Java字符串中文检测转换

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 ;
    }
}