使用dubbo+zookeeper创建一个小应用

    dubbo和zookeeper都是分布式服务框架，其中dubbo是阿里巴巴研发的开源框架，dubbo主要分为服务提供方，服务消费方，注册中心，监控中心，服务运行容器。下图是dubbo官网的一个结构图：

这里zookeeper在这里主要是用来作为dubbo的注册中心，dubbo还可以使用Multicast注册中心，Zookeeper注册中心，Redis注册中心，Simple注册中心。下面来看实例：

创建一个Java Project作为dubbo的 provider。命名为DubboProvider

1、引入一下jar包：

2、新建一个IhelloService接口

package com.service;/** * @description * @date：(2016-3-29 下午10:21:03) * @author Administrator * @version v1.0 * @since v1.0 * * Modified history * *    Modified date:   *    Modifier user:      *    description:  * * */public interface IHelloService {String sayHello(String name);}

3、新建一个IhelloService的实现类HelloServiceImpl.java

package com.service.impl;import com.service.IHelloService;/** * @description * @date：(2016-3-29 下午10:21:26) * @author Administrator * @version v1.0 * @since v1.0 * * Modified history * *    Modified date:   *    Modifier user:      *    description:  * * */public class HelloServiceImpl implements IHelloService{@Overridepublic String sayHello(String name) {System.out.println("生产者中的方法执行...");return "hello "+name;}}

3、新建一个provider.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:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsdhttp://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"default-lazy-init="false" >   <dubbo:application name="hello-world-app"  />     <!-- 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.IHelloService" ref="helloService" />     <!-- 和本地bean一样实现服务 -->    <bean id="helloService" class="com.service.impl.HelloServiceImpl" /></beans>

4、新建一个服务发布者启动类

package com.test;import java.io.IOException;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * @description * @date：(2016-3-29 下午10:41:24) * @author Administrator * @version v1.0 * @since v1.0 * * Modified history * *    Modified date:   *    Modifier user:      *    description:  * * */public class TestProvider {public static void main(String[] args) throws IOException {ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("provider.xml");applicationContext.start(); System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟 }}

然后在新建一个Java Project项目DubboConsumer,并引入一下jar包：

5、在DubboConsumer中新建一个接口IhelloService.java

package com.service;/** * @description * @date：(2016-3-29 下午10:21:03) * @author Administrator * @version v1.0 * @since v1.0 * * Modified history * *    Modified date:   *    Modifier user:      *    description:  * * */public interface IHelloService {String sayHello(String name);}

6、新建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:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsdhttp://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"default-lazy-init="false" >       <!-- 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="consumer-of-helloworld-app"  />     <!-- 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"/>        <!-- 用dubbo协议在20880端口暴露服务 -->    <!-- <dubbo:protocol name="dubbo" port="20880" /> -->         <!-- 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.IHelloService" /></beans>

7、新建一个测试类TestConsumer

package com.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.service.IHelloService;/** * @description * @date：(2016-3-29 下午10:41:03) * @author Administrator * @version v1.0 * @since v1.0 * * Modified history * *    Modified date:   *    Modifier user:      *    description:  * * */public class TestConsumer {public static void main(String[] args) {ApplicationContext applicationContext=new ClassPathXmlApplicationContext("consumer.xml");IHelloService helloService=(IHelloService)applicationContext.getBean("helloService");String result=helloService.sayHello("Tom"); System.out.println(result);}}

8、下载zookeeper

http://www.apache.org/dist/zookeeper/

9、先启动zookeeper注册中心

/zookeeper-3.4.8\bin目录下的zkServer.cmd(window环境)或者zkServer.sh（Linux环境）。然后在运行TestProvider.java在运行TestConsumer就能看到输出结果。