Spring Boot 集成 JWT

1.首先引入maven依赖

        
        
        
           com.auth0
           java-jwt
            3.4.0
        
        
        
            com.alibaba
            fastjson
            1.2.78
        

2.写一个JWT的工具类

import com.alibaba.fastjson.JSON;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.qcby.xmfs.boot.entity.User;
import lombok.extern.slf4j.Slf4j;

import java.util.*;

@Slf4j
public class JwtUtilBak {
    //过期时间 2min
    private static final int EXPIRE_TIME = 2;
    //私钥  自定义
    private static final String TOKEN_SECRET = "privateKey";

    // 普通常量
    private static final String CLAIM_USER = "claimUser";

    public static String createToken(User user) {
        Calendar nowTime = Calendar.getInstance();
        nowTime.add(Calendar.MINUTE,EXPIRE_TIME);
        Date expiresDate = nowTime.getTime();

        String userJson = JSON.toJSonString(user);
        return JWT.create()
                .withAudience(user.getId()+"")   //签发对象
                .withIssuedAt(new Date())    //发行时间
                .withExpiresAt(expiresDate)  //有效时间 
                // 存储用户信息   =>   json转化 ，序列化
                .withClaim(CLAIM_USER,userJson)  //载荷 => 附带信息：比如用户信息
                .sign(Algorithm.HMAC256(user.getId()+TOKEN_SECRET));   //加密
    }
    
    public static boolean verifyToken(String token, String secret) {
        try {
            JWTVerifier verifier = JWT.require(Algorithm.HMAC256(secret+TOKEN_SECRET)).build();
            verifier.verify(token);
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            //效验失败
            //自定义的一个异常
            return false;
        }
        return true;
    }
    
    public static String getAudience(String token)  {
        String audience = null;
        try {
            audience = JWT.decode(token).getAudience().get(0);
        } catch (Exception j) {
            log.error(j.getMessage(),j);
            return null;
        }
        return audience;
    }
    
    public static User getUser(String token)  {
        User user = null;
        try {
            String userJson  = JWT.decode(token).getClaim(CLAIM_USER).asString();
            user = JSON.parseObject(userJson,User.class);
        } catch (JWTDecodeException j) {
            log.error(j.getMessage(),j);
            return null;
        }
        return user;
    }
}