JwtUtil

package com.lin.springboot01.utils;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import java.util.Date;
import java.util.Map;

public class JwtUtil {
    private static final String KEY = "liner2332";
    //接受业务数据，生成token并返回
    public static String genToken(Map<String,Object> claims) {
        return JWT.create()
                    .withClaim("claims",claims)
                    .withExpiresAt(new Date(System.currentTimeMillis()+1000*60*60*12))
                    .sign(Algorithm.HMAC256(KEY));
    }
    //接收token，验证token，并返回业务数据
    public static Map<String,Object> parseToken(String token){
        return JWT.require(Algorithm.HMAC256(KEY))
                .build()
                .verify(token)
                .getClaim("claims")
                .asMap();
    }
}

UserController

    @PostMapping("/login")
    public Result<String> login(@Pattern(regexp = "^\\S{5,16}$") String username, @Pattern(regexp = "^\\S{5,16}$")String password){
        //根据用户名查询用户
        User loginUser = userService.findByName(username);
        //判断该用户是否存在
        if (loginUser==null){
            return Result.error("用户名错误");
        }
        //判断密码是否正确
        if (MD5Utils.string2MD5(password).equals(loginUser.getPassword())){
            //登录成功
            Map<String,Object> claims = new HashMap<>();
            claims.put("id",loginUser.getId());
            claims.put("username",loginUser.getUsername());
            String token = JwtUtil.genToken(claims);
            return Result.success(token);
        }
        return Result.error("密码错误");
    }