --:4322ms. ap:5727ms. lib:7880ms. reg:20377ms.
StringTool: 23196 ms.
Direct: 28257 ms.
WholeApacheUtils: 34547 ms.
JavaLib: 46484 ms.
WholeRegex: 126584 ms.
---------- ---------- ---------- ----------
String: 300
tool:3432ms. --:3855ms. ap:5134ms. lib:6476ms. reg:18739ms.
tool:3604ms. --:3963ms. ap:5055ms. lib:6367ms. reg:19409ms.
tool:3432ms. --:3526ms. ap:4822ms. lib:5945ms. reg:18754ms.
tool:2683ms. --:3371ms. ap:4712ms. lib:6258ms. reg:18239ms.
tool:3198ms. --:3604ms. ap:4900ms. lib:6132ms. reg:19472ms.
tool:3213ms. --:3620ms. ap:4790ms. lib:6133ms. reg:17444ms.
tool:3135ms. --:3823ms. ap:5367ms. lib:6679ms. reg:18941ms.
StringTool: 22697 ms.
Direct: 25762 ms.
WholeApacheUtils: 34780 ms.
JavaLib: 43990 ms.
WholeRegex: 130998 ms.
---------- ---------- ---------- ----------
String: -570
tool:3323ms. --:3527ms. ap:5290ms. lib:6508ms. reg:18911ms.
--:3588ms. tool:3667ms. ap:5273ms. lib:6554ms. reg:18224ms.
tool:3588ms. --:4072ms. ap:5071ms. lib:6616ms. reg:18926ms.
tool:3697ms. --:3948ms. ap:5196ms. lib:6304ms. reg:18910ms.
tool:3698ms. --:4135ms. ap:5086ms. lib:6632ms. reg:17382ms.
tool:3760ms. --:3932ms. ap:5445ms. lib:6726ms. reg:19612ms.
tool:3448ms. --:3776ms. ap:5103ms. lib:6227ms. reg:18365ms.
StringTool: 25181 ms.
Direct: 26978 ms.
WholeApacheUtils: 36464 ms.
JavaLib: 45567 ms.
WholeRegex: 130330 ms.
---------- ---------- ---------- ----------
String: -5
tool:3354ms. --:4041ms. ap:5243ms. lib:6897ms. reg:18660ms.
tool:3338ms. --:3886ms. ap:5086ms. lib:7068ms. reg:19347ms.
tool:3978ms. --:3962ms. ap:5414ms. lib:7006ms. reg:18848ms.
tool:3884ms. --:4525ms. ap:5352ms. lib:6928ms. reg:18551ms.
tool:3962ms. --:4525ms. ap:5508ms. lib:6959ms. reg:19159ms.
tool:4196ms. --:4306ms. ap:5164ms. lib:7161ms. reg:19018ms.
tool:3931ms. --:3979ms. ap:5118ms. lib:6913ms. reg:17943ms.
StringTool: 26643 ms.
Direct: 29224 ms.
WholeApacheUtils: 36885 ms.
JavaLib: 48932 ms.
WholeRegex: 131526 ms.
---------- ---------- ---------- ----------
tool:2262ms. --:2825ms. ap:3621ms. lib:5041ms. reg:13778ms.
tool:2559ms. --:3184ms. ap:4010ms. lib:5213ms. reg:15432ms.
tool:2434ms. --:3199ms. ap:4057ms. lib:5259ms. reg:14028ms.
tool:2153ms. --:2778ms. ap:3964ms. lib:5228ms. reg:13778ms.
tool:2480ms. --:2965ms. ap:3979ms. lib:4947ms. reg:15009ms.
tool:2309ms. --:2918ms. ap:3761ms. lib:4916ms. reg:13872ms.
tool:2465ms. --:2965ms. ap:3714ms. lib:5041ms. reg:14760ms.
StringTool: 16662 ms.
Direct: 20834 ms.
WholeApacheUtils: 27106 ms.
JavaLib: 35645 ms.
WholeRegex: 100657 ms.
---------- ---------- ---------- ----------
String: 2015773
tool:1872ms. --:2341ms. ap:3012ms. lib:4463ms. reg:11422ms.
tool:2387ms. --:3449ms. ap:3466ms. lib:4854ms. reg:11641ms.
tool:1919ms. --:2840ms. ap:3121ms. lib:4401ms. reg:12264ms.
tool:1685ms. --:2325ms. ap:2934ms. lib:4635ms. reg:12030ms.
tool:2012ms. --:2497ms. ap:3214ms. lib:4666ms. reg:11172ms.
tool:2184ms. --:3043ms. ap:3495ms. lib:4854ms. reg:12780ms.
tool:2496ms. --:3152ms. ap:3667ms. lib:4932ms. reg:13076ms.
StringTool: 14555 ms.
Direct: 19647 ms.
WholeApacheUtils: 22909 ms.
JavaLib: 32805 ms.
WholeRegex: 84385 ms.
---------- ---------- ---------- ----------
String: 3850
tool:1778ms. --:2653ms. ap:3137ms. lib:4401ms. reg:9878ms.
tool:1669ms. --:2466ms. ap:2824ms. lib:4105ms. reg:8739ms.
tool:1326ms. --:2107ms. ap:2513ms. lib:3621ms. reg:8817ms.
tool:1794ms. --:2501ms. ap:2844ms. lib:4000ms. reg:8603ms.
tool:1326ms. --:1904ms. ap:2326ms. lib:3527ms. reg:8957ms.
tool:1731ms. --:2342ms. ap:2810ms. lib:4059ms. reg:9116ms.
tool:1623ms. --:2560ms. ap:2746ms. lib:3840ms. reg:9364ms.
StringTool: 11247 ms.
Direct: 16533 ms.
WholeApacheUtils: 19200 ms.
JavaLib: 27553 ms.
WholeRegex: 63474 ms.
---------- ---------- ---------- ----------
String: -80058
tool:2199ms. --:2871ms. ap:3370ms. lib:4510ms. reg:9768ms.
tool:1809ms. --:2232ms. ap:2809ms. lib:4337ms. reg:10516ms.
tool:2200ms. --:2669ms. ap:3371ms. lib:4433ms. reg:10611ms.
tool:1779ms. --:2326ms. ap:2684ms. lib:3761ms. reg:9643ms.
tool:2106ms. --:2809ms. ap:3370ms. lib:4729ms. reg:10424ms.
tool:1654ms. --:2326ms. ap:3215ms. lib:4651ms. reg:10362ms.
tool:1716ms. --:1966ms. ap:2762ms. lib:4261ms. reg:10393ms.
StringTool: 13463 ms.
Direct: 17199 ms.
WholeApacheUtils: 21581 ms.
JavaLib: 30682 ms.
WholeRegex: 71717 ms.
---------- ---------- ---------- ----------
String: -1
tool:3073ms. --:3370ms. ap:4525ms. lib:5633ms. reg:17475ms.
tool:2558ms. --:3027ms. ap:4634ms. lib:5556ms. reg:16101ms.
tool:3292ms. --:3590ms. ap:4478ms. lib:5915ms. reg:16009ms.
tool:2762ms. --:2918ms. ap:4728ms. lib:5821ms. reg:16727ms.
tool:2730ms. --:2996ms. ap:4650ms. lib:5758ms. reg:16102ms.
tool:2949ms. --:3386ms. ap:4354ms. lib:5743ms. reg:15447ms.
tool:2762ms. --:3792ms. ap:5634ms. lib:6743ms. reg:16696ms.
StringTool: 20126 ms.
Direct: 23079 ms.
WholeApacheUtils: 33003 ms.
JavaLib: 41169 ms.
WholeRegex: 114557 ms.
---------- ---------- ---------- ----------
tool:795ms. --:1483ms. ap:1935ms. lib:2810ms. reg:6179ms.
tool:874ms. --:1733ms. ap:1810ms. lib:2638ms. reg:6102ms.
tool:921ms. --:1733ms. ap:1810ms. lib:2903ms. reg:6476ms.
tool:983ms. --:1717ms. ap:1858ms. lib:2716ms. reg:5978ms.
tool:1030ms. --:1702ms. ap:1764ms. lib:2778ms. reg:6040ms.
tool:842ms. --:1842ms. ap:1904ms. lib:2966ms. reg:6274ms.
tool:858ms. --:1515ms. ap:1655ms. lib:2513ms. reg:5884ms.
StringTool: 6303 ms.
Direct: 11725 ms.
WholeApacheUtils: 12736 ms.
JavaLib: 19324 ms.
WholeRegex: 42933 ms.
---------- ---------- ---------- ----------
tool:967ms. --:1795ms. ap:1966ms. lib:3043ms. reg:6226ms.
tool:921ms. --:1733ms. ap:2014ms. lib:3029ms. reg:6212ms.
tool:764ms. --:1452ms. ap:1608ms. lib:2357ms. reg:5883ms.
tool:921ms. --:1515ms. ap:1701ms. lib:2575ms. reg:6040ms.
tool:764ms. --:1499ms. ap:1576ms. lib:2762ms. reg:5980ms.
tool:811ms. --:1452ms. ap:1671ms. lib:2466ms. reg:5696ms.
tool:842ms. --:1576ms. ap:1733ms. lib:2747ms. reg:6070ms.
StringTool: 5990 ms.
Direct: 11022 ms.
WholeApacheUtils: 12269 ms.
JavaLib: 18979 ms.
WholeRegex: 42107 ms.
---------- ---------- ---------- ----------
tool:24039ms. ap:26162ms. lib:28955ms. --:31283ms. reg:56618ms.
tool:23681ms. ap:25897ms. lib:29876ms. --:31235ms. reg:56960ms.
tool:25194ms. ap:26927ms. --:29237ms. lib:29441ms. reg:57038ms.
tool:24367ms. ap:25367ms. lib:29034ms. --:31250ms. reg:55431ms.
tool:26567ms. ap:28689ms. lib:30859ms. --:34152ms. reg:61110ms.
tool:25225ms. ap:26085ms. lib:29657ms. --:31266ms. reg:58692ms.
tool:25366ms. ap:27332ms. lib:29611ms. --:30813ms. reg:58005ms.
StringTool: 174439 ms.
WholeApacheUtils: 186459 ms.
JavaLib: 207433 ms.
Direct: 219236 ms.
WholeRegex: 403854 ms.
---------- ---------- ---------- ----------
String: 78 52
tool:21731ms. ap:23136ms. lib:23949ms. --:28848ms. reg:47928ms.
tool:20467ms. ap:22403ms. lib:23636ms. --:27942ms. reg:49237ms.
tool:19625ms. ap:22964ms. lib:24385ms. --:27849ms. reg:48177ms.
tool:21653ms. ap:23775ms. lib:24650ms. --:27614ms. reg:49236ms.
tool:20795ms. ap:23073ms. lib:24088ms. --:29283ms. reg:48347ms.
tool:21279ms. ap:23167ms. lib:23761ms. --:29143ms. reg:48925ms.
tool:20795ms. ap:22247ms. lib:24619ms. --:27725ms. reg:48864ms.
StringTool: 146345 ms.
WholeApacheUtils: 160765 ms.
JavaLib: 169088 ms.
Direct: 198404 ms.
WholeRegex: 340714 ms.
---------- ---------- ---------- ----------
String: 94
--:29078ms. tool:47706ms. ap:49001ms. lib:49564ms. reg:80750ms.
--:34102ms. tool:49079ms. ap:49392ms. lib:51841ms. reg:82761ms.
--:28828ms. tool:45677ms. ap:47051ms. lib:49782ms. reg:81139ms.
--:28407ms. tool:45553ms. ap:48003ms. lib:49829ms. reg:79642ms.
--:27175ms. tool:46208ms. ap:47800ms. lib:48956ms. reg:79704ms.
--:34757ms. tool:54679ms. ap:56864ms. lib:57816ms. reg:88221ms.
--:28486ms. tool:47721ms. ap:48892ms. lib:49065ms. reg:81014ms.
Direct: 210833 ms.
StringTool: 336623 ms.
WholeApacheUtils: 347003 ms.
JavaLib: 356853 ms.
WholeRegex: 573231 ms.
---------- ---------- ---------- ----------
我们可以看到，除了 null 以及被转换数字太长的情况（30位数字以上）外，Spads 出品的 StringTool 都有非常明显的速度优势。 null 本身处理速度远远快于其它情况，即便是 StringTool ，也没有耽误多少执行时间。5 【附录】---------- ---------- ---------- ----------Google 搜索 “Java 判断字符串是否为数值”头条 http://www.blogjava.net/Javaphua/archive//122131.html显得方法最多 /blog/666544直转法 /question/无新意 /html/doc//00784.html阿帕奇工具 http://blog.csdn.net/jojoy_828/article/details/2837784比较全 http://blog.csdn.net/bluesuperman/article/details/1840952无新意 /ztf2008/archive//1393744.html无新意 /z/q.htmGoogle 搜索 “Java 从字符串中提取数值”头条 http://blog.csdn.net/wangjinyu501/article/details/7625636无新意 http://bbs.csdn.net/topics/复数，但我这边需求不涉及 /JAVA/2471.htmlGoogle 搜索“Java 字符串转化为数值”http://dongdong/79385CSDN 搜索 “Java 从字符串中提取数值”对于判断为数值后的转换有详细描述 http://blog.csdn.net/wowwow_cai/article/details/4590553同 Google http://blog.csdn.net/wangjinyu501/article/details/7625636本文还发表在我的其它技术日志CSDN ： http://blog.csdn.net/shanelooli/article/details/8432250中国开源社区： http://my.oschina.net/shane1984/blog/9808851CTO ：【综述】 http://shanelooli./0063
【程序】 http://shanelooli./0074
【功能】 http://shanelooli./blog/0356
【性能】甲 http://shanelooli./0417
【性能】乙 http://shanelooli./0418
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