zookeeper連接，創建，修改，刪除操作

package com.chen;

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.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.ZooDefs.Ids;

public class ZkWatcher implements Watcher{

	/**
	 * 集羣鏈接地址
	 */
	private static final String CONNECT_ADDR = "192.168.1.104:2181,192.168.1.105:2181,192.168.1.106:2181";
	
	/**
	 * session超時時間
	 */
	private static final int SESSION_OUTTIME = 2000;
	
	private static ZooKeeper zooKeeper = null;
	
	public ZkWatcher() {
		this.createConnection(CONNECT_ADDR, SESSION_OUTTIME);
	}
	public void process(WatchedEvent watchedEvent) {
		//zk節點變更，添加，刪除，修改時間監聽
		KeeperState keeperState = watchedEvent.getState();
		//事件類型
		EventType eventType = watchedEvent.getType();
		//節點名稱
		String path = watchedEvent.getPath();
		if(KeeperState.SyncConnected == keeperState){
			//連接類型
			if(EventType.None == eventType){
				//建立連接
				System.out.println("建立zk連接成功");
			}
			//創建類型
			if(EventType.NodeCreated == eventType){
				System.out.println("####事件通知,當前創建一個新的節點####路徑:" + path);
			}
			//修改類型
			if(EventType.NodeDataChanged == eventType){
				System.out.println("####事件通知,當前創建一個修改節點####路徑:" + path);
			}
			//刪除類型
			if(EventType.NodeDeleted == eventType){
				System.out.println("####事件通知,當前創建一個刪除節點####路徑:" + path);
			}
		}
	}
	
	//創建鏈接
	public void createConnection(String address,int sessionTimeout){
		try {
			zooKeeper = new ZooKeeper(address,sessionTimeout,this);
		} catch (Exception e) {
			// TODO: handle exception
		}
	}

	//創建節點
	public void createNode(String path,String data){
		try {
			String result = zooKeeper.create(path, data.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
			System.out.println("創建節點成功......result:"+result);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	//修改節點
	public void updateNode(String path,String data){
		try {
			zooKeeper.setData(path, data.getBytes(), -1);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	//刪除節點
	public void deleteNode(String path){
		try {
			zooKeeper.delete(path, -1);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	//關閉
	public void close(){
		try {
			if(zooKeeper != null){
				zooKeeper.close();
			}
		} catch (Exception e) {
			
		}
	}
	
	public static void main(String[] args) throws KeeperException, InterruptedException {
		ZkWatcher zkWatcher = new ZkWatcher();
		
		String path = "/parent1";
		
		//設置實時監聽path
		zooKeeper.exists(path, true);
		
//		zkWatcher.createNode(path, "123456");
//		zkWatcher.updateNode(path, "9999");
		zkWatcher.deleteNode(path);
		
		zkWatcher.close();
	}
}

package com.chen;

import java.io.IOException;
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.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;

public class zookeeperDemo {

	/**
	 * 集羣鏈接地址
	 */
	private static final String CONNECT_ADDR = "192.168.1.104:2181,192.168.1.105:2181,192.168.1.106:2181";
	
	/**
	 * session超時時間
	 */
	private static final int SESSION_OUTTIME = 2000;
	
	/**
	 * 信號量，阻塞程序執行，用戶等待zookeeper鏈接成功，發送成功信號
	 */
	private static final CountDownLatch countDownLatch = new CountDownLatch(1);
	
	public static void main(String[] args) throws InterruptedException, KeeperException {
		try {
			ZooKeeper zooKeeper = new ZooKeeper(CONNECT_ADDR, SESSION_OUTTIME, new Watcher(){

				public void process(WatchedEvent watchedEvent) {
					//獲取時間的狀態
					KeeperState keeperState = watchedEvent.getState();
					EventType eventType = watchedEvent.getType();
					//如果建立連接
					if(keeperState.SyncConnected == keeperState){
						if(EventType.None == eventType){
							//如果建立鏈接，則發送信號量,讓後阻塞程序向下執行
							countDownLatch.countDown();
							System.out.println("zk,建立連接");
						}
					}
				}
				
			});
			
			//進行阻塞
			countDownLatch.await();
			//創建父節點
//			String result = zooKeeper.create("/testRott", "12245465".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
//			System.out.println("result:" + result);
			//創建子節點
			String result = zooKeeper.create("/testRott/children", "children 12245465".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
			System.out.println("result:"+result);
			zooKeeper.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

這些都是zookeeper最基本的東西，沒什麼好說的，僅僅只是做個筆記。