Java:使用MD5加密步骤

    //md5加密        public static String getMD5(String source){            MessageDigest md5;            StringBuilder sb=new StringBuilder();            byte[] buf=source.getBytes();            try{                md5=MessageDigest.getInstance("MD5");                md5.update(buf);                byte[] data=md5.digest();                for(byte b:data){                    sb.append(Integer.toHexString(b&0xff));                }            }            catch(Exception e){                e.printStackTrace();            }            return sb.toString();        }