中文乱码在项目中是经常会遇到的情况。当我们通过设置request和response字符集，但是还是出现中文乱码的时候，今天给介绍一种通过java方法实现判断string是否为乱码的方法。

	 /**      * 判断字符串是否是乱码      *      * @param strName 字符串      * @return 是否是乱码      */      public static boolean isMessyCode(String strName) {          Pattern p = Pattern.compile("\\s*|t*|r*|n*");          Matcher m = p.matcher(strName);          String after = m.replaceAll("");//去重为空的情况        String temp = after.replaceAll("\\p{P}", "");          char[] ch = temp.trim().toCharArray();          float chLength = ch.length;          float count = 0;          for (int i = 0; i < ch.length; i++) {              char c = ch[i];              if (!Character.isLetterOrDigit(c)) {                  if (!isChinese(c)) {                      count = count + 1;                  }              }          }          float result = count / chLength;          if (result > 0.4) {              return true;          } else {              return false;          }         }            /**      * 判断字符是否是中文      *      * @param c 字符      * @return 是否是中文      */      public static boolean isChinese(char c) {          Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);          if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS                  || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS                  || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A                  || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION                  || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION                  || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {              return true;          }          return false;      }

定义调用：

public static void main(String[] args) {		// TODO Auto-generated method stub				/*List<String> list = new ArrayList<String>();				Map<List<String>, String> map = new HashMap<>();*/						String messcode = "ss201888asdf;#????";		System.out.println(">>>>>>>>>>:"+isMessyCode(messcode));				 	}

输出结果：

>>>>>>>>>>:false