返回的md5 与数据库不一致，无论输出什么密码都提示错误

相关代码：

package com.imooc.reader.utils;

import org.apache.commons.codec.digest.DigestUtils;

public class Md5Utils {
    public static String addSalt(String password, Integer salt) {
        char[] chars = password.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            chars[i] = (char) (chars[i] + salt);
        }
        String str = new String(chars);
        String md5 = DigestUtils.md5Hex(str);
        return md5;
    }

    public static void main(String[] args) {
        System.out.println(Md5Utils.addSalt("s123456", 1039));
    }
}

相关代码：

package com.imooc.reader.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.imooc.reader.entity.Member;
import com.imooc.reader.expection.BussinessException;
import com.imooc.reader.mapper.MemberMapper;
import com.imooc.reader.service.MemberService;
import com.imooc.reader.utils.Md5Utils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;
import java.util.Random;

@Service("memberService")
@Transactional
public class MemberServiceImpl implements MemberService {
    @Resource
    private MemberMapper memberMapper;

    @Override
    public Member selectById(Long memberId) {
        Member member = memberMapper.selectById(memberId);
        return member;
    }

    @Override
    public Member createMember(String username, String password, String nickname) {
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("username", username);
        List memberList = memberMapper.selectList(queryWrapper);
        if (memberList.size()>0) {
            throw new BussinessException("M01", "用户已存在");
        }
        Member member = new Member();
        member.setUsername(username);
        member.setNickname(nickname);
        member.setCreateTime(new Date());
        Random random = new Random();
        Integer salt = random.nextInt(1000) + 1000;
        member.setSalt(salt);
        String md5 = Md5Utils.addSalt(password, salt);
        member.setPassword(md5);
        memberMapper.insert(member);
        return member;
    }

    @Override
    public Member checkLogin(String username, String password) {
        QueryWrapper<Member> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("username", username);
        Member member = memberMapper.selectOne(queryWrapper);
        if (member == null) {
            throw new BussinessException("M02", "用户名不存在");
        }
        System.out.println(member.getSalt());
        String md5 = Md5Utils.addSalt(password, member.getSalt());
        if ( !md5.equals(member.getPassword())) {
            throw new BussinessException("M03", "密码错误，请核证后输入");
        }
        return member;
    }

}

相关代码：

​package com.imooc.reader.controller;

import com.imooc.reader.expection.BussinessException;
import com.imooc.reader.service.MemberService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.nio.BufferOverflowException;
import java.util.HashMap;
import java.util.Map;

@Controller
public class MemberController {
    @Resource
    private MemberService memberService;

    @GetMapping("/register.html")
    public ModelAndView showRegister() {
        return new ModelAndView("/register");
    }

    @PostMapping("/register")
    @ResponseBody
    public Map register(String vc, String username, String password, String nickname, HttpServletResponse response, HttpServletRequest request) {
        String verifyCode = (String) request.getSession().getAttribute("KaptchaVerifyCode");
        Map result = new HashMap();
        if (vc == null || verifyCode == null || !vc.equalsIgnoreCase(verifyCode)) {
            result.put("code", "vc01");
            result.put("msg", "验证码错误");
        } else {
            try {
                memberService.createMember(username, password, nickname);
                result.put("code", "0");
                result.put("msg", "success");
            } catch (BussinessException ex) {
                ex.printStackTrace();
                result.put("code", ex.getCode());
                result.put("msg", ex.getMsg());
            }
        }
        return result;
    }

    @GetMapping("/login.html")
    public ModelAndView login() {
        return new ModelAndView("/login");
    }

    @PostMapping("/check_login")
    @ResponseBody
    public Map checkLogin(String vc,String username, String password, HttpSession session) {
        String verifyCode = (String) session.getAttribute("KaptchaVerifyCode");
        Map result = new HashMap();
        if (vc == null || verifyCode == null || !verifyCode.equalsIgnoreCase(vc)) {
            result.put("code", "vc01");
            result.put("msg", "验证码错误");
        }else{
            try {
                memberService.checkLogin(username, password);
                result.put("code", "0");
                result.put("msg", "success");
            } catch (BussinessException ex) {
                ex.printStackTrace();
                result.put("code", ex.getCode());
                result.put("msg", ex.getMsg());
            }
        }
        return result;
    }
}