在上一篇中我创建了一个注册中心,现在我就可以给他注册服务。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。
1.创建服务
创建服务的过程和创建注册中心的步骤一样,可以参考SpringCloud 第一篇: 服务注册中心(Eureka)。
创建完pom.xml如下:
<?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><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>demo</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build><repositories><repository><id>spring-snapshots</id><name>Spring Snapshots</name><url>https://repo.spring.io/snapshot</url><snapshots><enabled>true</enabled></snapshots></repository><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories></project>
2.添加服务注解
通过注解@EnableEurekaClient 表明自己是一个eurekaclient。
package com.example.client;import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@SpringBootApplication
@EnableEurekaClient
@RestController
public class DemoClientApplication {public static void main(String[] args) {SpringApplication.run(DemoClientApplication.class, args);}@Value("${server.port}")String port;@RequestMapping("/hello")public String home(@RequestParam String name) {return "hello 来自 port:" +port +"的," + name;}
}
3.配置文件
在配置文件中配置服务注册中心的地址,applicaton.yml配置如下:
eureka:client:serviceUrl:#注册中心地址defaultZone: http://localhost:10000/eureka/
server:port: 10001
spring:application:#服务名用于将来服务之间的调用(注意:服务名中含有下划线将无法使用Feign进行跨服务调用)name: service-demo
4.发现服务
启动工程,打开http://localhost:10000/,即eureka server 的网址,可以看到已经注册了一个服务,服务名为:service-demo。
5.调用服务
这时打开 http://localhost:10001/hello?name=yanling ,你会在浏览器上看到 :