MD5工具类的封装

package com.baizhi.zcn.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

public class Md5Utils {

//参数1:输入明文密码
public static String  getMd5Code(String password){
	StringBuilder sb = null;
	try {
		//创建加密对象
		//参数1: 算法名字
		MessageDigest messageDigest = MessageDigest.getInstance("MD5");
		//进行加密  返回加密之后结果也是字节
		byte[] digest = messageDigest.digest(password.getBytes());
		sb = new StringBuilder();
		for (byte b : digest) {
			//位运算
			int len = b & 0xff;    //0  0x0 0x1 0x2 0x3 0x4 0x9  10  0xa   15  0xf  16 0x10 170x11
			if(len<=15){
				sb.append("0");
			}
			sb.append(Integer.toHexString(len));
		}
	} catch (NoSuchAlgorithmException e) {
		e.printStackTrace();
	}
	return sb.toString();
}
	
//生成随机的盐
public static  String  getSalt(int n){
	char[] code =  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
	StringBuilder sb = new StringBuilder();
	for (int i = 0; i < n; i++) {
		sb.append(code[new Random().nextInt(code.length)]);
	}
	return sb.toString();
}

//测试
public static void main(String[] args) throws NoSuchAlgorithmException {
	
	String salt = getSalt(8);
	System.out.println(salt);
	String md5Code = getMd5Code("123456");
	System.out.println(md5Code);
	
	//测试spring框架封装的Md5 
	String md5DigestAsHex = DigestUtils.md5DigestAsHex("111111".getBytes());
	System.out.println(md5DigestAsHex);
}

}
Spring框架本身已经封装了MD5，在类中直接调用DigestUtils.md5DigestAsHex();方法传入明文密码，返回一个字符串类型加密之后的密码