一、准备工作，eclipse运行两个实例

1、修改  eurekaclient1 中 application.yml 文件

server:  port: 8762spring:  application:    name: eurekaclienteureka:  instance:     instance-id: eurekaclient1     appname: ${spring.application.name}  client:    serviceUrl:      defaultZone: http://localhost:8761/eureka/

2、同级目录下复制一份 application.yml 文件 命名为  application-two.yml

server:  port: 8763spring:  application:    name: eurekaclienteureka:  instance:     instance-id: eurekaclient2     appname: ${spring.application.name}  client:    serviceUrl:      defaultZone: http://localhost:8761/eureka/

3、启动  EurekaClientApplication.java （第一个实例）

4、启动 EurekaClientApplication.java  （第二个实例）

右键->Run As  -> Run Configurations.. ->Arguments-> Programe Arguments 输入 --spring.profiles.active=two   点击 run

5、查看 多个实例

6、1

二、新建maven 工程 service-ribbon （服务消费者 ）

1、修改pom.xml

      
     
      4.0.0
       
     
      wg
       
     
      service-ribbon
       
     
      0.0.1-SNAPSHOT
       
     
      jar
       
     
      service-ribbon
       
     
      http://maven.apache.org
       
         
      
       UTF-8
          
      
       UTF-8
          
      
       Greenwich.RELEASE
          
      
       1.8
        
       
         
      
       org.springframework.boot
          
      
       spring-boot-starter-parent
          
      
       2.1.1.RELEASE
          
       
        
       
     	
              
       
        org.springframework.cloud
               
       
        spring-cloud-starter-netflix-eureka-client
           
          
              
       
        org.springframework.boot
               
       
        spring-boot-starter-web
           
          
              
       
        org.springframework.cloud
               
       
        spring-cloud-starter-netflix-ribbon
           
          
            
       
        junit
             
       
        junit
             
       
        test
           
        
       
         
            
               
        
         org.springframework.cloud
                
        
         spring-cloud-dependencies
                
        
         ${spring-cloud.version}
                
        
         pom
                
        
         import
              
           
        
     
    

2、创建启动类（位于所有类的上级包下）

package wg;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.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.context.annotation.Bean;import org.springframework.web.client.RestTemplate;@SpringBootApplication@EnableEurekaClient@EnableDiscoveryClientpublic class ServiceRibbonApplication {	public static void main(String[] args) {        SpringApplication.run( ServiceRibbonApplication.class, args );    }    @Bean    @LoadBalanced    RestTemplate restTemplate() {        return new RestTemplate();    }}

3、创建application.yml

server:  port: 8764spring:  application:    name: service-ribboneureka:  client:    serviceUrl:      defaultZone: http://localhost:8761/eureka/

4、创建service 

package wg.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.web.client.RestTemplate;@Servicepublic class HelloService {	@Autowired    RestTemplate restTemplate;    public String helloService() {        return restTemplate.getForObject("http://EUREKACLIENT/",String.class);    }}

5、创建controller

package wg.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import wg.service.HelloService;@RestControllerpublic class HelloController {	@Autowired    HelloService helloService;    @RequestMapping(value = "/hello")    public String hi() {        return helloService.helloService( );    }}

6、启动项目，多次访问：

交替出现

7、访问 

项目结构：

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