SpringCloud Alibaba-Nacos注册中心与SpringCloud-OpenFeign远程调用测试

一. SpringCloud Alibaba-Nacos注册中心

1. 本地安装下载Nacos Server(目前最新1.3.2)
   （1）https://github.com/alibaba/nacos/releases
   （2）Windows 操作系统，执行命令 cmd startup.cmd
   
   注意：如果启动不了，请修改启动模式为standalone

2. pom文件中引入Nacos Discovery Starter

 
     com.alibaba.cloud
     spring-cloud-starter-alibaba-nacos-discovery
 

3. application.yml配置文件中配置Nacos Server地址

spring:
  application:
    name: gulimall-coupon
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

4. 使用 @EnableDiscoveryClient 注解开启服务注册与发现功能

@EnableDiscoveryClient
@SpringBootApplication
public class GulimallCouponApplication {

    public static void main(String[] args) {
        SpringApplication.run(GulimallCouponApplication.class, args);
    }
}

5. 启动项目，浏览器中输入http://127.0.0.1:8848/nacos/ 即可进入管理页面
   

二. SpringCloud-OpenFeign远程调用

1. @FeignClient创建要远程调用的服务的接口

package com.atguigu.gulimall.member.feign;

import com.atguigu.common.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author QuS
 * @date 2020/9/4 11:07
 */
@FeignClient("gulimall-coupon")
public interface CouponFeignService {

    /**
     * 测试feign远程调用，与远程的RequestMapping地址和方法名一致
     *
     * @return
     */
    @RequestMapping("/coupon/coupon/member/list")
    R memberCoupons();
}

@FeignClient 注解将 CouponFeignService这个接口包装成一个 FeignClient，属性 name 对应注册进的服务名gulimall-coupon；

2. 在启动类中加入@EnableFeignClients

package com.atguigu.gulimall.member;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients(basePackages = "com.atguigu.gulimall.member.feign")
@EnableDiscoveryClient
@SpringBootApplication
public class GulimallMemberApplication {

    public static void main(String[] args) {
        SpringApplication.run(GulimallMemberApplication.class, args);
    }
}

basePackages指向远程调用服务的类所在的包路径

3. 将CouponFeignService加入Controller中进行测试

原文：https://github.com/alibaba/spring-cloud-alibaba/blob/master/spring-cloud-alibaba-examples/nacos-example/nacos-discovery-example/readme-zh.md