Eureka手把手集群配置

一、创建eurekaServer

1、创建第一个server，创建一个springboot工程

1）java代码如下，使用端口7070：

@EnableEurekaServer
@SpringBootApplication
@RestController
public class EurekaserverApplication {
	@RequestMapping("/exec")  
	public String execInfo() {
		System.out.println("server01"); //danielinbiti
		return "server01";
	}
    public static void main(String[] args) {
        SpringApplication.run(EurekaserverApplication.class, args);
    }
}

2）application.properties配置如下

server.port=7070
spring.application.name=server-01
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=false
eureka.client.serviceUrl.defaultZone=http://localhost:7070/eureka/,http://localhost:7020/eureka/
eureka.instance.metadataMap.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}

2、创建第二个server，创建一个springboot工程

1）java代码如下，使用端口7020

@EnableEurekaServer
@SpringBootApplication
@RestController
public class EurekaserverApplication {
	@RequestMapping("/exec")  
	public String execInfo() {
		System.out.println("server02");
		return "server02";
	}
    public static void main(String[] args) {
        SpringApplication.run(EurekaserverApplication.class, args);
    }
}

2）application.properties

server.port=7020
spring.application.name=server-01
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=false
eureka.client.serviceUrl.defaultZone=http://localhost:7070/eureka/,http://localhost:7020/eureka/
eureka.instance.metadataMap.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}

二、创建eurekaClient工程

1、java代码

@SpringBootApplication
@EnableEurekaClient
@RestController
@EnableAutoConfiguration
public class EurekaClientApplication {
	@Autowired  
    private DiscoveryClient discoveryClient; 
	@RequestMapping("/getInfo")  
	public String getInfo() {
		return "ekClient2";
	}
	@Bean
	@LoadBalanced
	public RestTemplate restTemplate(RestTemplateBuilder builder) {
	   return builder.build();
	}
	@Autowired
    private RestTemplate restTemplate;
	
	@RequestMapping("/exec")  
	public String execInfo() {
		return restTemplate.getForObject("http://server-01/exec/", String.class);
	}
	@RequestMapping("/registered")  
    public String getRegistered(){  
        List list = discoveryClient.getInstances("STORES");  
        System.out.println(discoveryClient.getLocalServiceInstance());  
        System.out.println("discoveryClient.getServices().size() = " + discoveryClient.getServices().size());  
          //comment by danielinbiti
        for( String s :  discoveryClient.getServices()){  
            System.out.println("services " + s);  
            List serviceInstances =  discoveryClient.getInstances(s);  
            for(ServiceInstance si : serviceInstances){  
                System.out.println("    services:" + s + ":getHost()=" + si.getHost());  
                System.out.println("    services:" + s + ":getPort()=" + si.getPort());  
                System.out.println("    services:" + s + ":getServiceId()=" + si.getServiceId());  
                System.out.println("    services:" + s + ":getUri()=" + si.getUri());  
                System.out.println("    services:" + s + ":getMetadata()=" + si.getMetadata());  
            }  
              
        }  
        System.out.println(list.size());  
        if (list != null && list.size() > 0 ) {  
            System.out.println( list.get(0).getUri()  );  
        }  
        return "success";  
    }  
    public static void main(String[] args) {
        SpringApplication.run(EurekaClientApplication.class, args);
    }
}

2、application.properties配置文件

server.port=6060
spring.application.name=client-02
eureka.client.serviceUrl.defaultZone=http://localhost:7070/eureka/
eureka.instance.metadataMap.instanceId=${PRO_TEST:5555}

三、启动上面服务后，再IE地址栏中访问

http://localhost:6060/exec   就会来回出现server01,server02

四、注意点：

RestTemplate创建是需要加上负载策略，@LoadBalanced