【Java----判断字符串是否乱码】

import java.util.regex.Matcher;
import java.util.regex.Pattern;  

public class ChineseUtill {  

    private 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 = 0 ;
        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;
                }
                chLength++;
            }
        }
        float result = count / chLength ;
        if (result > 0.4) {
            return true;
        } else {
            return false;
        }
    }  

    public static String toChinese(Object msg){
        String tempMsg = TransformUtils.toString(msg) ;
        if(isMessyCode(tempMsg)){
            try {
                return new String(tempMsg.getBytes("ISO8859-1"), "UTF-8");
            } catch (Exception e) {
            }
        }
        return tempMsg ;
    }
}  

只能校验出纯文字的情况，如果文字中包含字符或者html代码也会认为是乱码