上篇简单的介绍了单点部署ZooKeeper及节点管理。

这里介绍下如何通过java客户端进行各个节点的管理。

具体就不一一介绍，相信从代码的注释中就可以看明白

首先创建一个zookeeper的基础类，里面包含了基本的节点管理方法，如下：

package com.zktest.newtest;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.CountDownLatch;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;

public class BaseZookeeper implements Watcher
{

	public ZooKeeper zooKeeper;

	private static final int SESSION_TIME_OUT = 2000;

	private CountDownLatch countDownLatch = new CountDownLatch(1);

	/**
	 * 连接zookeeper
	 * 
	 * @param host
	 * @throws IOException
	 * @throws InterruptedException
	 */
	public void connectZookeeper(String host) throws IOException,
			InterruptedException
	{
		zooKeeper = new ZooKeeper(host, SESSION_TIME_OUT, this);
		countDownLatch.await();
		System.out.println("zookeeper connect ok");

	}

	/**
	 * 实现watcher的接口方法，当连接zookeeper成功后，zookeeper会通过此方法通知watcher<br>
	 * 此处为如果接受到连接成功的event，则countDown，让当前线程继续其他事情。
	 */
	@Override
	public void process(WatchedEvent event)
	{
		if (event.getState() == KeeperState.SyncConnected)
		{
			System.out.println("watcher received event");
			countDownLatch.countDown();
		}
	}

	/**
	 * 根据路径创建节点，并且设置节点数据
	 * @param path
	 * @param data
	 * @return
	 * @throws KeeperException
	 * @throws InterruptedException
	 */
	public String createNode(String path, byte[] data) throws KeeperException,
			InterruptedException
	{
		return this.zooKeeper.create(path, data, Ids.OPEN_ACL_UNSAFE,
				CreateMode.PERSISTENT);
	}

	/**
	 * 根据路径获取所有孩子节点
	 * 
	 * @param path
	 * @return
	 * @throws KeeperException
	 * @throws InterruptedException
	 */
	public List<String> getChildren(String path) throws KeeperException,
			InterruptedException
	{
		return this.zooKeeper.getChildren(path, false);
	}

	public Stat setData(String path, byte [] data, int version) throws KeeperException, InterruptedException
	{
		return this.zooKeeper.setData(path, data, version);
	}
	
	/**
	 * 根据路径获取节点数据
	 * 
	 * @param path
	 * @return
	 * @throws KeeperException
	 * @throws InterruptedException
	 */
	public byte[] getData(String path) throws KeeperException,
			InterruptedException
	{
		return this.zooKeeper.getData(path, false, null);
	}

	/**
	 * 删除节点
	 * 
	 * @param path
	 * @param version
	 * @throws InterruptedException
	 * @throws KeeperException
	 */
	public void deletNode(String path, int version)
			throws InterruptedException, KeeperException
	{
		this.zooKeeper.delete(path, version);
	}

	/**
	 * 关闭zookeeper连接
	 * 
	 * @throws InterruptedException
	 */
	public void closeConnect() throws InterruptedException
	{
		if (null != zooKeeper)
		{
			zooKeeper.close();
		}
	}

}

package com.spg.zktest.newtest;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import org.apache.zookeeper.KeeperException;

public class Client
{

	/**
	 * @param args
	 * @throws InterruptedException 
	 * @throws IOException 
	 * @throws KeeperException 
	 */
	public static void main(String[] args) throws IOException, InterruptedException, KeeperException
	{
		BaseZookeeper baseZookeeper = new BaseZookeeper();
		
		String host = "192.168.183.128:2181";
		
		// 连接zookeeper
		baseZookeeper.connectZookeeper(host);
		System.out.println("--------connect zookeeper ok-----------");
		
		// 创建节点
		byte [] data = {1, 2, 3, 4, 5};
		String result = baseZookeeper.createNode("/test", data);
		System.out.println(result);
		System.out.println("--------create node ok-----------");
		
		// 获取某路径下所有节点
		List<String> children = baseZookeeper.getChildren("/");
		for (String child : children)
		{
			System.out.println(child);
		}
		System.out.println("--------get children ok-----------");
		
		// 获取节点数据
		byte [] nodeData = baseZookeeper.getData("/test");
		System.out.println(Arrays.toString(nodeData));
		System.out.println("--------get node data ok-----------");
		
		// 更新节点数据
		data = "test data".getBytes();
		baseZookeeper.setData("/test", data, 0);
		System.out.println("--------set node data ok-----------");
		
		nodeData = baseZookeeper.getData("/test");
		System.out.println(Arrays.toString(nodeData));
		System.out.println("--------get node new data ok-----------");
		
		baseZookeeper.closeConnect();
		System.out.println("--------close zookeeper ok-----------");
	}

}

1：根目录下节点

2：查看test节点信息

OK，测试结果到此结束。

ZooKeeper之java客户端访问-入门介绍,布布扣,bubuko.com

ZooKeeper之java客户端访问-入门介绍