本文共 3624 字，大约阅读时间需要 12 分钟。

参考了网上的一个例子，现在程序可以跑了，但是由于时间原因，明天再做深入研究。

这里先记下参考的例子及其代码()

package zookeeper;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 MyZookeeper implements Watcher {	private ZooKeeper zookeeper;	/**	 * 超时时间	 */	private static final int SESSION_TIME_OUT = 2000;	private CountDownLatch countDownLatch = new CountDownLatch(1);	@Override	public void process(WatchedEvent event) {		if (event.getState() == KeeperState.SyncConnected) {			System.out.println("Watch received event");			countDownLatch.countDown();		}	}	/**	 * 连接zookeeper	 * 	 * @param host	 * @throws Exception	 */	public void connectZookeeper(String host) throws Exception {		zookeeper = new ZooKeeper(host, SESSION_TIME_OUT, this);		countDownLatch.await();		System.out.println("zookeeper connection success");	}	/**	 * 创建节点	 * 	 * @param path	 * @param data	 * @throws Exception	 */	public String createNode(String path, String data) throws Exception {		return this.zookeeper.create(path, data.getBytes(),				Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);	}	/**	 * 获取路径下所有子节点	 * 	 * @param path	 * @return	 * @throws KeeperException	 * @throws InterruptedException	 */	public List
   
     getChildren(String path) throws KeeperException,			InterruptedException {		List
    
      children = zookeeper.getChildren(path, false);		return children;	}	/**	 * 获取节点上面的数据	 * 	 * @param path	 *            路径	 * @return	 * @throws KeeperException	 * @throws InterruptedException	 */	public String getData(String path) throws KeeperException,			InterruptedException {		byte[] data = zookeeper.getData(path, false, null);		if (data == null) {			return "";		}		return new String(data);	}	/**	 * 设置节点信息	 * 	 * @param path	 *            路径	 * @param data	 *            数据	 * @return	 * @throws KeeperException	 * @throws InterruptedException	 */	public Stat setData(String path, String data) throws KeeperException,			InterruptedException {		Stat stat = zookeeper.setData(path, data.getBytes(), -1);		return stat;	}	/**	 * 删除节点	 * 	 * @param path	 * @throws InterruptedException	 * @throws KeeperException	 */	public void deleteNode(String path) throws InterruptedException,			KeeperException {		zookeeper.delete(path, -1);	}	/**	 * 获取创建时间	 * 	 * @param path	 * @return	 * @throws KeeperException	 * @throws InterruptedException	 */	public String getCTime(String path) throws KeeperException,			InterruptedException {		Stat stat = zookeeper.exists(path, false);		return String.valueOf(stat.getCtime());	}	/**	 * 获取某个路径下孩子的数量	 * 	 * @param path	 * @return	 * @throws KeeperException	 * @throws InterruptedException	 */	public Integer getChildrenNum(String path) throws KeeperException,			InterruptedException {		int childenNum = zookeeper.getChildren(path, false).size();		return childenNum;	}	/**	 * 关闭连接	 * 	 * @throws InterruptedException	 */	public void closeConnection() throws InterruptedException {		if (zookeeper != null) {			zookeeper.close();		}	}}
    
   

package zookeeper;import java.util.List;/** * Hello world! *  */public class App {	public static void main(String[] args) throws Exception {		MyZookeeper zookeeper = new MyZookeeper();		zookeeper.connectZookeeper("127.0.0.1:2181");		List
   
     children = null;		children = zookeeper.getChildren("/");		System.out.println(children);		zookeeper.closeConnection();	}}
   

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