在我之前的文章服務網關Spring Cloud Zuul中，將用戶的登錄id放在了請求頭中傳遞給內部服務。但是當內部服務之間存在feign調用時，那麼請求頭信息會在feign請求的時候傳遞嗎？不會，請求的頭信息和請求參數都不會進行傳遞。但是我們可以通過通過實現RequestInterceptor接口,完成對所有的Feign請求,傳遞請求頭和請求參數。
1. 實現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請求攔截器（設置請求頭，傳遞登錄信息）
*
* @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);
}
}
}
}
這裏只設置了請求頭，如果想傳遞請求參數，可以參考如下代碼：
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());
}
}
}
2. 註冊配置
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配置註冊（全局）
*
* @author simon
* @create 2018-08-20 11:44
**/
@Configuration
public class FeignSupportConfig {
/**
* feign請求攔截器
*
* @return
*/
@Bean
public RequestInterceptor requestInterceptor(){
return new FeignBasicAuthRequestInterceptor();
}
}
這個文件放在項目的掃描目錄下，所有的feign調用都會使用此配置。如果只有某個feign調用則可以這樣設置(但配置類不能在掃描目錄下)：
@FeignClient(name = "organ",path = "/organ/OrganInfo",configuration = FeignSupportConfig.class)