---

1.JWT依赖

<!-- JWT -->
<dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.10.3</version></dependency>
<!-- hutool  -->
<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.20</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.2</version>
</dependency>

2.JWT工具类TokenUtils.java

package com.example.springboot.utils;import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.example.springboot.entity.User;
import com.example.springboot.service.IUserService;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;@Component
public class TokenUtils {private static IUserService staticUserService;@Resourceprivate IUserService userService;@PostConstructpublic void setUserService() {staticUserService = userService;}/*** 生成token** @return*/public static String genToken(String userId, String sign) {return JWT.create().withAudience(userId) // 将 user id 保存到 token 里面,作为载荷.withExpiresAt(DateUtil.offsetHour(new Date(), 2)) // 2小时后token过期.sign(Algorithm.HMAC256(sign)); // 以 password 作为 token 的密钥}/*** 获取当前登录的用户信息** @return user对象*/public static User getCurrentUser() {try {HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();String token = request.getHeader("token");if (StrUtil.isNotBlank(token)) {String userId = JWT.decode(token).getAudience().get(0);return staticUserService.getById(Integer.valueOf(userId));}} catch (Exception e) {return null;}return null;}
}

3.token示例

{"username":"admin","password":"admin","nickname":"管理员11111","avatarUrl":"https://img-blog.csdnimg.cn/c6d0ece75d3f4833bd820b8aa2eb952b.png","token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJhdWQiOiIxIiwiZXhwIjoxNjQ0MzgxMDI4fQ.87nwS8ENDOu6RY-4PTLBBzXfDv6-5TiQLQhBXrYGb700"}

4.拦截器JwtInterceptor.java

package com.example.springboot.config.interceptor;import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.example.springboot.common.Constants;
import com.example.springboot.entity.User;
import com.example.springboot.exception.ServiceException;
import com.example.springboot.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class JwtInterceptor implements HandlerInterceptor {@Autowiredprivate IUserService userService;@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {String token = request.getHeader("token");// 如果不是映射到方法直接通过if(!(handler instanceof HandlerMethod)){return true;}// 执行认证if (StrUtil.isBlank(token)) {throw new ServiceException(Constants.CODE_401, "无token，请重新登录");}// 获取 token 中的 user idString userId;try {userId = JWT.decode(token).getAudience().get(0);} catch (JWTDecodeException j) {throw new ServiceException(Constants.CODE_401, "token验证失败，请重新登录");}// 根据token中的userid查询数据库User user = userService.getById(userId);if (user == null) {throw new ServiceException(Constants.CODE_401, "用户不存在，请重新登录");}// 用户密码加签验证 tokenJWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(user.getPassword())).build();try {jwtVerifier.verify(token); // 验证token} catch (JWTVerificationException e) {throw new ServiceException(Constants.CODE_401, "token验证失败，请重新登录");}return true;}
}

5.拦截器设置InterceptorConfig.java

package com.example.springboot.config;import com.example.springboot.config.interceptor.JwtInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class InterceptorConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(jwtInterceptor()).addPathPatterns("/**")  // 拦截所有请求，通过判断token是否合法来决定是否需要登录.excludePathPatterns("/api/user/login", "/api/user/register", "/**/export", "/**/import");}@Beanpublic JwtInterceptor jwtInterceptor() {return new JwtInterceptor();}
}

6.统一接口WebConfig.java

package com.example.springboot.config;/*** @Author SunPeng* @Date 2022/10/31 20:26* @description 请输入描述*/
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements  WebMvcConfigurer {@Overridepublic void configurePathMatch(PathMatchConfigurer configurer) {// 指定controller统一的接口前缀configurer.addPathPrefix("/api", clazz -> clazz.isAnnotationPresent(RestController.class));}
}

7.设置自定义头配置 CorsConfig .java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;@Configuration
public class CorsConfig {@Beanpublic CorsFilter corsFilter() {UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();CorsConfiguration corsConfiguration = new CorsConfiguration();corsConfiguration.addAllowedOrigin("*"); // 1 设置访问源地址corsConfiguration.addAllowedHeader("*"); // 2 设置访问源请求头corsConfiguration.addAllowedMethod("*"); // 3 设置访问源请求方法source.registerCorsConfiguration("/**", corsConfiguration); // 4 对接口配置跨域设置return new CorsFilter(source);}
}

8.GlobalExceptionHandler.java

package com.example.springboot.exception;import com.example.springboot.common.Result;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;/*** @Author SunPeng* @Date 2022/10/28 14:56* @description 请输入描述*/
@ControllerAdvice
public class GlobalExceptionHandler {/*** 如果抛出的的是ServiceException，则调用该方法* @param se 业务异常* @return Result*/@ExceptionHandler(ServiceException.class)@ResponseBodypublic Result handle(ServiceException se){return Result.error(se.getCode(), se.getMessage());}
}

9.ServiceException.java

package com.example.springboot.exception;import lombok.Getter;/*** @Author SunPeng* @Date 2022/10/28 14:58* @description 自定义异常*/
@Getter
public class ServiceException extends RuntimeException{private String code;public ServiceException(String code,String msg){super(msg);this.code=code;}
}

10.设置token:

String token=TokenUtils.genToken(one.getId().toString(),one.getPassword());
userDTO.setToken(token);

11.最终效果：