Created
June 17, 2015 10:32
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版本字符串的比较
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/** | |
* 比较两个版本。 0 :两个版本相等; 1 : version1 > version2; -1 : version1 < version2 | |
* 仅适用于由数字和 "." 符号构成的版本号字符串。 对应正则规则 \d+(\.\d+)+ | |
* 如果 version1 和 version 2 均为 empty 返回0 , 否则 empty 恒小于任意字符串。 | |
*/ | |
private static int compareVersionString(String version1, String version2) { | |
if(StringUtils.isEmpty(version1)) { | |
if(StringUtils.isEmpty(version2)){ | |
return 0; | |
} else { | |
return -1; | |
} | |
} else if(StringUtils.isEmpty(version2)) { | |
return 1; | |
} | |
if(!version1.matches("\\d+(\\.\\d+)+") || !version2.matches("\\d+(\\.\\d+)+")){ | |
throw new RuntimeException("version format error! version1 : " + version1 + " version2:" + version2); | |
} | |
String[] ver1Array = version1.split("\\."); | |
String[] ver2Array = version2.split("\\."); | |
for(int i = 0; i < Math.min(ver1Array.length, ver2Array.length); i++ ) { | |
int n1 = Integer.parseInt(ver1Array[i]); | |
int n2 = Integer.parseInt(ver2Array[i]); | |
if(n1 != n2) { | |
return n1 > n2 ? 1 : -1; | |
} | |
} | |
if (ver1Array.length > ver2Array.length) { | |
return 1; | |
} else if (ver1Array.length < ver2Array.length) { | |
return -1; | |
} else { | |
return 0; | |
} | |
} |
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