Md5加密

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常在开发中用到Md5加密算法现，记录下。

package com.example.lic;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class Md5Util {public static void main(String[] args) {String psd = "123";encoder(psd);}private static void encoder(String psd) {try {StringBuffer stringBuffer = new StringBuffer();// 指定加密算法类型MessageDigest instance = MessageDigest.getInstance("MD5");// 将需要加密的字符串转换成byte类型的数组，然后进行随机哈希过程byte[] digest = instance.digest(psd.getBytes());System.out.println("长度：" + digest.length);// 循环遍历digest,然后让其生成32位字符串，固定写法for (byte b : digest) {int i = b & 0xff;// int类型的i需要转化为16进制字符String hexString = Integer.toHexString(i);System.out.println("hexString:" + hexString);if (hexString.length() < 2) {hexString = "0" + hexString;}stringBuffer.append(hexString);}System.out.println("stringBuffer:" + stringBuffer.toString());} catch (NoSuchAlgorithmException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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