使用Feign传递请求头信息(Finchley版本)
作者：AaronSimon
这篇文章主要介绍了使用Feign传递请求头信息(Finchley版本)，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
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<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：
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
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)：
@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;
@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脚本之家。