简单MD5加密方法

public static String md5(String psd){        psd=psd+"phonesafe";//加盐处理,避免MD5码被轻易解析        byte[] hash;        try {//1,指定加密算法类型(MD5),并将需要加密的字符串中转换成byte类型的数组,然后进行随机哈希过程                            hash=MessageDigest.getInstance("MD5").digest(psd.getBytes("UTF-8"));        } catch (NoSuchAlgorithmException e) {            throw new RuntimeException("MD5 should be supported?",e);        } catch (UnsupportedEncodingException e) {            throw new RuntimeException("UTF-8 should be supported?",e);        }        //2,循环遍历bs,然后让其生成32位字符串,固定写法        StringBuilder hex=new StringBuilder(hash.length*2);        for(byte b:hash){        //3,拼接字符串过程            if((b & 0xFF)<0x10)hex.append("0");            hex.append(Integer.toHexString(b & 0xFF));        }        return hex.toString();    }