Java JWT 加密解密

加解密工具类.java

package com.diaolizhi.mybatisdemo.utils;

import com.diaolizhi.mybatisdemo.domain.User;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;


import java.util.Date;

/**
 * @program: mybatis-demo
 * @description: 用户 JWT 加密解密工具
 * @author: diaolizhi
 * @create: 2018-11-18 21:37
 **/
public class UserJWTUtils {

    private final static String SUBJECT = "dlz";

    private final static long EXPIRE = 1000*60*60*24*7;

    private final static String APPSECRET = "dlz123";

    public static String geneUserJsonToken(User user) {

        if(user == null || user.getId() == null || user.getUsername() == null || user.getCity() == null) {
            return null;
        }

        String token = Jwts.builder()
//                设置发布者
                .setSubject(SUBJECT)
//                添加信息，不能添加敏感信息
                .claim("id", user.getId())
                .claim("username", user.getUsername())
                .claim("city", user.getCity())
//                设置开始时间
                .setIssuedAt(new Date())
//                设置过期时间
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
//                设置加密算法和密钥
                .signWith(SignatureAlgorithm.HS256, APPSECRET)
                .compact();

        return token;
    }

    public static Claims checkJWTToken(String token) {

        try {
            final Claims claims = Jwts.parser()
                    .setSigningKey(APPSECRET)
                    .parseClaimsJws(token)
                    .getBody();
            return claims;
        } catch (Exception e) { }

        return null;
    }

}

测试用例.java

package com.diaolizhi.mybatisdemo;

import com.diaolizhi.mybatisdemo.domain.User;
import com.diaolizhi.mybatisdemo.utils.UserJWTUtils;
import io.jsonwebtoken.Claims;
import org.junit.Test;

/**
 * @program: mybatis-demo
 * @description: 测试 JWT
 * @author: diaolizhi
 * @create: 2018-11-18 21:51
 **/
public class JWTTest {

    @Test
    public void testJWT() {
        User user = new User();
        user.setId(66);
        user.setUsername("赵六");
        user.setCity("广西");

        String token = UserJWTUtils.geneUserJsonToken(user);
        System.out.println(token);
    }

    @Test
    public void testCheckJWT() {

        String token = "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJkbHoiLCJpZCI6NjYsInVzZXJuYW1lIjoi6LW15YWtIiwiY2l0eSI6IuW5v-ilvyIsImlhdCI6MTU0MjU0OTE4OCwiZXhwIjoxNTQzMTUzOTg4fQ.81rZO_SHU0dbKf8QQxRBUrK-5txD-LGD3OimHeePihE";

        Claims claims = UserJWTUtils.checkJWTToken(token);
        if (claims != null) {
            User user = new User();
            user.setId((Integer) claims.get("id"));
            user.setUsername((String) claims.get("username"));
            user.setCity((String) claims.get("city"));
            System.out.println(user);
        } else {
            System.out.println("非法 token");
        }


    }

}

添加依赖.xml

<!-- JWT相关 -->
<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.7.0</version>
</dependency>