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一、基于Nacos的服务提供者

服务提供方 (Service Provider)

1. 在父工程下新建module (cloudalibaba-provider-payment-9001）
2. POM 引入

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

3. YML

server:  port: 9001spring:  application:    name: nacos-payment-provider  cloud:    nacos:      discovery:        server-addr: 172.28.129.83:8848 #配置Nacos地址management:  endpoints:    web:      exposure:        include: '*'

4. 主启动

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClientpublic class PaymentApplication9001 {
       public static void main(String[] args) {
           SpringApplication.run(PaymentApplication9001.class,args);    }}

5. 业务类

import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class PaymentController{
       @Value("${server.port}")    private String serverPort;    @GetMapping(value = "/payment/nacos/{id}")    public String getPayment(@PathVariable("id") Integer id)    {
           return "nacos registry, serverPort: "+ serverPort+"\t id"+id;    }}

6.测试

• 启动9001服务

二、 基于Nacos的服务消费者

服务消费方 (Service Consumer)

• 根据9001新建一个9002module （cloudalibaba-provider-payment-9002）
• yml端口9001修改成9002
• 启动9002服务
• 刷新nacos,发现
• 
  

1、nacos自带负载均衡演示

• 新建Module （cloudalibaba-consumer-nacos-order-83）
• POM
• YML

server:  port: 83spring:  application:    name: nacos-order-consumer  cloud:    nacos:      discovery:        server-addr: 172.28.129.83:8848#消费者将要去访问的微服务名称(注册成功进nacos的微服务提供者)service-url:  nacos-user-service: http://nacos-payment-provider

• 主启动类

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClientpublic class OrderNacosApplication83 {
       public static void main(String[] args) {
           SpringApplication.run(OrderNacosApplication83.class,args);    }}

• 业务类
  新建包config 下新建类ApplicationContextConfig

import org.springframework.cloud.client.loadbalancer.LoadBalanced;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.client.RestTemplate;@Configurationpublic class ApplicationContextConfig {
       @Bean    @LoadBalanced  //负载均衡    public RestTemplate restTemplate(){
           return new RestTemplate();    }}

新建controller包，新建类OrderNacosController

import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;import javax.annotation.Resource;@RestController@Slf4jpublic class OrderNacosController{
       @Resource    private RestTemplate restTemplate;    //从配置文件中读取出来    @Value("${service-url.nacos-user-service}")    private String serverURL;    @GetMapping(value = "/consumer/payment/nacos/{id}")    public String paymentInfo(@PathVariable("id") Long id)    {
           return restTemplate.getForObject(serverURL+"/payment/nacos/"+id,String.class);    }}

• 测试
• 输入消费服务端口
  http://localhost:83/consumer/payment/nacos/1
  刷新一次切换9001或者9002，所以得出结论，83访问9001/9002，轮询负载OK
  
  
  消费者83成功注册到nacos
  
  

为什么Nacos支持负载均衡，因为他整合了ribbon

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