[JAVA]判断字符串是否为乱码

    import java.util.regex.Matcher;  
    import java.util.regex.Pattern;  
      
    public class MessyCodeCheck {  
      
      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;  
      }  
      
      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;  
              System.out.print(c);  
            }  
          }  
        }  
        float result = count / chLength;  
        if (result > 0.4) {  
          return true;  
        } else {  
          return false;  
        }  
      
      }  
      
      public static void main(String[] args) {  
        System.out.println(isMessyCode("*��JTP.jar�ļ����JTP�ļ���ȡ��ͼƬ��Դ"));  
        System.out.println(isMessyCode("你好"));  
      }  
    }