public class ChineseUtils {

    public static void main(String[] args) {

        String str = "中国 (1).jpg";

        try {

            String str2 = new String(str.getBytes("iso-8859-1"),"iso-8859-1");

            System.out.println(str2);

            System.out.println(isMessyCode(str2));

            System.out.println(toChinese(str2));

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

    }

    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 =  ;

        float count = ;

        for (int i = ; i < ch.length; i++) {

            char c = ch[i];

            if (!Character.isLetterOrDigit(c)) {

                if (!isChinese(c)) {

                    count = count + ;

                }

                chLength++;

            }

        }

        float result = count / chLength ;

        if (result > 0.4) {

            return true;

        } else {

            return false;

        }

    }

    public static String toChinese(String msg){

        if(isMessyCode(msg)){

            try {

                return new String(msg.getBytes("ISO8859-1"), "UTF-8");

            } catch (Exception e) {

            }

        }

        return msg ;

    }

}