SpringCloud中使用Nacos集成的Ribbon实现负载均衡

梦里梦外; 2023-02-24 15:28 18阅读 0赞

## 1.创建一个SpringBoot父工程(SpringBoot的版本是2.2.6) ##

配置父工程的pom.xml文件

添加依赖

<dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Hoxton.SR4</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
                <dependency>
                    <groupId>com.alibaba.cloud</groupId>
                    <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                    <version>2.1.0.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>

修改<parent>标签的内容，把springboot的版本修改为2.2.6

<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.6.RELEASE</version>
            <relativePath/> 
        </parent>

## 2.创建3个子工程，这个3个子工程必须是maven工程 ##

分别命名 provider10001 , provider10002 , consumer100

我们在provider10001 和 provider10002 以及 consumer100 工程添加以下依赖

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.8</version>
                <scope>provided</scope>
            </dependency>
    </dependencies>

在provider10001 和 provider10002 工程配置application.yml文件

前提要配置nacos集群，或者单机版的nacos，详见：[https://blog.csdn.net/Xeon\_CC/article/details/107066278][https_blog.csdn.net_Xeon_CC_article_details_107066278]

server:
      port: 10001(10002)
    
    spring:
      application:
        name: nacos-provider
      cloud:
        nacos:
          discovery:
            server-addr: 192.168.31.201:8848,192.168.31.202:8848,192.168.31.203:8848
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'

## 3.provider10001和provider10002工程中，创建主启动类和controller类 ##

主启动类分别是：

要加上@EnableDiscoveryClient注解让Nacos服务注册中心起作用

@SpringBootApplication
    @EnableDiscoveryClient
    public class ProviderApplication10001 {//另一个是ProviderApplication10002类
        public static void main(String[] args){
            SpringApplication.run(ProviderApplication10001.class,args);
        }
    
    }

controller类是一模一样的

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;
    
    @RestController
    public class ProviderController {
        @Value("${server.port}")
        private String serverPort;
    
        @GetMapping(value = "/provider/nacos/{id}")
        public String getPayment(@PathVariable("id")Integer id){
            return "nacos registry, serverPort: " + serverPort + "\t id" + id;
        }
    
    }

## 4.配置consumer100工程 ##

创建主启动类（废话）

@SpringBootApplication
    @EnableDiscoveryClient
    public class ConsumerApplication100 {
        public static void main(String[] args){
            SpringApplication.run(ConsumerApplication100.class,args);
        }
    }

配置application.yml文件

server:
      port: 100
    
    spring:
      application:
        name: nacos-consumer
      cloud:
        nacos:
          discovery:
            server-addr: 192.168.31.201:1111    #我这里设置了反向代理去访问nacos集群，你可以选择不使用反向代理，可用单机版，可用集群
      profiles:
        active: dev
    #消费者将要去访问的微服务名称（注册成功进入nacos的微服务提供者）
    service-url:
      nacos-user-service: http://nacos-provider

在consumer100工程创建config包，在config包下创建ApplicationContextConfig类

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;
    
    @Configuration
    public class ApplicationContextConfig {
        @Bean
        @LoadBalanced
        public RestTemplate getRestTemplate(){
            return new RestTemplate();
        }
    }

consumer100工程下创建controller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;
    import org.springframework.web.client.RestTemplate;
    
    import javax.annotation.Resource;
    
    @RestController
    public class ConsumerController{
        @Resource
        private RestTemplate restTemplate;
    
        @Value("${service-url.nacos-user-service}")
        private String serverURL;
    
        @GetMapping(value = "/consumer/nacos/{id}")
        public String paymentInfo(@PathVariable("id") Long id){
            return restTemplate.getForObject(serverURL + "/provider/nacos/"+id,String.class);
        }
    
    }

## 5.测试 ##

地址栏不变，刷新，端口号不断变化切换

![2020070921443955.png][]

![20200709214447586.png][]

[https_blog.csdn.net_Xeon_CC_article_details_107066278]: https://blog.csdn.net/Xeon_CC/article/details/107066278
[2020070921443955.png]: /images/20230209/b6f202d098314574baa2032a32b61cba.png
[20200709214447586.png]: https://img-blog.csdnimg.cn/20200709214447586.png