模拟生成jwt token

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最新推荐文章于 2025-05-24 17:20:19 发布

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本文链接：https://blog.youkuaiyun.com/pb951028/article/details/93726433

本文介绍了一种JWT工具类的实现方式，包括生成JWT-Token和解析Token获取对象的方法。通过示例展示了如何使用该工具类进行JWT-Token的生成与验证，适用于Java环境下基于JWT的身份验证流程。

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添加工具类

package com.pp.utils;

import com.auth0.jwt.JWTSigner;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.internal.com.fasterxml.jackson.databind.ObjectMapper;
import java.util.HashMap;
import java.util.Map;

public class JwtUtils {
	private static final String SECRET = "abc123!@#";
	private static final String EXP = "exp";
	private static final String PAYLOAD = "payload";

	public static <T> String getToken(T object, long maxAge) {
		try {
			final JWTSigner signer = new JWTSigner(SECRET);
			final Map<String, Object> claims = new HashMap<String, Object>();
			ObjectMapper mapper = new ObjectMapper();
			String jsonString = mapper.writeValueAsString(object);
			claims.put(PAYLOAD, jsonString);
			claims.put(EXP, System.currentTimeMillis() + maxAge);
			return signer.sign(claims);
		} catch (Exception e) {
			return null;
		}
	}

	public static <T> T getObject(String token, Class<T> classT) {
		final JWTVerifier verifier = new JWTVerifier(SECRET);
		try {
			final Map<String, Object> claims = verifier.verify(token);
			if (claims.containsKey(EXP) && claims.containsKey(PAYLOAD)) {
				long exp = (Long) claims.get(EXP);
				long currentTimeMillis = System.currentTimeMillis();
				if (exp > currentTimeMillis) {
					String json = (String) claims.get(PAYLOAD);
					ObjectMapper objectMapper = new ObjectMapper();
					return objectMapper.readValue(json, classT);
				}
			}
			return null;
		} catch (Exception e) {
			return null;
		}
	}
}

pom里添加jwt依赖

  	<!-- /java-jwt -->
	<dependency>
	    <groupId>com.auth0</groupId>
	    <artifactId>java-jwt</artifactId>
	    <version>2.2.2</version>
	</dependency>

模拟生成还原

package com.pp.utils;

import org.springframework.boot.SpringApplication;
import org.springframework.context.ApplicationContext;

import com.alibaba.fastjson.JSON;
import com.pp.Astart;
import com.pp.dao.UserMapper;
import com.pp.entity.User;

public class MyTester {
	public static void main(String[] args) throws InterruptedException {
		ApplicationContext context  = SpringApplication.run(Astart.class, args);
		UserMapper userMapper = context.getBean(UserMapper.class);
		User user = userMapper.selectByAccountAndPassword("ppbb1", "Aa1234").get(0);
		System.out.println("currentUser="+JSON.toJSONString(user));
		System.out.println("2秒后生成jwt-token");
		
		//模拟生成jwt-token
		Thread.sleep(2000);
		String token = JwtUtils.getToken(user, 6000);
		System.out.println("jwt-token"+token+"(6秒内有效)");
		
		//还原jwt-token
		User userx = JwtUtils.getObject(token, User.class);
		System.out.println("还原出user="+JSON.toJSONString(userx));
	}
}