判断一个字符中是否有乱码

package com.test;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/**
 * @description 判断中文是否乱码
 */
 
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;  
	        }  
	      }  
	    }  
	    float result = count / chLength;  
	    if (result > 0.2) {//乱码字符 大于原内容的20%算是乱码  
	      return true;  
	    } else {  
	      return false;  
	    }  
	  
	  }  
	  
	  public static void main(String[] args) {  
	    System.out.println(isMessyCode("XYZr�������ABCDԴ"));  
	    System.out.println(isMessyCode("平台新￥%&#@*（版本发布"));
	    System.out.println(isMessyCode("System.out.println"));  
	  }  
	}