常用方法：

注意点：

watcher 的触发，为一次性。

测试程序

package zookeeper;

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

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

public class ZookeeperTest {

public static final int Zookeeper_SESSION_TIMEOUT = 20000;

static ZooKeeper zk;

static class TestWatcher implements Watcher {

@Override
public void process(WatchedEvent event) {
// TODO Auto-generated method stub
System.out.println("come from TestWatcher-> process");
}

}

static TestWatcher watcher = new TestWatcher();

/**
* new ZooKeeper
* 初始化 ZooKeeper 实例
*/
public static void createZKInstance() throws IOException, KeeperException,
InterruptedException {
zk = new ZooKeeper("ip:port,ip:port", Zookeeper_SESSION_TIMEOUT,watcher);
}

/**
* create
* 创建节点
*/
public static void createNode(String node) throws IOException, InterruptedException,KeeperException
{
if (zk.exists(node, null) == null) {
zk.create(node,node.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
}

/**
* exists
* 判断节点是否存在
*/
public static boolean isExists(String node) throws InterruptedException,
KeeperException {
if (zk.exists(node, null) == null) {
return false;
}
return true;
}

/**
* getChildren
* 获取一个节点的子节点列表
*/
public static List getChildren(String node) throws KeeperException, InterruptedException{
return zk.getChildren(node, null);
}

/**
* 返回节点的数据
*/
public static byte[] getDate(String path ) throws KeeperException, InterruptedException{
return zk.getData(path, null, null);
}

public static void main(String[] args) {
try {
createZKInstance();

createNode("/testnodes");

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (KeeperException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

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