(2-2)watcher监听节点变化

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package watcher;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;import org.apache.zookeeper.ZooKeeper;public class Zk2{/* * 定义变量 */private static String connectString = "192.168.1.10:2181";private static int sessionTimeout = 55555;private ZooKeeper zookeeper;/* * 初始化zookeeper */public Zk2() throws Exception{zookeeper = new ZooKeeper(connectString, sessionTimeout, new Watcher(){public void process(WatchedEvent arg0) {// TODO Auto-generated method stubtry {System.out.println("持久节点Zk1上的子节点为：："+zookeeper.getChildren("/zk1", this));} catch (KeeperException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});}/* * 创建持久节点 */public void createPNode() throws Exception {if((zookeeper.exists("/zk1", false)) == null){zookeeper.create("/zk1", "mybook".getBytes(),ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);}}/* * 创建临时子节点 */public void createENode() throws Exception {System.out.println("创建临时子节点：");for (int i=0; i < 10; i++) {String str = String.valueOf(i);zookeeper.create("/zk1/"+str,"myconputer".getBytes(),ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);Thread.sleep(500);}System.out.println("临时子节点创建完毕！"+"\n");}/* * 删除临时子节点 */public void deleteENode() throws Exception {System.out.println("开始删除临时子节点：");for (int i=0; i < 10; i++) {String str = String.valueOf(i);zookeeper.delete("/zk1/"+str,-1);Thread.sleep(500);}System.out.println("临时子节点删除完毕！");}/* * 关闭连接 */public void closeZk() throws Exception{zookeeper.close();}public static void main(String args[]) throws Exception {// 实例化一个Zookeeper实例Zk2 baolibin = new Zk2();// 创建持久节点 baolibin.createPNode();// 创建临时节点baolibin.createENode();// 休眠   给删除节点操作  设定执行时间Thread.sleep(5000);// 删除临时节点baolibin.deleteENode();//休眠  给关闭Zookeeper连接  设定执行时间Thread.sleep(5000);//关闭baolibin.closeZk();}}

log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.创建临时子节点：持久节点Zk1上的子节点为：：[]持久节点Zk1上的子节点为：：[0]持久节点Zk1上的子节点为：：[1, 0]持久节点Zk1上的子节点为：：[2, 1, 0]持久节点Zk1上的子节点为：：[3, 2, 1, 0]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 4]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 5, 4]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 6, 5, 4]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 7, 6, 5, 4]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 7, 6, 5, 4, 8]持久节点Zk1上的子节点为：：[3, 2, 1, 0, 7, 6, 5, 4, 9, 8]临时子节点创建完毕！开始删除临时子节点：持久节点Zk1上的子节点为：：[3, 2, 1, 7, 6, 5, 4, 9, 8]持久节点Zk1上的子节点为：：[3, 2, 7, 6, 5, 4, 9, 8]持久节点Zk1上的子节点为：：[3, 7, 6, 5, 4, 9, 8]持久节点Zk1上的子节点为：：[7, 6, 5, 4, 9, 8]持久节点Zk1上的子节点为：：[7, 6, 5, 9, 8]持久节点Zk1上的子节点为：：[7, 6, 9, 8]持久节点Zk1上的子节点为：：[7, 9, 8]持久节点Zk1上的子节点为：：[9, 8]持久节点Zk1上的子节点为：：[9]持久节点Zk1上的子节点为：：[]临时子节点删除完毕！

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