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)
