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
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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<String> 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:
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public class FeignBasicAuthRequestInterceptor 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); } } Enumeration<String> 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
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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 **/ @Configuration public 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):
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@FeignClient (name = "organ" ,path = "/organ/OrganInfo" ,configuration = FeignSupportConfig. class ) |
Feign调用微服务传递header请求头
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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; @Configuration public class FeignConfig { @Bean public RequestInterceptor headerInterceptor() { return template -> { ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); if ( null != attributes) { 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); } } } }; } } |
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
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://www.jianshu.com/p/919d066a07aa