Zookeeper集群Java操作（zookeeper3.4.5）

1.zk集群java简单操作

1.0 包目录结构

lib取自zookpeeper官方压缩包（基于zk3.4.5测试通过）

1.1 AbstractZooKeeper.java

package com.ccy.zk;

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

import org.apache.log4j.Logger;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;

/**
 *
 * <p>
 * Title: AbstractZooKeeper.java
 * Package com.ccy.zk
 * </p>
 * <p>
 * Description: TODO
 * <p>
 * @author Tom.Cai
 * @created 2015-4-13 下午9:48:50
 * @version V1.0
 *
 */
public class AbstractZooKeeper implements Watcher {
	protected Logger logger = Logger.getLogger(AbstractZooKeeper.class); 

    //缓存时间
     private static final int SESSION_TIME   = 2000;
     protected ZooKeeper zooKeeper;
     protected CountDownLatch countDownLatch=new CountDownLatch(1);  

     //连接zk集群
     public void connect(String hosts) throws IOException, InterruptedException{
            zooKeeper = new ZooKeeper(hosts,SESSION_TIME,this);
            countDownLatch.await();
      }
     //zk处理
    @Override
    public void process(WatchedEvent event) {
        if(event.getState()==KeeperState.SyncConnected){
            countDownLatch.countDown();
        }
    }  

    //关闭集群
    public void close() throws InterruptedException{
        zooKeeper.close();
    }
} 

1.2 ZooKeeperOperator.java(测试类)

package com.ccy.zk;

import java.util.List;

import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;

/**
 *
 * <p>
 * Title: ZooKeeperOperator.java
 * Package com.ccy.zk
 * </p>
 * <p>
 * Description: TODO
 * <p>
 * @author Tom.Cai
 * @created 2015-4-13 下午9:49:00
 * @version V1.0
 *
 */
public class ZooKeeperOperator extends AbstractZooKeeper {

	private static Logger logger = Logger.getLogger(ZooKeeperOperator.class); 

	/**
	 *
	 *创建znode
	 *
	 */
	public void create(String path,byte[] data)throws KeeperException, InterruptedException{
		/**
		 * 此处采用的是创建的是持久化节点：PERSISTENT表示不会因连接的断裂而删除节点
		 * EPHEMERAL 表示The znode will be deleted upon the client's disconnect.
		 */
		this.zooKeeper.create(path, data, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
	}
	/**
	 *
	 *获取节点信息
	 *
	 */
	public void getChild(String path) throws KeeperException, InterruptedException{
		try{
			List<String> list=this.zooKeeper.getChildren(path, false);
			if(list.isEmpty()){
				logger.info(path+"中没有节点");
				System.out.println(path+"中没有节点");
			}else{
				for(String child:list){
					System.out.println("节点："+child);
				}
			}
		}catch (KeeperException.NoNodeException e) {
			// TODO: handle exception
			 throw e;
		}
	}
	/**
	 *
	 *获取节点数据
	 *
	 */
	public byte[] getData(String path) throws KeeperException, InterruptedException {
        return  this.zooKeeper.getData(path, false,null);
    }  

	/**
	 * 修改节点数据
	 */
	public Stat setDate(String path,byte[] data,int version) throws KeeperException, InterruptedException{
		return this.zooKeeper.setData(path, data, version);
	}

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

	 public static void main(String[] args) {
		 try {
	            ZooKeeperOperator zkoperator = new ZooKeeperOperator();
	            zkoperator.connect("192.168.80.100");

	            //操作1：创建一个持久化节点
	            //zkoperator.create("/test1", "zk".getBytes());
	            //zkoperator.create("/test1/test11", "zk".getBytes());
	            //zkoperator.create("/test1/test12", "zk".getBytes());

	            //操作2：取出原有的节点
	            //byte[] b = zkoperator.getData("/test1");
	            //System.out.println(new String(b));

	            //操作3：设置节点数据
	            //zkoperator.setDate("/test1", "zk1".getBytes(), 1);

	            //操作4：删除节点操作
	            zkoperator.deleteNode("/test1/test12", 0);

	            //获取子节点
	           // zkoperator.getChild("/test1");

	            zkoperator.close();   

	        } catch (Exception e) {
	            e.printStackTrace();
	        }   

	}
}

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