现象

解决方案

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;/*** @Description: feign拦截器功能* @Created: with IntelliJ IDEA.* @author: 夏沫止水* @createTime: 2020-07-02 21:10**/@Configuration
public class GuliFeignConfig {@Bean("requestInterceptor")public RequestInterceptor requestInterceptor() {RequestInterceptor requestInterceptor = new RequestInterceptor() {@Overridepublic 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);}}}};return requestInterceptor;}}

以上可以解决同步调用问题

如果使用异步处理远程调用

如果是异步调用，则在线程池中使用其他线程，这样就是的新建的线程和之前的老线称没丝毫关系了

解决方案：
在上面方案的基础上，然后再后面异步调用的时候添加上老请求信息