spring boot 2.0 ribbon 负载均衡配置

1.pom.xml

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>2.0..RELEASE</version>
        </dependency>

2.入口文件：UserConsumerDemoApplication.java

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);
    }
}

3.UserRibbonController.java

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;
    }
}