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这篇文章将为大家详细讲解有关如何使用Feign传递请求头信息，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

Feign传递请求头信息

在我之前的文章服务网关Spring Cloud Zuul中，将用户的登录id放在了请求头中传递给内部服务。

但是当内部服务之间存在feign调用时，那么请求头信息会在feign请求的时候传递吗？不会，请求的头信息和请求参数都不会进行传递。

但是我们可以通过通过实现RequestInterceptor接口,完成对所有的Feign请求,传递请求头和请求参数。

实现RequestInterceptor接口import feign.RequestInterceptor;import feign.RequestTemplate;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;import java.util.Enumeration;/** * Feign请求拦截器（设置请求头，传递登录信息） * * @author simon * @create 2018-09-07 9:51 **/public class FeignBasicAuthRequestInterceptor implements RequestInterceptor { @Override public void apply(RequestTemplate requestTemplate) { ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder .getRequestAttributes(); HttpServletRequest request = attributes.getRequest(); Enumeration headerNames = request.getHeaderNames(); if (headerNames != null) { while (headerNames.hasMoreElements()) { String name = headerNames.nextElement(); String values = request.getHeader(name); requestTemplate.header(name, values); } } }}

这里只设置了请求头，如果想传递请求参数，可以参考如下代码：

public class FeignBasicAuthRequestInterceptor implements RequestInterceptor { @Override public void apply(RequestTemplate requestTemplate) { ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder .getRequestAttributes(); HttpServletRequest request = attributes.getRequest(); Enumeration headerNames = request.getHeaderNames(); if (headerNames != null) { while (headerNames.hasMoreElements()) { String name = headerNames.nextElement(); String values = request.getHeader(name); requestTemplate.header(name, values); } } Enumeration bodyNames = request.getParameterNames(); StringBuffer body =new StringBuffer(); if (bodyNames != null) { while (bodyNames.hasMoreElements()) { String name = bodyNames.nextElement(); String values = request.getParameter(name); body.append(name).append("=").append(values).append("&"); } } if(body.length()!=0) { body.deleteCharAt(body.length()-1); template.body(body.toString()); logger.info("feign interceptor body:{}",body.toString()); } }}注册配置package com.southgis.ibase.personalConfigure.config;import com.southgis.ibase.utils.FeignBasicAuthRequestInterceptor;import com.southgis.ibase.utils.FeignSpringFormEncoder;import feign.RequestInterceptor;import feign.codec.Encoder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;/** * Feign配置注册（全局） * * @author simon * @create 2018-08-20 11:44 **/@Configurationpublic class FeignSupportConfig { /** * feign请求拦截器 * * @return */ @Bean public RequestInterceptor requestInterceptor(){ return new FeignBasicAuthRequestInterceptor(); }}

这个文件放在项目的扫描目录下，所有的feign调用都会使用此配置。如果只有某个feign调用则可以这样设置(但配置类不能在扫描目录下)：

@FeignClient(name = "organ",path = "/organ/OrganInfo",configuration = FeignSupportConfig.class)Feign调用微服务传递header请求头package com.chitic.module.core.config;import feign.RequestInterceptor;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;import java.util.Enumeration; @Configurationpublic class FeignConfig { @Bean public RequestInterceptor headerInterceptor() { return template -> { ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); if (null != attributes) { HttpServletRequest request = attributes.getRequest(); Enumeration headerNames = request.getHeaderNames(); if (headerNames != null) { while (headerNames.hasMoreElements()) { String name = headerNames.nextElement(); String values = request.getHeader(name); template.header(name, values); } } } }; }}

需注意，feign调用时不能调用含有HttpServletResponse参数（比如常用的数据导出），以下就不能远程调用，目前没找到解决办法

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