概述
当 Client 向 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 实例接收心跳消息。如果心跳超时，则通常将该实例从注册 Server 中删除。
POM
<?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> <parent> <groupId>com.ycq</groupId> <artifactId>hello-spring-cloud-dependencies</artifactId> <version>1.0.0-SNAPSHOT</version> <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath> </parent> <artifactId>hello-spring-cloud-service-admin</artifactId> <packaging>jar</packaging> <name>hello-spring-cloud-service-admin</name> <dependencies> <!-- Spring Boot Begin --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- Spring Boot End --> <!-- Spring Cloud Begin --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <!-- Spring Cloud End --> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>com.ycq.hello.spring.cloud.service.admin.ServiceAdminApplication</mainClass> </configuration> </plugin> </plugins> </build> </project>
Application
通过主机 @EnableEurekaClient 表明自己是一个 Eureka Client。
package com.ycq.hello.spring.cloud.service.admin; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class ServiceAdminApplication { public static void main(String[] args) { SpringApplication.run(ServiceAdminApplication.class, args); } }
application.yml
spring: application: name: hello-spring-cloud-service-admin server: port: 8762 eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/
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项目调用一般都是根据这个 name
Controller
package com.ycq.hello.spring.cloud.service.admin.controller; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; @RestController public class AdminController { @Value("${server.port}") private String port; @RequestMapping(value = "hi", method = RequestMethod.GET) public String sayHi(String message){ return String.format("You message is %s，You port is %s", message, port); } }
启动工程，打开 http://localhost:8761 ，即 Eureka Server 的网址：
你会发现一个服务已经注册在服务中了，服务名为 HELLO-SPRING-CLOUD-SERVICE-ADMIN， 端口为 8762
这是打开 http://localhost:8762/hi?message=HelloSpring ，你会在浏览器上看到：
You message is HelloSpring，You port is 8762
