zookeeper原生api操作

<dependencies>
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.14</version>
    </dependency>
</dependencies>

public class getNoetNode implements Watcher {

    private  static ZooKeeper zooKeeper;

    public static void main(String[] args) throws InterruptedException, IOException {
        zooKeeper = new ZooKeeper("119.45.52.68:2181",10000,new getNoetNode());
        //countDownLatch.await();
        Thread.sleep(Integer.MAX_VALUE);
    }

    @Override
    public void process(WatchedEvent event) {
        if(event.getType() ==Event.EventType.NodeChildrenChanged){
//再次获取子节点数据，监听子节点变化
            try {
                List<String> children =
                        zooKeeper.getChildren(event.getPath(), true);
                System.out.println(children);
            } catch (KeeperException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        //当连接创建了，服务端发送给客户端SyncConnected事件
        if(event.getState() == Event.KeeperState.SyncConnected){
            try {
//调⽤获取单个节点数据⽅法
                getNodeData();
                getChildren();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println();
    }

    private static void getNodeData() throws Exception {
        byte[] data = zooKeeper.getData("/persistent/children", true,
                null);
        System.out.println(new String(data,"utf-8"));
    }

    public static  void getChildren() throws Exception{
        List<String> childrens = zooKeeper.getChildren("persistent",true);
        System.out.println(childrens);

    }
}

public class UpdateNode implements Watcher {

    private static ZooKeeper zooKeeper;

    public static void main(String[] args) throws Exception{
        zooKeeper = new ZooKeeper("119.45.52.68:2181",6000,new UpdateNode());
        Thread.sleep(Integer.MAX_VALUE);

    }
    @Override
    public void process(WatchedEvent event) {
        try {
            byte[] before = zooKeeper.getData("/persistent/children",false,null);
            System.out.println("修改前的值"+new String(before));
           Stat stat = zooKeeper.setData("/persistent","客户端修改的内容".getBytes(),-1);
            System.out.println(stat);
            byte[] after = zooKeeper.getData("/persistent/children",false,null);
            System.out.println("修改后的值"+new String(after));
        }catch (Exception e){
            e.printStackTrace();
        }

    }
}

public class DeleteNode implements Watcher {
    private static  ZooKeeper zooKeeper;
    public static void main(String[] args) throws  Exception{
        zooKeeper = new ZooKeeper("119.45.52.68:2181",6000,new UpdateNode());
        Thread.sleep(Integer.MAX_VALUE);
    }
    @Override
    public void process(WatchedEvent event) {
        try {
            Stat exists = zooKeeper.exists("/persistent/children", false);
            System.out.println(exists == null ? "该节点不存在":"该节点存在");
            zooKeeper.delete("/persistent/children",-1);
            Stat exists2 = zooKeeper.exists("/persistent/children", false);
            System.out.println(exists2 == null ? "该节点不存在":"该节点存在");
        }catch (Exception e){
            e.printStackTrace();
        }

    }
}