Feign远程调用丢失请求头问题

本是古典何须时尚 2022-12-06 15:49 208阅读 0赞

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70 1][]

**feign默认构造的template中header没有数据 **

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70 2][]

解决:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70 3][] 参考[https://mp.csdn.net/console/editor/html/104254815][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;

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70]: /images/20221123/d342072bcabb43bdb9c6bd8b27cb1290.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTQwMjA1_size_16_color_FFFFFF_t_70 3]: /images/20221123/028525a97d5149889d52de781ccf5065.png
[https_mp.csdn.net_console_editor_html_104254815]: https://mp.csdn.net/console/editor/html/104254815