SpringBoot如何通过Feign调用传递Header中参数

【SpringBoot】通过Feign调用传递Header中参数

如何通过Feign传递Header参数

问题描述

我们在SpringCloud中使用Feign请求另一个服务的Api接口时，有将Header中参数传递下去的需求，如果不做特殊处理，就会将Header中的参数丢失。

解决方案

方案一：通过 @RequestHeader(name = "headerName") 来传递

例如：Feign定义如下

@FeignClient(name = "service-name")
public interface XXXFeignClient {
   @RequestMapping(value = "/user/getUserTicket", method = RequestMethod.GET)
   String getUserTicket(@RequestParam("id") String id);
}

假设在服务service-name中的/user/getUserTicket接口需要从Header中取Referer数据，那么我们可以将上面代码进行改造：

@FeignClient(name = "service-name")
public interface XXXFeignClient {
   @RequestMapping(value = "/user/getUserTicket", method = RequestMethod.GET)
   String getUserTicket(@RequestParam("id") String id, @RequestHeader(name = "Referer") String referer);
}

然后在调用的时候将referer参数传递进去即可，如

public String getTicketById(@RequestParam("id") String id, HttpServletRequest request) {
       String referer = request.getHeader("Referer");
       return xxxFeignClient.getUserTicket(id, referer);
   }

方案二：通过实现 RequestInterceptor 接口

 首先，自定义实现RequestInterceptor接口的apply方法，如下

import org.springframework.stereotype.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
@Configuration
public class FeignConfiguration implements RequestInterceptor {
   @Override
   public void apply(RequestTemplate requestTemplate) {
       ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
               .getRequestAttributes();
       HttpServletRequest request = attributes.getRequest();
       Enumeration<String> headerNames = request.getHeaderNames();
       if (headerNames != null) {
           while (headerNames.hasMoreElements()) {
               String name = headerNames.nextElement();
               String values = request.getHeader(name);
               requestTemplate.header(name, values);
           }
       }
   }
}

 然后将自定义的配置类配置到Feign中，就可以实现该Feign中接口Header参数的传递

@FeignClient(value = "service-name" ,configuration = FeignConfiguration.class)
   public interface XXXFeignClient {
   }

来源：https://www.cnblogs.com/cheng2839/p/14715057.html