/**
  * 判斷字符是否是中文
  *
  * @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;
 }
 /**
  * 判斷字符串是否是亂碼
  *
  * @param strName 字符串
  * @return 是否是亂碼
  */
 public static boolean isMessyCode(String strName) {
  Pattern p = Pattern.compile("\s*|t*|r*|n*");
  Matcher m = p.matcher(strName);
  String after = m.replaceAll("");
  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;
  }
 }
 public static void main(String[] args) {
  System.out.println(isMessyCode("韩顺平"));
  System.out.println(isMessyCode("你好"));
 }