使用Feign传递请求头信息(Finchley版本) 使用Feign传递请求头信息(Finc

Feign传递请求头信息

实现RequestInterceptor接口
注册配置

Feign调用微服务传递header请求头

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 {@Overridepublic 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 {@Overridepublic 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*/@Beanpublic 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 {@Beanpublic 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