[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"));        }      }