加密解密

直接看源码，一看就懂了

package com.zit.test;

import java.security.MessageDigest;

/**
 * 加密
 */
public class DbMain {
    //传入字符加密
    public static String md5(String str) {
        StringBuilder s = new StringBuilder(32);
        try {
            MessageDigest md = MessageDigest.getInstance("md5");
            md.update(str.getBytes());
            s = new StringBuilder(32);
            for (byte b : md.digest()) {
                s.append(String.format("%x", b));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return s.toString();
    }

    //传入字符加密
    public static String sha1(String str) {
        StringBuilder s = new StringBuilder(32);
        try {
            MessageDigest md = MessageDigest.getInstance("sha1");
            md.update(str.getBytes());
            s = new StringBuilder(32);
            for (byte b : md.digest()) {
                s.append(String.format("%x", b));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return s.toString();
    }

    public static String password(String account, String password) {
        String m = md5(account + password);
        String s = sha1(account + password);
        StringBuilder ss = new StringBuilder(32);
        ss.append(m.substring(0, 10));
        ss.append(s.substring(0, 10));
        ss.append(m.substring(18, 24));
        ss.append(s.substring(18, 24));
        return ss.toString();
    }

    /**
     * @param account
     * @param password
     * @param hashpass
     * @return
     */
    public static boolean isPassword(String account, String password, String hashpass) {
        boolean flag = false;
        if (hashpass.equals(password(account, password))) {
            flag = true;
        }
        return flag;
    }

    public static void main(String[] args) {
        String hashpass = password("李四", "123");
        System.out.println(password("李四", "123"));
        System.out.println(isPassword("admin", "123", hashpass));
        System.out.println(isPassword("李四", "123", hashpass));
    }


    public static void main11(String[] args) {
       /* String account="李四";
        String password="123";
        System.out.println(password(account,password));
        System.out.println(password(account,password).length());*/
        String account = "admin";
        String password = "123";
        String pass = password(account, password);
        System.out.println(pass);





      /*  String a="admin";
        System.out.println(a);
        System.out.println(md5(a));
        System.out.println(md5(a).length());
        System.out.println("**********");
        System.out.println(sha1(a));
        System.out.println(sha1(a).length());*/

        //21232f297a57a5a743894a0e4a801fc3 mysql加密
        //21232f297a57a5a743894ae4a801fc3  咱们加密
    }

}