Feign：

• 声明式REST客户端（伪RPC）
• 采用了基于接口的注解

第一步：添加依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>

第二步：添加注解

package com.example.order;

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

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class OrderApplication {

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

}

第三步：定义调用的接口

package com.example.order.client;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * product:被调用的serverID
 * /msg:被调用的接口名
 * productMsg:自定义接口名
 *
 * @Author hy
 * @Date 2018/12/25 15:26
 **/
@FeignClient(name = "product")
public interface ProductClient {

    @RequestMapping("/msg")
    String productMsg();

}

第四步：使用

package com.example.order.controller;

import com.example.order.client.ProductClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ClientController {

 /*   @Autowired
    private RestTemplate RestTemplate;

    @RequestMapping("/getMsg")
    public String getMsg(){
        String msg = RestTemplate.getForObject("http://PRODUCT/msg",String.class);
        return msg;
    }*/
    @Autowired
    private ProductClient productClient;

     @RequestMapping("/getMsg")
     public String getMsg(){
         String result = productClient.productMsg();
         System.out.println(result);
         return result;
     }

}

第五步：启动测试：成功

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