阿里巴巴 Dubbo框架demo

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dubbo
zookeeper

Dubbo zookeeper

三个module:

service:定义接口

provider：定义接口实现

consumer：模拟接口调用

1：service

只是象征性的定义了一个接口：

package com.tch.test.dubbo.service;

public interface DemoService {

    String sayHello(String name);

}

2：provider：

pom.xml:

		<dependency>
			<groupId>com.tch.test.dubbo</groupId>
			<artifactId>service</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.8.4</version>
		</dependency>
		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.7</version>
		</dependency>

还有一个接口的简单实现：

package com.tch.test.dubbo.provider.serviceimpl;

import com.tch.test.dubbo.service.DemoService;

public class DemoServiceImpl implements DemoService {

    public String sayHello(String name) {

        return "Hello " + name;

    }

}

然后是spring配置文件applicationContext.xml，里面保护了dubbo的配置，我这里使用到了本地localhost的zookeeper，端口是默认的2181，如果不用zookeeper的话，直接将

<dubbo:registry address="zookeeper://localhost:2181" check="false"></dubbo:registry>

这句话注释掉，将

<dubbo:registry address="multicast://224.5.6.7:1234" />

放开即可。至于为什么建议zookeeper部署奇数台，是因为根据zookeeper的leader选举算法，由于zookeeper挂掉一半的机器集群就不可用，所以部署4台和3台的集群都是在挂掉2台后集群不可用，所以使用奇数台机器，不浪费资源

：

<?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-world-app" />
	<!-- 使用multicast广播注册中心暴露服务地址 -->
	<!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->
	<dubbo:registry address="zookeeper://localhost:2181" check="false"></dubbo:registry>
	<!-- 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.tch.test.dubbo.service.DemoService"
		ref="demoService" />
	<!-- 和本地bean一样实现服务 -->
	<bean id="demoService" class="com.tch.test.dubbo.provider.serviceimpl.DemoServiceImpl" />
</beans>

然后是provider的测试类：

package com.tch.test.dubbo.provider.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = null;
        try {
            context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
            context.start();
            context.registerShutdownHook();
            System.in.read();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            context.close();
        }
    }
}

3：consumer：

pom.xml和provider一样：

		<dependency>
			<groupId>com.tch.test.dubbo</groupId>
			<artifactId>service</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.8.4</version>
		</dependency>
		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.7</version>
		</dependency>

然后是spring配置文件applicationContext.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="consumer-of-helloworld-app" />
	<!-- 使用multicast广播注册中心暴露发现服务地址 -->
	<!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->
	<dubbo:registry address="zookeeper://localhost:2181" check="false"></dubbo:registry>
	<!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
	<dubbo:reference id="demoService"
		interface="com.tch.test.dubbo.service.DemoService" />
</beans>

最后是consumer的测试类：

package com.tch.test.dubbo.consumer.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.tch.test.dubbo.service.DemoService;

public class Consumer {

    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = null;
        try {
            context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" });
            context.start();
            context.registerShutdownHook();
            DemoService demoService = (DemoService) context.getBean("demoService"); // 获取远程服务代理
            String hello = demoService.sayHello("world"); // 执行远程方法
            System.out.println(hello); // 显示调用结果
            context.stop();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            if(context != null){
                context.close();
            }
        }

    }

}

接下来，先运行Provider.java，在运行Consumer.java即可看到调用结果（当前前提是zookeeper是启动的啦）：

Hello world

关于zookeeper client的简单demo:

添加依赖：

		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.7</version>
		</dependency>

一方面对zookeeper进行修改等操作，一方面进行监测：

package com.tch.zookeeper.test;
import java.util.UUID;

import org.I0Itec.zkclient.ZkClient;
import org.apache.zookeeper.CreateMode;


public class ZookeeperOperator {
    
    private ZkClient zkClient;
    
    public ZkClient getZkClient() {
        return zkClient;
    }

    public void setZkClient(ZkClient zkClient) {
        this.zkClient = zkClient;
    }


    /**
     * 函数入口
     * @param args
     */
    public static void main( String[] args ) {
       
        ZookeeperOperator bootStrap=new ZookeeperOperator();
        bootStrap.initialize();
        
        try {
            Thread.sleep(100000000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
            
    }
    
  
    /**
     * 初始化zookeeper
     */
    public void initialize() {
        
        String connectionString="localhost:2181";
        int connectionTimeout=50000;
        
        zkClient=new ZkClient(connectionString, connectionTimeout);
        
        if(!zkClient.exists("/root1")) {
            zkClient.create("/root1", new Long(System.currentTimeMillis()), CreateMode.EPHEMERAL);
        }
            
        new Thread(new RootNodeChangeThread()).start();
    }
    
    /**
     * 每20s改变一次 'root1'节点的数据
     * @author yang
     *
     */
    private class RootNodeChangeThread implements Runnable{

        public void run() {
            
            while(true) {
            
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    //ignore
                }
                
                String uuidStr=UUID.randomUUID().toString();    
                
                System.out.println(">>>>>>>>>> 产生随机的 uuid string,'uuidStr'===>"+uuidStr);
                
                zkClient.writeData("/root1", uuidStr);
                
            }
            
        }
        
    }
}

package com.tch.zookeeper.test.slave;
import org.I0Itec.zkclient.IZkDataListener;
import org.I0Itec.zkclient.ZkClient;

public class ZookeeperMonitor {
    
    private ZkClient zkClient;
    
    public ZkClient getZkClient() {
        return zkClient;
    }

    public void setZkClient(ZkClient zkClient) {
        this.zkClient = zkClient;
    }

    /**
     * 初始化zookeeper
     */
    public void initialize() {
        
        String connectionString="localhost:2181";
        int connectionTimeout=500000;
        
        zkClient=new ZkClient(connectionString, connectionTimeout);
        
        new Thread(new Runnable() {
            
            public void run() {
            
                zkClient.subscribeDataChanges("/root1", new IZkDataListener() {
                    
                    public void handleDataDeleted(String dataPath) throws Exception {
                        System.out.println("the node 'dataPath'===>");    
                    }
                    
                    public void handleDataChange(String dataPath, Object data) throws Exception {
                        System.out.println("the node 'dataPath'===>"+dataPath+", data has changed.it's data is "+String.valueOf(data));
                        
                    }
                });
                
            }
            
        }).start();
    }
    
    /**
     * 函数入口
     * @param args
     */
    public static void main( String[] args ) {
       
        ZookeeperMonitor bootStrap=new ZookeeperMonitor();
        bootStrap.initialize();
        
        try {
            Thread.sleep(100000000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
            
    }
}

通过运行结果即可明白

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javascript实用工具方法总结 | JAVA IO和NIO复制文件

2013-10-13 21:01
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