public class Demo2 {

public static void main(String[] args) {

String connectString = "192.168.168.133:2181";

int sessionTimeout = 500000; // 会话时间。设置长一点，如果不够长，则会connect loss

try {

// 建立zookeeper链接

ZooKeeper zk = new ZooKeeper(connectString, sessionTimeout, new Watcher(){

public void process(WatchedEvent event) {

// 监控所有触发的事件

System.out.println("start do something");

EventType type = event.getType(); // 事件类型。枚举

KeeperState state = event.getState(); // 状态。 枚举

// type.getIntValue();

switch (type) {

case None: // int值对应 -1

System.out.println("none 事件触发");

break;

case NodeCreated: // int值对应 1

System.out.println("创建节点事件发生了");

break;

case NodeDeleted: // int值对应 2

System.out.println("删除节点事件发生了");

break;

case NodeDataChanged: // int值对应 3

System.out.println("节点数据改变事件发生了");

break;

case NodeChildrenChanged: // int值对应 4

System.out.println("子节点改变事件发生了");

break;

default:

System.out.println("I do not know what operate you do");

break;

}

// state.getIntValue(); NoSyncConnected 1和Unknown-1

switch (state) {

case Disconnected: // 0

System.out.println("失去连接");

break;

case SyncConnected: // 3

System.out.println("异步链接");

break;

case Expired: // -112

System.out.println("超时过期");

break;

default:

break;

}

System.out.println("end");

}

});

System.out.println("zk创建成功");

List list = zk.getChildren("/", true); // 获取所有节点

if(list != null) {

for(String s : list)

System.out.println(s);

}

// 在/app5节点下创建child节点

zk.create("/app7", "/app8的子节点数据".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); // 会对数据持久化，服务下次启动任然存在

zk.create("/app8", "/app8的子节点数据".getBytes(), Ids.OPEN_ACL_UNSAFE,

CreateMode.PERSISTENT, new StringCallback(){

public void processResult(int rc, String path, Object ctx, String name) {

System.out.println("rc: " + rc);

System.out.println("path: " + path);

System.out.println("Object:" + ctx);

System.out.println("name: " + name);

}

}, "ctx object");

} catch (IOException e) {

e.printStackTrace();

} catch (KeeperException e) {

e.printStackTrace();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

zk每一次操纵都会被监控watcher记录下来

出现这种报错是由于创建节点的时候没有创建父节点 /app1