public  boolean isMessyCode(String strName) {
        try {
            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();

            int length = (ch != null) ? ch.length : 0;
            for (int i = 0; i < length; i++) {
                char c = ch[i];
                if (!Character.isLetterOrDigit(c)&&!"+".equals(c)) {
                    String str = "" + ch[i];
                    if (!str.matches("[\u4e00-\u9fa5]+")) {
                        return true;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;

    }

判断乱码问题
Character.isLetterOrDigit
该函数返回一个布尔值。如果字符是字母或数字，则布尔值为true，否则为false
str.matches("[\u4e00-\u9fa5]+")
判断字符串是否为中文