Springcloud学习（四）Springcloud客户端作为消费者自动负载均衡调用service

Springcloud客户端作为消费者自动负载均衡调用service

• 服务提供者即生产者是支持在用户量较大的情况下，可能会挂掉，因此多节点支持成为必然。
• 本文描述客户端调用服务时，如果多个生产者将使用ribbon负载均衡交替调用。
• 代码地址https://github.com/Jacwo/eureka-server-customer 欢迎start 

开始

1. 使用idea新建一个maven项目 可以使用spring Initializr
2. 替换pom.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
   
       <groupId>com.yyl</groupId>
       <artifactId>eureka-server-customer</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <name>eureka-server-customer</name>
       <description>Demo project for Spring Boot</description>
   
       <parent>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-parent</artifactId>
           <version>1.5.9.RELEASE</version>
           <relativePath/>
       </parent>
   
       <dependencies>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-eureka</artifactId>
               <version>RELEASE</version>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-ribbon</artifactId>
               <version>RELEASE</version>
           </dependency>
       </dependencies>
   
       <dependencyManagement>
           <dependencies>
               <dependency>
                   <groupId>org.springframework.cloud</groupId>
                   <artifactId>spring-cloud-dependencies</artifactId>
                   <version>Camden.SR3</version>
                   <type>pom</type>
                   <scope>import</scope>
               </dependency>
           </dependencies>
       </dependencyManagement>
   </project>
   

    

3. 编写启动类

   package com.yyl.customer;
   
   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.web.client.RestTemplate;
   
   /**
    * @author yangyuanliang
    */
   @EnableDiscoveryClient
   @SpringBootApplication
   public class EurekaServerCustomerApplication {
       @Bean
       @LoadBalanced
       RestTemplate restTemplate(){
           return new RestTemplate();
       }
       public static void main(String[] args) {
           SpringApplication.run(EurekaServerCustomerApplication.class, args);
       }
   
   }
   

    

4. 测试controller

   package com.yyl.customer.controller;
   
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RequestMethod;
   import org.springframework.web.bind.annotation.RestController;
   import org.springframework.web.client.RestTemplate;
   
   /**
    * author:yangyuanliang Date:2019-08-14 Time:17:39
    **/
   @RestController
   public class CustomerController {
       @Autowired
       private RestTemplate restTemplate;
   
       @RequestMapping(value = "/customer",method = RequestMethod.GET)
       public String helloCustomer(){
           return restTemplate.getForEntity("http://hello-service/hello",String.class).getBody();
       }
   }
   

    

5. 编写application.properties

   server.port=8888
   spring.application.name=customer
   eureka.client.service-url.defaultZone=http://localhost:8672/eureka/,http://localhost:8673/eureka/
   

    

6. 改造https://mp.csdn.net/postedit/99455466 服务提供者代码或者下载

   git clone https://github.com/Jacwo/eureka-server-provider.git

7. 多节点启动生产者即服务提供者

   mvn package
   //节点1
   java -jar target/eureka-server-provider-0.0.1-SNAPSHOT.jar
   //节点2
   java -jar target/eureka-server-provider-0.0.1-SNAPSHOT.jar --spring.profiles.active=p1
   

    

8. 启动消费者 mvn spring-boot:run 
9. 开始测试 http://localhost:8888/customer 多次刷新查看生产者日志