创建服务提供者

概述

当Eureka Client向Eureka Server注册时,它会提供一些元数据,例如主机和端口,URL,主页等。Eureka Server从每个Client实例接受心跳信息。如果心跳超时,则通常将该实例从注册Server剔除。

POM

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

Application

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
​
@SpringBootApplication
@EnableDiscoveryClient
public class EurekaProviderApplication {
​
    public static void main(String[] args) {
        SpringApplication.run(EurekaProviderApplication.class, args);
    }
}

Application.yml

server:
  port: 8089
​
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:1111/eureka/
  instance:
    lease-renewal-interval-in-seconds: 10 #服务续约(默认30s)
    lease-expiration-duration-in-seconds: 15 #服务剔除>服务续约时间(默认90s)
    hostname: localhost
    instance-id: ${spring.application.name}:${server.port}
​
spring:
  application:
    name: eureka-provider
management:
  security:
    enabled: false #spring boot actuator#端点监控安全是否启用属性

注意： 需要指明 spring.application.name,这个很重要,这在以后的服务与服务之间相互调用一般都是根据这个 name 。从时间上来算,Eureka注册中心剔除一个失效服务需要3分钟,

客户端服务续约时间(30s)+客户端服务剔除时间(90s)+剔除失效服务时间(60s)=180秒

Controller

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;;
import org.springframework.cloud.client.serviceregistry.Registration;
import org.springframework.cloud.client.serviceregistry.ServiceRegistry;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
​
import javax.annotation.Resource;
​
@RestController
@Slf4j
public class HelloController {
​
    public static final String HELLO_WORLD = "Hello World!";
    
    //spring cloud 1.2.0
    @Resource
    private Registration registration;
​
    @Autowired
    private ServiceRegistry serviceRegistry;
​
    /**
     * test eureka-client-ribbon model ribbon retry
     * <br/>
     **/
    @GetMapping("/hello")
    public String index() {
        log.info("load balanced service instance meta: {}", registration.getMetadata());
        log.info("load balanced host: {},port: {},service id: {}", registration.getHost(), registration.getPort(), registration.getServiceId());
        log.info("service id: {}", registration.getServiceId());
        log.info("service registry: {}", serviceRegistry.getStatus(registration));
        return HELLO_WORLD;
    }
​
}

启动工程,打开http://localhost:1111/,即为Eureka Server的网址