package cn.peter;

import sun.misc.BASE64Encoder;

import java.io.UnsupportedEncodingException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

/**

 * Created by zyz on 2016-10-8.

 */

public class Md5Test {

    public static void main(String[] args) throws NoSuchAlgorithmException, UnsupportedEncodingException {

        String password="123456";

        MessageDigest md=MessageDigest.getInstance("md5");

        byte[] bMd5=md.digest(password.getBytes());

        int i;

        StringBuffer buffer=new StringBuffer("");

        for(int k=0;k<bMd5.length;k++){

            i=bMd5[k];

            if(i<0){

                i+=256;

            }

            if(i<16){

                buffer.append("0");

            }

//            System.out.println(i+"->"+Integer.toHexString(i));

            buffer.append(Integer.toHexString(i));

        }

        BASE64Encoder encoder=new BASE64Encoder();

        String strBase64=encoder.encode(password.getBytes());

        String strBase64Md5=encoder.encode(bMd5);

        System.out.println(password+" 占字符个数为:"+password.length());

        System.out.println(password+" 占的字节数为:"+password.getBytes("utf-8").length);

        System.out.println(password+" md5编码后占的字节数为:"+bMd5.length);

        System.out.println(password+" md5编码为:"+buffer.toString()+",共"+buffer.toString().length()+"个字符.");

        System.out.println(password+" Base64编码为:"+strBase64+",共"+strBase64.length()+"个字符.");

        System.out.println(password+" 的md5编码转Base64编码为:"+strBase64Md5+",共"+strBase64Md5.length()+"个字符.");

    }

}