package com.mms.utils;

import java.security.MessageDigest;

/**

 * Created by codermen on 2017/10/26.

 */

public class MD5Util {

    public static void main(String[] args) {

        String pwd = getMD5("99991");

        System.out.println(pwd);

    }

    //生成MD5

    public static String getMD5(String message) {

        String md5 = "";

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");  // 创建一个md5算法对象

            byte[] messageByte = message.getBytes("UTF-8");

            byte[] md5Byte = md.digest(messageByte);              // 获得MD5字节数组,16*8=128位

            md5 = bytesToHex(md5Byte);                            // 转换为16进制字符串

        } catch (Exception e) {

            e.printStackTrace();

        }

        return md5;

    }

    // 二进制转十六进制

    public static String bytesToHex(byte[] bytes) {

        StringBuffer hexStr = new StringBuffer();

        int num;

        for (int i = 0; i < bytes.length; i++) {

            num = bytes[i];

            if(num < 0) {

                num += 256;

            }

            if(num < 16){

                hexStr.append("0");

            }

            hexStr.append(Integer.toHexString(num));

        }

        return hexStr.toString().toUpperCase();

    }

}