简单实验 java spring cloud 自定义负载均衡

1.概要

1.1 说明

这个是在前一个测试上的修改，所以这里只体现修改的内容。前一个测试的地址：检查实验 spring cloud nacos nacos-server-2.3.0-CSDN博客

1.2 记忆要点

1.2.1 引入对象

@Autowired
DiscoveryClient discoveryClient;

1.2.2 获取服务实例 

List<ServiceInstance> serviceInstances = discoveryClient.getInstances("server3");
int index = new Random().nextInt(serviceInstances.size());
ServiceInstance serviceInstance = serviceInstances.get(index);

1.2.3 利用服务实例调用函数 

String url = "http://"+serviceInstance.getHost()+":"+serviceInstance.getPort()+"/fun";

2.代码变更

package com.xjc.springcloundtest;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;import java.util.List;
import java.util.Random;@RestController
public class TestController2 {@AutowiredDiscoveryClient discoveryClient;//@Autowired//FenTest fenTest;@AutowiredRestTemplate restTemplate;@RequestMapping("/fun2")public String fun2(){List<ServiceInstance> serviceInstances = discoveryClient.getInstances("server3");int index = new Random().nextInt(serviceInstances.size());ServiceInstance serviceInstance = serviceInstances.get(index);//String url = "http://localhost:8080/fun";//String url = "http://server3/fun";String url = "http://"+serviceInstance.getHost()+":"+serviceInstance.getPort()+"/fun";//String ret = fenTest.fun();String ret = restTemplate.getForObject(url,String.class);return "函数2"+ret;}
}

3 运行结果