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项目场景：

SpringBoot拦截器获取token用户对象优雅地传递到Controller层

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问题描述

后端有许多接口都需要请求中携带有正确的Token，这时采用拦截器来验证token，但是每个接口都还是需要解析一遍token，浪费资源，不免显得代码繁琐,臃肿。

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解决方案：

我们可以把用户信息存储起来，方便其它地方获取，两种方式：

1. 使用ThreadLocal线程存储（推荐）
2. 存储到上下文中request.setAttribute

1、自定义拦截器Interceptor

抛出的异常需要自己捕捉，返回

package com.test.aop;import com.test.entity.TokenUserInfo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Token拦截器*/
@Component
@Slf4j
public class TokenInterceptor implements HandlerInterceptor {/*** 存储用户信息*/private static ThreadLocal<TokenUserInfo> userThread = new ThreadLocal<>();@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 从header中获取tokenString token = request.getHeader(CommonConstant.ACCESS_TOKEN);// 如果参数中不存在token，则报错if (StringUtils.isBlank(token)) {throw new RuntimeException("请求头缺少token参数");}try {// TODO 根据token获取用户信息// ......}catch (Exception e){log.error("获取用户信息失败:", e);throw new RuntimeException("获取用户信息失败");}//模拟已经获取到了用户信息TokenUserInfo tokenUserInfo = new TokenUserInfo();tokenUserInfo.setUserId("1227086153ef415896da5819d4fb4c2f");tokenUserInfo.setLoginAccount("test");tokenUserInfo.setLoginUserName("测试");//token失效if(tokenUserInfo == null){throw new RuntimeException("token失效");}/** 存储用户信息方便其它地方获取，两种方式* 1.使用ThreadLocal线程存储（推荐）* 2.存储到上下文中request.setAttribute*/// 放入线程域userThread.set(tokenUserInfo);//2.存储到上下文中request.setAttribute
//        request.setAttribute("tokenUserInfo",tokenUserInfo);//放行return true;}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {//程序运行结束之后，删除线程，防止内存泄漏userThread.remove();}public static TokenUserInfo getUser() {return userThread.get();}}

用户实体类

package com.test.entity;import lombok.Data;/*** 用户信息**/
@Data
public class TokenUserInfo {/*** 用户id*/private String userId;/*** 登录帐号*/private String loginAccount;/*** 用户名*/private String loginUserName;
}

2、配置拦截器

package com.test.config;import com.test.aop.TokenInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;/*** WebMvc配置*/
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {/*** 解决跨域问题*/@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS").maxAge(3600);}@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");registry.addResourceHandler("/swagger/**").addResourceLocations("classpath:/static/swagger/");registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");}@Resourceprivate TokenInterceptor tokenInterceptor;@Overridepublic void addInterceptors(InterceptorRegistry registry) {//不拦截的地址List<String> excludedList = new ArrayList<>();//swagger地址excludedList.add("/swagger-ui.html");excludedList.add("/swagger-ui.html/**");excludedList.add("/webjars/**");excludedList.add("/swagger/**");excludedList.add("/doc.html");excludedList.add("/doc.html/**");excludedList.add("/swagger-resources/**");excludedList.add("/v2/**");excludedList.add("/favicon.ico");registry.addInterceptor(tokenInterceptor).addPathPatterns("/**")//拦截所有请求.excludePathPatterns(excludedList);//排除的请求super.addInterceptors(registry);}
}

 3、Controller层获取

package com.test.controller;import com.test.aop.TokenInterceptor;
import com.test.entity.TokenUserInfo;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;@RestController
@Api(tags = "测试接口")
@RequestMapping("/test")
public class TestController {@RequestMapping(value = "/get", method = RequestMethod.GET)public String get(HttpServletRequest request) {/** 优雅的获取用户信息，两种方式* 1.使用ThreadLocal线程存储（推荐）* 2.存储到上下文中request.setAttribute*/TokenUserInfo tokenUserInfo = TokenInterceptor.getUser();
//		TokenUserInfo tokenUserInfo = (TokenUserInfo) request.getAttribute(CommonConstant.USER_INFO);return "success";}
}

参考源码：https://download.csdn.net/download/u011974797/85849196