zookeeper通知watcher

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import org.apache.zookeeper.*;import java.io.IOException;/** * Created with IntelliJ IDEA. * User: Administrator * Date: 17-7-12 * Time: 下午3:03 * To change this template use File | Settings | File Templates. */public class ZkWatchTest {    // 创建一个与服务器的连接    public static void main(String args[]) throws IOException, InterruptedException, KeeperException {        int sessionTime = 2000;        ZooKeeper zk  = new ZooKeeper("10.2.4.12:2181,10.2.4.13:2181,10.2.4.14:2181", 3000, new Watcher() {            @Override            public void process(WatchedEvent watchedEvent) {                System.out.println("已经触发了" + watchedEvent.getType() + "事件！");            }        });        // 创建一个目录节点        zk.create("/testRootPath", "testRootData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);// 创建一个子目录节点        zk.create("/testRootPath/testChildPathOne", "testChildDataOne".getBytes(),ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);        System.out.println(new String(zk.getData("/testRootPath",false,null)));// 取出子目录节点列表        System.out.println(zk.getChildren("/testRootPath",true));// 修改子目录节点数据        zk.setData("/testRootPath/testChildPathOne","modifyChildDataOne".getBytes(),-1);        System.out.println("目录节点状态：["+zk.exists("/testRootPath",true)+"]");// 创建另外一个子目录节点        zk.create("/testRootPath/testChildPathTwo", "testChildDataTwo".getBytes(),                ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);        System.out.println(new String(zk.getData("/testRootPath/testChildPathTwo",true,null)));// 删除子目录节点        zk.delete("/testRootPath/testChildPathTwo",-1);        zk.delete("/testRootPath/testChildPathOne",-1);// 删除父目录节点        zk.delete("/testRootPath",-1);// 关闭连接        zk.close();    }}
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