Java后端登录实现返回token

        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.8.2</version>
        </dependency>

package com.example.etf.story.service;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.Claim;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
 * @desc   使用token验证用户是否登录
 * @author zm
 **/
public class TokenUtils {
    //设置过期时间
    private static final long EXPIRE_DATE=1000*60*5; //1分钟
    //token秘钥
    private static final String TOKEN_SECRET = "ZCfasfhuaUUHufguGuwu2020BQWf";

    public static String token (String username,String password){

        String token = "";
        try {
            //过期时间
            Date date = new Date(System.currentTimeMillis()+EXPIRE_DATE);
            //秘钥及加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            //设置头部信息
            Map<String,Object> header = new HashMap<>();
            header.put("typ","JWT");
            header.put("alg","HS256");
            //携带username，password信息，生成签名
            token = JWT.create()
                    .withHeader(header)
                    .withClaim("username",username)
                    .withClaim("password",password).withExpiresAt(date)
                    .sign(algorithm);

        }catch (Exception e){
            e.printStackTrace();
            return  null;
        }
        return token;
    }

    public static boolean verify(String token){
        /**
         * @desc   验证token，通过返回true
         * @params [token]需要校验的串
         **/
        try {
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            JWTVerifier verifier = JWT.require(algorithm).build();

            DecodedJWT jwt = verifier.verify(token);
            return true;
        }catch (Exception e){
            System.out.println("校验失败");
            return  false;
        }
    }
    public static void main(String[] args) {
        String username ="zhangsan";
        String password = "123";
        String token = token(username,password);
        System.out.println(token);
        boolean b = verify("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJwYXNzd29yZCI6IjEyMyIsImV4cCI6MTY1NzA5ODE4MCwidXNlcm5hbWUiOiJ6aGFuZ3NhbiJ9.W-IgXJmNBrboXlzT_PtPkTavYhgRn9ZwkVpJoJLU6ks");
        Claim username1 = JWT.decode("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJwYXNzd29yZCI6IjEyMyIsImV4cCI6MTY1NzA5ODE4MCwidXNlcm5hbWUiOiJ6aGFuZ3NhbiJ9.W-IgXJmNBrboXlzT_PtPkTavYhgRn9ZwkVpJoJLU6k1").getClaim("username");
        System.out.println("我是从token中获取的信息"+username1.asString());

        System.out.println(b);
    }
}