创建工具类

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package com.example.bigevent.util;

import java.security.MessageDigest;

public class Md4Util {
    public static String MD5(String s)
    {
        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            byte[] btInput = s.getBytes();

            MessageDigest mdInst = MessageDigest.getInstance("MD5");

            mdInst.update(btInput);

            byte[] md = mdInst.digest();

            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)];
                str[(k++)] = hexDigits[(byte0 & 0xF)];
            }
            return new String(str);
        }
        catch (Exception e) {
            e.printStackTrace();
        }return null;
    }
    public static String convertMD5(String inStr){

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++){
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }

}

调用工具类例子

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@RequestMapping("/login")
 public Result login(@Pattern(regexp="^\\S{5,16}$")String username,@Pattern(regexp = "^\\S{5,16}$")String password){
     User byUsername = userService.findByUsername(username);
     if(byUsername==null){
         return Result.error("用户不存在");
     }else{
         //这呢
         String ps = Md4Util.MD5(password);
         System.out.println(ps);
         System.out.println(byUsername.getPassword());
         if (ps.equals(byUsername.getPassword())){
             Map<String,Object> token = new HashMap<>();
             token.put("username",byUsername.getUsername());
             token.put("id",byUsername.getId());
             String token1 = JwtUtil.getToken(token);
             stringRedisTemplate.opsForValue().set(token1,token1,1, TimeUnit.HOURS);
             return Result.success(token1);
         }else{
             return Result.error("密码错误");
         }
     }
 }