Dubbo Zookeeper 初探

zookeeper使用和原理探究    可以参考这篇文章：

http://jm-blog.aliapp.com/?p=665

 

这里的话讲述了两个工程一个工程是提供服务的，一个工程是调用服务的，因为dubbo是跟spring进行无缝连接的，故功能配置在spring的配置文件中，跟spring进行整合开发

1. 工程是以maven进行构建的，使用的jar包如下：

2. 服务提供者的工程

a. dubbo-demo-api 定义接口

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public interface IProcessData {     public String deal(String data); }

b. dubbo-demo-provider 服务提供者

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public class ProcessDataImpl implements IProcessData {     /*      * @see com.xxx.bubbo.provider.IProcessData#deal(java.lang.String)      */     @Override     public String deal(String data) {         try {             Thread.sleep(1000);         } catch (InterruptedException e) {             e.printStackTrace();         }         return "Finished:" + data;     } }

c. applicationProvider.xml配置

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<?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          ">          <!-- Application name -->      <dubbo:application name="hello-world-app" />          <!-- registry address, used for service to register itself -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />          <!-- expose this service through dubbo protocol, through port 20880 -->      <!--      <dubbo:protocol name="dubbo" port="20880" />              <dubbo:protocol name="dubbo" port="9090" server="netty"          client="netty" codec="dubbo" serialization="hessian2" charset="UTF-8"          threadpool="fixed" threads="100" queues="0" iothreads="9" buffer="8192"          accepts="1000" payload="8388608" />          -->      <!-- Service interface   Concurrent Control  -->      <dubbo:service interface="com.huangjie.dubbo_Service.service.IProcessData"          ref="demoService" executes="10" />          <!-- Default Protocol -->      <!--      <dubbo:protocol server="netty" />      -->          <!-- designate implementation -->      <bean id="demoService" class="com.huangjie.dubbo_Service.service.impl.ProcessDataImpl" />      </beans>

d. 启动服务

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public class DubboProviderMain {      public static void main(String[] args) throws Exception {          ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                  new String[]{"applicationProvider.xml"});          context.start();             System.out.println("Press any key to exit.");          System.in.read();      }  }

3. 服务调用者的工程

a. 调用类

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public class ConsumerThd implements Runnable {          /*       * @see java.lang.Runnable#run()      */      @Override      public void run() {         ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                  new String[]{"applicationConsumer.xml"});          context.start();              IProcessData demoService = (IProcessData) context.getBean("demoService"); // get                                                                                  // service                                                                                  // invocation          // proxy          String hello = demoService.deal("nihao"); // do invoke!              System.out.println(Thread.currentThread().getName() + " "+hello);      }            public static void main(String[] args) {         new Thread(new ConsumerThd()).start();         /**          * 输出结果：          * Thread-0 Finished:nihao          */     } }

b. applicationConsumer.xml配置

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<?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          ">          <!-- consumer application name -->      <dubbo:application name="consumer-of-helloworld-app" />          <!-- registry address, used for consumer to discover services -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />      <dubbo:consumer timeout="5000"/>      <!-- which service to consume? -->      <dubbo:reference id="demoService" interface="com.huangjie.dubbo_Service.service.IProcessData" />  </beans>

4. 最后需要把zookeeper的服务给启动，在zookeeper安装文件夹下面的bin目录里面的zkServer.cmd给点击运行。不要关闭窗口，保持服务运行

这样整个调用就完成了，这样的好处是只要远程提供ip地址及端口号，以及对外调用的类，客户端就可以调用，客户端不必知道服务端的地址之类的。

而且服务端可以开多个zookeeper服务，这样如果其中一个zookeeper 服务死掉了，其他服务还能正常运行。