Feign远程调用丢失请求头问题

feign默认构造的template中header没有数据 

解决:

 参考https://mp.csdn.net/console/editor/html/104254815

package com.java.gulimall.order.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * @author jl
 * Created on 2020/9/14
 */
@Configuration
public class GuliFeignConfig {

    @Bean("requestInterceptor")
    public RequestInterceptor requestInterceptor() {
        return new RequestInterceptor() {
            @Override
            public void apply(RequestTemplate template) {
                //1、使用RequestContextHolder拿到刚进来的请求数据
                ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                if (requestAttributes != null) {
                    //老请求
                    HttpServletRequest request = requestAttributes.getRequest();
                    if (request != null) {
                        //2、同步请求头的数据（主要是cookie）
                        //把老请求的cookie值放到新请求上来，进行一个同步
                        String cookie = request.getHeader("Cookie");
                        template.header("Cookie", cookie);
                    }
                }
            }
        };
    }
}

如果是在异步方法中调用feign会出现HttpServletRequest request = requestAttributes.getRequest()为null的情况,需要先获取主线程的request,再设置到子线程

 public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {
        OrderConfirmVo orderConfirmVo = new OrderConfirmVo();
        MemberResponseVo memberResponseVo = LoginInterceptor.loginUser.get();

        // 由于开启了新的线程,不能获取当前线程的session,需要设置到子线程中
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        // 使用异步编排提高效率
        CompletableFuture<Void> getAddress = CompletableFuture.runAsync(() -> {
            // 设置子线程的request
            RequestContextHolder.setRequestAttributes(requestAttributes);
            // 收货地址
            List<MemberAddressVo> address = memberFeignService.getAddress(memberResponseVo.getId());
            orderConfirmVo.setAddressVos(address);
        }, executor);

        CompletableFuture<Void> currentUserCartItem = CompletableFuture.runAsync(() -> {
            // 设置子线程的request
            RequestContextHolder.setRequestAttributes(requestAttributes);
            // 获取当前用户的购物车商品项
            List<OrderItemVo> orderItemVos = cartFeignService.currentUserCartItem();
            orderConfirmVo.setItems(orderItemVos);
        }, executor);

        // 积分
        Integer integration = memberResponseVo.getIntegration();
        orderConfirmVo.setIntegration(integration);
        // 价格自动计算
        // 防重令牌

        CompletableFuture.allOf(getAddress,currentUserCartItem).get();
        return orderConfirmVo;