[Spring cloud 一步步实现广告系统] 2. 配置&Eureka服务

父项目管理

首先，我们在创建投放系统之前，先看一下我们的工程结构：

mscx-ad-sponsor就是我们的广告投放系统。如上结构，我们需要首先创建一个Parent Project mscx-ad

来编写父项目的pom，来管理我们的统一依赖信息。

<?  version="1.0" encoding="UTF-8"?><project  ns="http://maven.apache.org/POM/4.0.0"          ns:xsi="http://www.w3.org/2001/ Schema-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>    <packaging>pom</packaging>    <modules>        <module>mscx-ad-discovery</module>        <module>mscx-ad-zuul</module>        <module>mscx-ad-gateway</module>        <module>mscx-ad-discovery-nacos</module>        <module>mscx-ad-common</module>        <module>mscx-ad-db</module>        <module>mscx-ad-sponsor</module>        <module>mscx-ad-search</module>        <module>mscx-ad-feign-sdk</module>    </modules>    <parent>        <groupId>org.spring work.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.5.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.sxzhongf</groupId>    <artifactId>mscx-ad</artifactId>    <version>1.0-SNAPSHOT</version>    <name>分布式广告系统</name>    <de ion>基于Spring Cloud Alibaba 实现的分布式广告系统</de ion>    <properties>        <java.version>1.8</java.version>        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>    </properties>    <dependencies>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>        </dependency>        <dependency>            <groupId>org.spring work.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>       <!--Spring cloud 监控端点管理依赖-->        <dependency>            <groupId>org.spring work.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>    </dependencies>        <!--定义Spring Cloud 主版本-->    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.spring work.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>${spring-cloud.version}</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement>    <!--定义远程maven仓库-->    <repositories>          <!-- Spring 中央仓库 -->        <repository>            <id>spring-milestones</id>            <name>Spring Milestones</name>            <url>https://repo.spring.io/milestone</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>        <!-- Ali 中央仓库 -->        <repository>            <id>alibaba-milestones</id>            <name>ali Milestones</name>            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories>        <!--项目编译插件-->    <build>        <plugins>            <plugin>                <groupId>org.spring work.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

服务发现

Eureka

• Eureka Server (提供服务的注册和发现)

• Eureka Client

  • Service provider (服务提供方，将自身注册到server上，从而让Eureka Server保存provider的元数据，让其他的服务消费者可以找到当前服务)
  • Service Consumer(服务消费方，从Eureka Server上获取注册的服务列表，从而消费服务)

创建project mscx-ad-discovery, 然后使用SpringBoot项目的三部曲（加依赖，加注解，改配置）

编写POM，重点关注依赖spring-cloud-starter-eureka-server

<?  version="1.0" encoding="UTF-8"?><project  ns="http://maven.apache.org/POM/4.0.0"          ns:xsi="http://www.w3.org/2001/ Schema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>mscx-ad</artifactId>        <groupId>com.sxzhongf</groupId>        <version>1.0-SNAPSHOT</version>        <relativePath>../pom. </relativePath>    </parent>    <modelVersion>4.0.0</modelVersion>    <packaging>jar</packaging>    <groupId>com.sxzhongf</groupId>    <artifactId>mscx-ad-discovery</artifactId>    <version>1.0-SNAPSHOT</version>    <name>服务发现组件</name>    <de ion>先使用eureka实现，后续会使用nacos替换掉</de ion>    <dependencies>        <dependency>            <groupId>org.spring work.cloud</groupId>            <!--<artifactId>spring-cloud-netflix-eureka-server</artifactId>-->            <artifactId>spring-cloud-starter-eureka-server</artifactId>            <version>1.2.7.RELEASE</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.spring work.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

添加注解(@EnableEurekaServer)

@SpringBootApplication@EnableEurekaServerpublic class DiscoveryApplication {    public static void main(String[] args) {        SpringApplication.run(DiscoveryApplication.class, args);    }}

改配置

单点

spring:  application:    name: ad-discovery-serverserver:  port: 8888eureka:  instance:    hostname: localhost #单机版  client:    fetch-registry: false #是否从eureka server获取注册信息    register-with-eureka: false #注册自己到eureka    service-url:      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

集群

测试的时候，需要修改hosts文件

zhangpandeMacBook-Pro:etc zhangpan$ cat hosts##...##127.0.0.1    localhost127.0.0.1    server1127.0.0.1    server2127.0.0.1    server3::1             localhost

然后修改application.yml

spring:  application:    name: ad-discovery  profiles: server1server:  port: 7777eureka:  instance:    hostname: server1    prefer-ip-address: false  client:    service-url:      defaultZone: http://server2:8888/eureka/,http://server3:9999/eureka/---spring:  application:    name: ad-discovery  profiles: server2server:  port: 8888eureka:  instance:    hostname: server2    prefer-ip-address: false  client:    service-url:      defaultZone: http://server1:7777/eureka/,http://server3:9999/eureka/---spring:  application:    name: ad-discovery  profiles: server3server:  port: 9999eureka:  instance:    hostname: server3    prefer-ip-address: false  client:    service-url:      defaultZone: http://server2:8888/eureka/,http://server1:7777/eureka/

启动集群测试：

• 配置启动profile / java -jar mscx-ad-discovery.jar --spring.profiles.active=server1
  
• 效果展示