JAVA判断字符串是否为乱码

???转载，源文件http://blog.csdn.net/jonay/article/details/6644167

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1. import?java.util.regex.Matcher;??import?java.util.regex.Pattern;??
2. ??public?class?MessyCodeCheck?{??
3. ????public?static?boolean?isChinese(char?c)?{??
4. ????Character.UnicodeBlock?ub?=?Character.UnicodeBlock.of(c);??????if?(ub?==?Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS??
5. ????????||?ub?==?Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS??????????||?ub?==?Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A??
6. ????????||?ub?==?Character.UnicodeBlock.GENERAL_PUNCTUATION??????????||?ub?==?Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION??
7. ????????||?ub?==?Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS)?{????????return?true;??
8. ????}??????return?false;??
9. ??}????
10. ??public?static?boolean?isMessyCode(String?strName)?{??????Pattern?p?=?Pattern.compile("\\s*|\t*|\r*|\n*");??
11. ????Matcher?m?=?p.matcher(strName);??????String?after?=?m.replaceAll("");??
12. ????String?temp?=?after.replaceAll("\\p{P}",?"");??????char[]?ch?=?temp.trim().toCharArray();??
13. ????float?chLength?=?ch.length;??????float?count?=?0;??
14. ????for?(int?i?=?0;?i?<?ch.length;?i++)?{????????char?c?=?ch[i];??
15. ??????if?(!Character.isLetterOrDigit(c))?{????
16. ????????if?(!isChinese(c))?{????????????count?=?count?+?1;??
17. ??????????System.out.print(c);??????????}??
18. ??????}??????}??
19. ????float?result?=?count?/?chLength;??????if?(result?>?0.4)?{??
20. ??????return?true;??????}?else?{??
21. ??????return?false;??????}??
22. ????}??
23. ????public?static?void?main(String[]?args)?{??
24. ????System.out.println(isMessyCode("*??JTP.jar??????JTP?????????????"));??????System.out.println(isMessyCode("你好"));??
25. ??}??}??