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Spring Cloud Feign--统一设置Header--方法/实例


简介

        本文介绍Feign如何统一设置Header。

        Feign的用法和SpringMVC的用法基本一致。设置单个header的方法很简单,见:。本文只介绍全局设置header的方法。

方法概述

        方法是:实现RequestInterceptor接口,将它作为配置类。

        如果这个实现类注入到Spring容器的话就会全局有效,即使在没有指定configuration属性的FeignClient也会使用该配置。

        如果只想给指定FeignClient的feign接口使用该配置,不要将该类配置注入Spring中,需要进行手动指定(假设实现类名为:TestFeignIntercepter):

@FeignClient(name = "user", configuration = {TestRequestInterceptor.class})
public interface UserFeignClient {
@GetMapping(value = "/user/{id}")
public User findById(@RequestParam("id") String id);
}

简单示例

public class TestFeignInterceptor implements RequestInterceptor {
@Override
public void apply(RequestTemplate requestTemplate) {
String url = requestTemplate.url();
// 只对特定url进行签名添加Header的操作
if (!url.startsWith("/test/api")) {
return;
}

requestTemplate.header("Authorization", "xxx");
}
}

项目实例

实例1:转发Controller的所有header

import feign.RequestInterceptor;
import feign.RequestTemplate;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class FeignTransmitAllHeaderInterceptor implements RequestInterceptor {

@Override
public void apply(RequestTemplate template) {
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);
template.header(name, values);
}
}
}
}

实例2:转发Controller的header(修改部分header)

import feign.RequestInterceptor;
import feign.RequestTemplate;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class FeignTransmitAllHeaderInterceptor implements RequestInterceptor {

@Override
public void apply(RequestTemplate requestTemplate) {
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
if (requestAttributes != null) {
ServletRequestAttributes attributes = (ServletRequestAttributes)requestAttributes;
HttpServletRequest request = attributes.getRequest();
Enumeration<String> headerNames = request.getHeaderNames();
if (headerNames != null) {
while(headerNames.hasMoreElements()) {
String headerName; = (String)headerNames.nextElement();
String headerValue = request.getHeader(headerName);
if (!headerName.equals("content-length")) {
requestTemplate.header(headerName, headerValue);
}
}

String path = request.getContextPath();
String modifiedReferer = request.getScheme() + "://" + request.getServerName()
+ ":" + request.getServerPort() + path + request.getServletPath();
requestTemplate.header("referer", modifiedReferer);
}
}
}
}

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