feign微服务之间的相互调用

本文章只是记录服务提供方、消费方的代码编写，配置什么的大家在网上搜，一大堆。

首先是服务提供方：

启动类上加上注解@EnableFeignClients，然后正常的写controller、service等业务逻辑

其次是服务的调用方：

1.首先启动类上加上注解@EnableFeignClients

2.编写服务调用接口

3.编写接口熔断处理方法

4.本人遇到的问题是需要用到调用方的请求头里面的信息，但是在提供方取不到，这时可以通过在调用方增加配置来解决

import feign.RequestInterceptor;
import feign.RequestTemplate;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

/**
 * @author ydf
 * @date 2021/5/13
 * @description:
 **/
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);
      }
    }
  }
}

import com.jingling.netsign.applet.interceptor.FeignBasicAuthRequestInterceptor;
import feign.RequestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author ydf
 * @date 2021/5/13
 * @description:
 **/
@Configuration
public class FeignSupportConfig {
  /**
   * feign请求拦截器
   *
   * @return
   */
  @Bean
  public RequestInterceptor requestInterceptor(){
    return new FeignBasicAuthRequestInterceptor();
  }
}