这一章节主要讲如何搭建eureka-client项目.

在我们生成的Demo项目上右键点击New->Module->spring Initializr, 然后next, 填写Group和Artifact等信息，

这里Artifact填写eurekaclient, 再次next,

这里选择的Web下的web和Cloud Discovery下的Eureka Discovery.

最后在Module Name中填写eureka-client.

生成的pom.xml文件如下:

     
         
      
       4.0.0
          
              
       
        org.springframework.boot
               
       
        spring-boot-starter-parent
               
       
        2.1.3.RELEASE
               
        
           
          
      
       com.xum
          
      
       eureka-client
          
      
       0.0.1-SNAPSHOT
          
      
       eureka-client
          
      
       Demo project for Spring Boot
          
              
       
        UTF-8
               
       
        UTF-8
               
       
        1.8
               
       
        Greenwich.RELEASE
           
          
              
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-web
                
               
                   
        
         org.springframework.cloud
                    
        
         spring-cloud-starter-netflix-eureka-client
                
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-starter-test
                    
        
         test
                
           
          
              
                   
                        
         
          org.springframework.cloud
                         
         
          spring-cloud-dependencies
                         
         
          ${spring-cloud.version}
                         
         
          pom
                         
         
          import
                     
                
           
          
              
                   
                        
         
          org.springframework.boot
                         
         
          spring-boot-maven-plugin
                     
                
           
          
              
                   
        
         spring-milestones
                    
        
         Spring Milestones
                    
        
         https://repo.spring.io/milestone
                
           
      
     

然后在EurekaClientApplication上加@EnableEurekaClient注解:

package com.xum.eurekaclient;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient@SpringBootApplicationpublic class EurekaClientApplication {    public static void main(String[] args) {        SpringApplication.run(EurekaClientApplication.class, args);    }}

然后新建application.yml文件, 内容如下:

eureka:  client:    serviceUrl:      defaultZone: http://localhost:8761/eureka/    这里的defaultZone是上一章节的对应eureka-serverserver:  port: 8762spring:  application:    name: eureka-client

然后写一个controller去获取数据, 这里是获取git上的数据, 关于config-server的项目下一章节说

package com.xum.eurekaclient.controller;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.client.ServiceInstance;import org.springframework.cloud.client.discovery.DiscoveryClient;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import java.lang.reflect.Method;import java.util.List;@RestController@RequestMapping(value = "/testone")public class TestOneController {    private static final Logger LOG = LoggerFactory.getLogger(TestOneController.class);    @Autowired    private DiscoveryClient discoveryClient;    @Value("${server.port}")    String port;    /* from git config */    @Value("${democonfigclient.message}")    String message;    /* from git config */    @Value("${foo}")    String foo;    @RequestMapping(value = "/test")    public String test(@RequestParam(value = "name", required = false, defaultValue = "testOneClient")String name) {        /*List
     
       list = discoveryClient.getInstances("eureka-client");        LOG.info("discoveryClient.getServices().size() = " + discoveryClient.getServices().size());        for( String s :  discoveryClient.getServices()){            List
      
        serviceInstances =  discoveryClient.getInstances(s);            for(ServiceInstance si : serviceInstances){                LOG.info("services:" + s + ":getHost()=" + si.getHost());                LOG.info("services:" + s + ":getPort()=" + si.getPort());                LOG.info("services:" + s + ":getServiceId()=" + si.getServiceId());                LOG.info("services:" + s + ":getUri()=" + si.getUri());            }        }*/        String info = "Hi " + name + ", this is EurekaClient, port is " + port;        return info;    }    @RequestMapping(value = "/config", method = RequestMethod.GET)    public String config() {        String info = "port:" + port + ",message:" + message + ",foo:" + foo;        return info;    }}
      
     

最后通过Run DashBoard运行项目,

首先运行上一章节的eureka-server项目, 然后运行eureka-client的项目.

在浏览器上输入http://localhost:8761,显示如下: (我这里同时运行了config-server项目, 这个项目下一章节讲)

先在浏览器中输入http://localhost:8762/testone/test, 显示如下

port是eureka-client的端口

然后在浏览器中输入http://localhost:8762/testone/config, 显示如下

port是eureka-client的端口, message和foo是从git仓库中获取的, 是通过config-server项目获取的.

下一章节讲config-server项目的搭建.