zookeeper 简单java客户端

package com.gcx.zookeeper;

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;
import org.apache.zookeeper.data.Stat;
import org.junit.Before;
import org.junit.Test;

public class Tests {

	private static final String connectString ="192.168.48.156:2181,192.168.53.141:2181,192.168.48.154:2181";
	private static final int sessionTimeout=60000;
  

	ZooKeeper zkClient = null;

	@Before
	public void init() throws Exception {
		zkClient = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
			@Override
			public void process(WatchedEvent event) {
				// 收到事件通知后的回调函数（应该是我们自己的事件处理逻辑）
				System.out.println(event.getType() + "---" + event.getPath());
				try {
					zkClient.getChildren("/", true);
				} catch (Exception e) {
				}
			}
		});

	}

		/**
		 * 数据的增删改查
		 * 
		 * @throws InterruptedException
		 * @throws KeeperException
		 */

		// 创建数据节点到zk中
		public void testCreate() throws KeeperException, InterruptedException {
			// 参数1：要创建的节点的路径 参数2：节点大数据 参数3：节点的权限 参数4：节点的类型
			String nodeCreated = zkClient.create("/eclipse", "hellozk".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
			//上传的数据可以是任何类型，但都要转成byte[]
		}

		//判断znode是否存在
		@Test	
		public void testExist() throws Exception{
			Stat stat = zkClient.exists("/eclipse", false);
			System.out.println(stat==null?"not exist":"exist");
			
			
		}
		
		// 获取子节点
		@Test
		public void getChildren() throws Exception {
			List<String> children = zkClient.getChildren("/", true);
			for (String child : children) {
				System.out.println(child);
			}
			Thread.sleep(Long.MAX_VALUE);
		}

		//获取znode的数据
		@Test
		public void getData() throws Exception {
			
			byte[] data = zkClient.getData("/eclipse", false, null);
			System.out.println(new String(data));
			
		}
		
		//删除znode
		@Test
		public void deleteZnode() throws Exception {
			
			//参数2：指定要删除的版本，-1表示删除所有版本
			zkClient.delete("/eclipse", -1);
			
			
		}
		//删除znode
		@Test
		public void setData() throws Exception {
			
			zkClient.setData("/app1", "imissyou angelababy".getBytes(), -1);
			
			byte[] data = zkClient.getData("/app1", false, null);
			System.out.println(new String(data));
			
		}
		
		
	}