我們在SpringCloud中使用Feign請求另一個服務的Api介面時，有將Header中參數傳遞下去的需求，如果不做特殊處理，就會將Header中的參數遺失。
方案一：透過 @RequestHeader(name = "headerName") 來傳遞
例如：Feign定義如下
@FeignClient(name = "service-name")
public interface XXXFeignClient {
@RequestMapping(value = "/user/getUserTicket", method = RequestMethod.GET)
String getUserTicket(@RequestParam("id") String id);
}假設在服務service-name中的/user/getUserTicket介面需要從Header中取Referer數據，那麼我們可以將上面程式碼進行改造：
@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);
}然後在呼叫的時候將referer參數傳遞進去即可，如
public String getTicketById(@RequestParam("id") String id, HttpServletRequest request) {
String referer = request.getHeader("Referer");
return xxxFeignClient.getUserTicket(id, referer);
}方案二：透過實作 RequestInterceptor 介面
首先，自訂實作RequestInterceptor介面的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);
}
}
}
}接著將自訂的設定類別配置到Feign中，就可以實現該Feign中介面Header參數的傳遞
@FeignClient(value = "service-name" ,configuration = FeignConfiguration.class)
public interface XXXFeignClient {
}以上是SpringBoot怎麼透過Feign呼叫傳遞Header中參數的詳細內容。更多資訊請關注PHP中文網其他相關文章！
