1、引入jwt依赖
<!--jwt的依赖-->
<dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.18.3</version>
</dependency>2、创建TokenUtils工具类
package com.pn.utils;import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.pn.entity.CurrentUser;
import com.pn.entity.User; //实体类
import com.pn.exception.BusinessException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.ReactiveRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;import java.time.Duration;
import java.util.Date;/*** token工具类*/
@Component
public class TokenUtils {//注入redis模板@Autowiredprivate StringRedisTemplate stringRedisTemplate;Redis 0库// @Autowired// @Qualifier("reactiveRedisTemplateDb0")// private ReactiveRedisTemplate<String, Object> redis;//注入配置文件中的warehouse.expire-time属性 -- token的过期时间@Value("${warehouse.expire-time}")private Long expireTime;/*** 常量:*///token中存放用户id对应的名字private static final String CLAIM_NAME_USERID = "CLAIM_NAME_USERID";//token中存放用户名对应的名字private static final String CLAIM_NAME_USERCODE = "CLAIM_NAME_USERCODE";//token中存放用户真实姓名对应的名字private static final String CLAIM_NAME_USERNAME = "CLAIM_NAME_USERNAME";// 真正的生成的jwt token的方法private String sign(User user) {String token = JWT.create().withClaim(CLAIM_NAME_USERID, user.getUserId()).withClaim(CLAIM_NAME_USERCODE, user.getUserCode()).withClaim(CLAIM_NAME_USERNAME, user.getUserName()).withIssuedAt(new Date())//发行时间.withExpiresAt(new Date(System.currentTimeMillis() + (expireTime * 1000L)))//有效时间.sign(Algorithm.HMAC256(user.getUserPwd()));//指定签名return token;}/*** 方法一，jwt生成的 token存Redis，用Redis判断是否存在* 将当前用户信息以用户密码为密钥生成token的方法*/public String loginSign(User user){//生成tokenString token = sign(user);//将token保存到redis中,并设置token在redis中的过期时间//stringRedisTemplate.opsForValue().set(token, token, Duration.ofSeconds(28800)).subscribe();stringRedisTemplate.opsForValue().set(token, token, expireTime);return token;}/*** 方法二，解析前端jwt生成的token进行校验* 创建CurrentUser实体类接收* 从客户端归还的token中获取用户信息的方法*/public CurrentUser getCurrentUser(String token) {if(StringUtils.isEmpty(token)){throw new BusinessException("令牌为空，请登录！");}//对token进行解码,获取解码后的tokenDecodedJWT decodedJWT = null;try {decodedJWT = JWT.decode(token);} catch (JWTDecodeException e) {throw new BusinessException("令牌格式错误，请登录！");}//从解码后的token中获取用户信息并封装到CurrentUser对象中返回int userId = decodedJWT.getClaim(CLAIM_NAME_USERID).asInt();//用户账号idString userCode = decodedJWT.getClaim(CLAIM_NAME_USERCODE).asString();//用户账号String userName = decodedJWT.getClaim(CLAIM_NAME_USERNAME).asString();//用户姓名if(StringUtils.isEmpty(userCode) || StringUtils.isEmpty(userName)){throw new BusinessException("令牌缺失用户信息，请登录！");}return new CurrentUser(userId, userCode, userName);}}
3、使用
// 注入token对象@Autowiredprivate TokenUtils tokenUtils;@RequestMapping("/login")public String login(@RequestBody LoginUser loginUser) {// 生成tokenString token = tokenUtils.loginSign("传入实体类");System.out.println(token);return token ;}
