<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>

            <version>2.0..RELEASE</version>

        </dependency>

package cn.itcast.user;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;

import org.springframework.context.annotation.Bean;

import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;

import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient

@SpringBootApplication

public class UserConsumerDemoApplication {

    @Bean

    @LoadBalanced  //负载均衡

    public RestTemplate restTemplate() {

        // 这次我们使用了OkHttp客户端,只需要注入工厂即可

        return new RestTemplate(new OkHttp3ClientHttpRequestFactory());

    }

    public static void main(String[] args) {

        SpringApplication.run(UserConsumerDemoApplication.class, args);

    }

}

package cn.itcast.user.controller;

import cn.itcast.user.pojo.User;

import com.netflix.ribbon.Ribbon;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.cloud.client.ServiceInstance;

import org.springframework.cloud.client.discovery.DiscoveryClient;

import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController

@RequestMapping("consumerRobbon")

public class UserRobbonController {

    @Autowired

    private RestTemplate restTemplate;

    @GetMapping("{id}")

    public User queryUserById(@PathVariable("id") Long id){

        String url = "http://user-service/user/" + id;

        User user = restTemplate.getForObject(url, User.class);

        return  user;

    }

}