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【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 {
}