使用maven多模块构建dubbo第一个分布式HelloWorld
IDE :IntelliJ IDEA 2016.1(原理都一样)创建一个maven项目作为root模块 命名为mydubbo,并删除其中的src目录(不需要)除外我们需要Spring,zookeeper的依赖mydubbo->pom.xml<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:x
至于为什么要用maven多模块构建项目,和dubbo是做什么的就不多说了,直接开始。
首先创建一个maven项目作为root模块 命名为mydubbo,并删除其中的src目录(不需要)
除外我们需要Spring,zookeeper的依赖
mydubbo->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</groupId>
<artifactId>mydubbo</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<properties>
<spring.version>3.2.4.RELEASE</spring.version>
</properties>
<modules>
<module>myProvider</module>
<module>myConsumer</module>
<module>myService</module>
</modules>
<dependencies>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--dubbo注册中心-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency>
<!--zookeeper客户端-->
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
</project>
然后创建三个maven子模块分别为myService、myProvider、myConsumer
myService:功能接口模块
myProvider:dubbo提供者
myConsumer:dubbo消费者
因为消费者和提供者的功能接口一致,所以都依赖myService模块(myService的项目packing 为 jar)
myProvider->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">
<parent>
<artifactId>mydubbo</artifactId>
<groupId>com</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>myProvider</artifactId>
<dependencies>
<dependency>
<groupId>com</groupId>
<artifactId>myService</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
myConsumer->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">
<parent>
<artifactId>mydubbo</artifactId>
<groupId>com</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>myConsumer</artifactId>
<dependencies>
<dependency>
<groupId>com</groupId>
<artifactId>myService</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
myService->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">
<parent>
<artifactId>mydubbo</artifactId>
<groupId>com</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<name>myService</name>
<artifactId>myService</artifactId>
<packaging>jar</packaging>
</project>
在myService中建立一个Interface,命名为HelloService,具体如下
HelloService.java
package com.service;
/**
* Created by yuyufeng on 2016/11/16.
*/
public interface HelloService {
String speakHello(String name);
}
现在,我们需要install myService这个项目,产生一个可以依赖的jar供其它引用者使用。
myProvider的依赖就有myService产生的jar
现在,开始编写dubbo提供者myProvider的代码
首先,需要提供HelloService的实现
HelloServiceImpl.java
package com.service.impl;
import com.service.HelloService;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class HelloServiceImpl implements HelloService {
public String speakHello(String name) {
return "你好:" + name;
}
}
然后使
用Spring配置声明暴露服务,建立一个provider.xml 如下
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 提供方应用信息,用于计算依赖关系 -->
<dubbo:application name="hello-provider" />
<!-- 使用multicast广播注册中心暴露服务地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- 声明需要暴露的服务接口 -->
<dubbo:service interface="com.service.HelloService" ref="helloService" />
<!-- 和本地bean一样实现服务 -->
<bean id="helloService" class="com.service.impl.HelloServiceImpl" />
</beans>
本次dubbo使用的注册中心为zookeeper,所以需要在本地启动一个zookeeper服务。
最后,我们就可以启动提供者服务了,启动类如下:
package com.service.impl;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class ProviderServer{
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
context.start();
//按任意键退出
System.in.read();
}
}
启动之后我们可以在zookeeper注册中心看到我们的服务提供者已经注册在上面
然后,就编写个消费者通过dubbo来调以下远程的服务吧
消费者通过Spring配置引用远程服务spring配置文件如下:
consumer.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 消费方应用名,用于计算依赖关系,不是匹配条件,不要与提供方一样 -->
<dubbo:application name="hello-consumer" />
<!-- 使用multicast广播注册中心暴露发现服务地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 生成远程服务代理,可以和本地bean一样使用demoService -->
<dubbo:reference id="helloService" interface="com.service.HelloService" />
</beans>
消费者启动类
ConsumerClient.java
import com.service.HelloService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class ConsumerClient {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("consumer.xml");
HelloService helloService = (HelloService) context.getBean("helloService");
String result = helloService.speakHello("yyf");
System.out.println(result);
}
}
运行改类,结果如下:
可以看到,远程服务调用成功。
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