Dubbo zookeeper 初探

先把zookeeper在本地给安装好，

安装方法参考：http://blog.csdn.net/wxwzy738/article/details/16330253

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

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

b、dubbo-demo-provider 服务提供者

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

<?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

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

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

<?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