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发表时间：2012-12-26
Spads 出品，作者 WangXP 与 Shane /**
* <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。
* <pre>
* StringTool.fetchNumberValue("15") = 15 (java.lang.Integer)
* StringTool.fetchNumberValue("300 1500 1010")
* = 30015001010 (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("3.1415926.5358") = null
* StringTool.fetchNumberValue("13205972138597109830758190748937102794")
* = 1.320597213859711E37 (java.lang.Double)
* </pre>
*
* 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。
*
* @see StringTool#removeChar(String, char)
* @param numStr 准备提取数值的字符串
* @return 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)
return null;
final StringBuilder numBuilder = new StringBuilder();
boolean doubleFlag = false;
final int length = numStr.length();
char numChar;
for (int index = 0; index != length; index++)
{
numChar = numStr.charAt(index);
if (numChar > 57) return null;
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
case 3:
if (doubleFlag || index == length - 1) return null;
doubleFlag = true;
// 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
case 1: continue;
// 如果是负号，又不是首位，则按非数值字符串进行返回
case 2:
if (index == 0)
{
numBuilder.append(numChar);
continue;
}
// 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
case 0: return null;
}
}
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) num;
if (finalNum != num) return num;
return finalNum;
}
/**
* <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) ---------- ---------- ---------- ---------- String: 28 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) ---------- ---------- ---------- ---------- String: In StringTool way, get: null (null) ---------- ---------- ---------- ---------- String: 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: 3.1415926.5358 In StringTool way, get: null (null) ---------- ---------- ---------- ---------- String: 39501.50 In StringTool way, get: 39501.5 (Double) ---------- ---------- ---------- ---------- String: 0.000385427 In StringTool way, get: 3.85427E-4 (Double) ---------- ---------- ---------- ---------- String: .33796678 In StringTool way, get: 0.33796678 (Double) ---------- ---------- ---------- ---------- String: 300011110000 In StringTool way, get: 300011110000 (Long) ---------- ---------- ---------- ---------- String: 300 1500 1010 In StringTool way, get: 30015001010 (Long) ---------- ---------- ---------- ---------- String: -570 0015 6726 In StringTool way, get: -57000156726 (Long) ---------- ---------- ---------- ---------- String: -2378957832975 In StringTool way, get: -2378957832975 (Long) ---------- ---------- ---------- ---------- String: 1370 0000 In StringTool way, get: 13700000 (Integer) ---------- ---------- ---------- ---------- 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 2853 2781 In StringTool way, get: -128532781 (Integer) ---------- ---------- ---------- ---------- String: 3 In StringTool way, get: 3 (Integer) ---------- ---------- ---------- ---------- String: 0 In StringTool way, get: 0 (Integer) ---------- ---------- ---------- ---------- String: -597213859710830758190748937102794 In StringTool way, get: -5.972138597108308E32 (Double) ---------- ---------- ---------- ---------- String: 78 9254 3253 2452 9572 8532 In StringTool way, get: 7.892543253245296E21 (Double) ---------- ---------- ---------- ---------- String: 13205972138597109830758190748937102794 In StringTool way, get: 1.320597213859711E37 (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 SimpleJavaLib B、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)))
return false;
return true;
}
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 CharAscii private Number fetchNumberByCharAscii(String numStr)
{
for (int i = numStr.length(); --i >= 0; )
{
int chr = numStr.charAt(i);
if (chr < 48 || chr > 57) return null;
}
return Long.valueOf(numStr);
}
G、简单阿帕奇工具方法 SimpleApacheUtils核心判断方法为 org.apache.commons.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 org.apache.commons.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",
"3.1415926.5358", "39501.50", "0.000385427", ".33796678",
"300011110000", "300 1500 1010", "-570 0015 6726", "-2378957832975",
"1370 0000", "2015773", "3850", "-80058", "-1 2853 2781", "3", "0",
"-597213859710830758190748937102794", "78 9254 3253 2452 9572 8532",
"13205972138597109830758190748937102794"
};
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) ---------- ---------- ---------- ---------- String: 28 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) ---------- ---------- ---------- ---------- String: 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) ---------- ---------- ---------- ---------- String: 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: 3.1415926.5358 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: 0.000385427 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) ---------- ---------- ---------- ---------- String: .33796678 In StringTool way, get: 0.33796678 (Double) In SimpleJavaLib way, get: null (null) In JavaLib way, get: 0.33796678 (Double) In SimpleRegex way, get: null (null) In WholeRegex way, get: 0.33796678 (Double) In Direct way, get: 0.33796678 (Double) In CharAscii way, get: null (null) In SimpleApacheUtils way, get: null (null) In WholeApacheUtils way, get: 0.33796678 (Double) ---------- ---------- ---------- ---------- String: 300011110000 In StringTool way, get: 300011110000 (Long) In SimpleJavaLib way, get: 300011110000 (Long) In JavaLib way, get: 300011110000 (Long) In SimpleRegex way, get: 300011110000 (Long) In WholeRegex way, get: 300011110000 (Long) In Direct way, get: 300011110000 (Long) In CharAscii way, get: 300011110000 (Long) In SimpleApacheUtils way, get: 300011110000 (Long) In WholeApacheUtils way, get: 300011110000 (Long) ---------- ---------- ---------- ---------- String: 300 1500 1010 In StringTool way, get: 30015001010 (Long) In SimpleJavaLib way, get: null (null) In JavaLib way, get: 30015001010 (Long) In SimpleRegex way, get: null (null) In WholeRegex way, get: 30015001010 (Long) In Direct way, get: 30015001010 (Long) In CharAscii way, get: null (null) In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "300 1500 1010" In WholeApacheUtils way, get: 30015001010 (Long) ---------- ---------- ---------- ---------- String: -570 0015 6726 In StringTool way, get: -57000156726 (Long) In SimpleJavaLib way, get: null (null) In JavaLib way, get: -57000156726 (Long) In SimpleRegex way, get: null (null) In WholeRegex way, get: -57000156726 (Long) In Direct way, get: -57000156726 (Long) In CharAscii way, get: null (null) In SimpleApacheUtils way, get: null (null) In WholeApacheUtils way, get: -57000156726 (Long) ---------- ---------- ---------- ---------- String: -2378957832975 In StringTool way, get: -2378957832975 (Long) In SimpleJavaLib way, get: null (null) In JavaLib way, get: -2378957832975 (Long) In SimpleRegex way, get: null (null) In WholeRegex way, get: -2378957832975 (Long) In Direct way, get: -2378957832975 (Long) In CharAscii way, get: null (null) In SimpleApacheUtils way, get: null (null) In WholeApacheUtils way, get: -2378957832975 (Long) ---------- ---------- ---------- ---------- String: 1370 0000 In StringTool way, get: 13700000 (Integer) In SimpleJavaLib way, get: null (null) In JavaLib way, get: 13700000 (Integer) In SimpleRegex way, get: null (null) In WholeRegex way, get: 13700000 (Integer) In Direct way, get: 13700000 (Integer) In CharAscii way, get: null (null) In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "1370 0000" In WholeApacheUtils way, get: 13700000 (Integer) ---------- ---------- ---------- ---------- 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 2853 2781 In StringTool way, get: -128532781 (Integer) In SimpleJavaLib way, get: null (null) In JavaLib way, get: -128532781 (Integer) In SimpleRegex way, get: null (null) In WholeRegex way, get: -128532781 (Integer) In Direct way, get: -128532781 (Integer) In CharAscii way, get: null (null) In SimpleApacheUtils way, get: null (null) In WholeApacheUtils way, get: -128532781 (Integer) ---------- ---------- ---------- ---------- String: 3 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) ---------- ---------- ---------- ---------- String: 0 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) ---------- ---------- ---------- ---------- String: -597213859710830758190748937102794 In StringTool way, get: -5.972138597108308E32 (Double) In SimpleJavaLib way, get: null (null) In JavaLib way, get: -5.972138597108308E32 (Double) In SimpleRegex way, get: null (null) In WholeRegex way, get: -5.972138597108308E32 (Double) In Direct way, get: null (null) In CharAscii way, get: null (null) In SimpleApacheUtils way, get: null (null) In WholeApacheUtils way, get: -5.972138597108308E32 (Double) ---------- ---------- ---------- ---------- String: 78 9254 3253 2452 9572 8532 In StringTool way, get: 7.892543253245296E21 (Double) In SimpleJavaLib way, get: null (null) In JavaLib way, get: 7.892543253245296E21 (Double) In SimpleRegex way, get: null (null) In WholeRegex way, get: 7.892543253245296E21 (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 9254 3253 2452 9572 8532" In WholeApacheUtils way, get: 7.892543253245296E21 (Double) ---------- ---------- ---------- ---------- String: 13205972138597109830758190748937102794 In StringTool way, get: 1.320597213859711E37 (Double) In SimpleJavaLib way, get EXCEPTION: java.lang.NumberFormatException: For input string: "13205972138597109830758190748937102794" In JavaLib way, get: 1.320597213859711E37 (Double) In SimpleRegex way, get EXCEPTION: java.lang.NumberFormatException: For input string: "13205972138597109830758190748937102794" In WholeRegex way, get: 1.320597213859711E37 (Double) In Direct way, get: null (null) In CharAscii way, get EXCEPTION: java.lang.NumberFormatException: For input string: "13205972138597109830758190748937102794" In SimpleApacheUtils way, get EXCEPTION: java.lang.NumberFormatException: For input string: "13205972138597109830758190748937102794" In WholeApacheUtils way, get: 1.320597213859711E37 (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()
{
Runnable r;
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 = false;
if (timeUsedCount.get("StringTool") == null)
timeUsedCount.put("StringTool", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopNum; )
{
try { StringTool.parseNumber(numStr); }
catch (Exception ex) { hasEx = true; }
}
long use = System.currentTimeMillis() - start;
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 = false;
if (timeUsedCount.get("JavaLib") == null)
timeUsedCount.put("JavaLib", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopNum; )
{
try { FetchNumberTest.this.fetchNumberByJavaLib(numStr); }
catch (Exception ex) { hasEx = true; }
}
long use = System.currentTimeMillis() - start;
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 = false;
if (timeUsedCount.get("WholeRegex") == null)
timeUsedCount.put("WholeRegex", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopNum; )
{
try { FetchNumberTest.this.fetchNumberByRegex(numStr, false); }
catch (Exception ex) { hasEx = true; }
}
long use = System.currentTimeMillis() - start;
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();
// Direct
r = new Runnable()
{
public void run()
{
boolean hasEx = false;
if (timeUsedCount.get("Direct") == null)
timeUsedCount.put("Direct", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopNum; )
{
try { FetchNumberTest.this.fetchNumberByDirect(numStr); }
catch (Exception ex) { hasEx = true; }
}
long use = System.currentTimeMillis() - start;
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 = false;
if (timeUsedCount.get("WholeApacheUtils") == null)
timeUsedCount.put("WholeApacheUtils", 0L);
long start = System.currentTimeMillis();
for (int index = -1; ++index != FetchNumberTest.this.loopNum; )
{
try { FetchNumberTest.this.fetchNumberByApacheUtils(numStr); }
catch (Exception ex) { hasEx = true; }
}
long use = System.currentTimeMillis() - start;
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 12001000 ，各种情况性能表现如下。Performance test... Loop times = 12001000 ---------- ---------- ---------- ---------- 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. ---------- ---------- ---------- ---------- String: 28 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. ---------- ---------- ---------- ---------- String: 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. ---------- ---------- ---------- ---------- String: 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: 3.1415926.5358 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: 0.000385427 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. ---------- ---------- ---------- ---------- String: .33796678 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. ---------- ---------- ---------- ---------- String: 300011110000 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 1500 1010 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 0015 6726 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: -2378957832975 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. ---------- ---------- ---------- ---------- String: 1370 0000 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 2853 2781 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. ---------- ---------- ---------- ---------- String: 3 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. ---------- ---------- ---------- ---------- String: 0 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. ---------- ---------- ---------- ---------- String: -597213859710830758190748937102794 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 9254 3253 2452 9572 8532 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: 13205972138597109830758190748937102794 --: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/2012/05/18/122131.html 显得方法最多 http://javapub.iteye.com/blog/666544 直转法 http://zhidao.baidu.com/question/38323159 无新意 http://www.ideagrace.com/html/doc/2006/04/28/00784.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 http://www.cnblogs.com/ztf2008/archive/2009/02/19/1393744.html 无新意 http://wenwen.soso.com/z/q198258851.htm Google 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/340240275 复数，但我这边需求不涉及 http://www.bcw52.com/JAVA/2471.html Google 搜索“Java 字符串转化为数值” http://dongdong1314.blog.51cto.com/389953/79385 CSDN 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/98088 51CTO ： 【综述】 http://shanelooli.blog.51cto.com/5523233/1100063 【程序】 http://shanelooli.blog.51cto.com/5523233/1100074 【功能】 http://shanelooli.blog.51cto.com/blog/5523233/1100356 【性能】甲 http://shanelooli.blog.51cto.com/5523233/1100417 【性能】乙 51CTO - Spads字符 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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