【SpringCloud】（四）：创建Eureka Server实例

  本篇文章我们来实现一个Eureka Server实例，在实现之前，首先将代码重构。将项目结构修改为maven的聚合工程。

一.修改项目结构

服务提供者：microservice-provider-user和服务消费者：microservice-comsumer-movie。

这两个工程，在第一篇博客的技术上主要修改了 POM.xml中的依赖。

1.修改parent依赖，为创建的parent的工程

2.项目依赖的版本继承parent

3.删除自身依赖的<groupId>和<version>，继承自parent.

4.删除了单元测试的依赖和单元测试的类文件。

服务提供者 microservice-discovery-eureka 的POM.xml

<?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><artifactId>microservice-provider-user</artifactId><packaging>jar</packaging><parent><groupId>com.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</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></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.h2database</groupId><artifactId>h2</artifactId><scope>runtime</scope></dependency></dependencies></project>

服务消费者 microservice-comsumer-movie的POM.xml

<?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><artifactId>microservice-comsumer-movie</artifactId><packaging>jar</packaging><parent><groupId>com.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</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></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies></project>

创建parent工程：microservice-parent

主要是聚合子工程和统一依赖的版本。

POM.XML

<?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.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><modules><module>microservice-provider-user</module><module>microservice-comsumer-movie</module><module>microservice-discovery-eureka</module></modules><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><!-- 依赖版本的继承，2中方式 --><!--  方案:1： 父类中，每个依赖都加入相应的版本。<dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId><version>1.4.1.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.h2database</groupId><artifactId>h2</artifactId><scope>runtime</scope></dependency></dependencies></dependencyManagement> --><!-- 方式2：加入SpringCloud的依赖 --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.1.RELEASE</version></parent><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Camden.SR1</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></project>

第二种方案：解决子工程依赖的版本问题：http://projects.spring.io/spring-cloud/

二.创建Eureka Server

创建Eureka工程： microservice-discovery-eureka

该工程创建Eureka Server实例。

POM.xml

<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>  <artifactId>microservice-discovery-eureka</artifactId>  <packaging>jar</packaging><parent><groupId>com.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</version><relativePath/> </parent>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties><dependencies>    <dependency>        <groupId>org.springframework.cloud</groupId>        <artifactId>spring-cloud-starter-eureka-server</artifactId>    </dependency></dependencies></project>

加入的依赖为：spring-cloud-starter-eureka-server

启动类 EurekaApplication

package com.dynamic.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication@EnableEurekaServer//声明一个server：@EnableEurekaServerpublic class EurekaApplication {    public static void main( String[] args )    {    SpringApplication.run(EurekaApplication.class, args);        }}

配置文件：application.yml

server:  port: 8761 #Eurake默认端口eureka:  client:    register-with-eureka: false    fetch-registry: false    service-url:      defaultZone: http://localhost:8761/eureka #把Eureka注册到那个Eureka上面

启动Eureka成功