public static String md5(String src){        try {            StringBuffer buffer = new StringBuffer();            char[] chars = {‘0‘,‘1‘,‘2‘,‘3‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘,‘A‘,‘B‘,‘C‘,‘D‘,‘E‘,‘F‘};            byte[] bytes = src.getBytes();            MessageDigest md = MessageDigest.getInstance("MD5");            byte[] targ = md.digest(bytes);            for(byte b: targ){                buffer.append(chars[(b >> 4) & 0x0F]);                buffer.append(chars[b & 0x0F]);            }            return buffer.toString();        } catch (Exception e) {            e.printStackTrace();        }        return null ;    }