Java链接Zookeeper

最新推荐文章于 2025-06-08 10:40:06 发布

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本文介绍了一个实用的 Zookeeper 工具类实现，包括如何初始化连接、执行 CRUD 操作及关闭连接等基本功能。通过具体示例展示了如何创建、读取、更新和删除 Zookeeper 中的数据节点。

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package com.zookeeper.utils;

import java.io.IOException;

import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

/**
 * Zookeeper  
 */
public class ZookeeperUtils{
	
	private	Logger logger = Logger.getLogger(this.getClass());
	//创建一个watcher对象,当我们对Zookeeper进行修改的时候都会触发该事件
	private Watcher watcher = new Watcher() {
		@Override
		public void process(WatchedEvent event) {
			logger.debug("--------ZK Watcher---------");
		}
	};
	
	//初始化Zookeeper
	private ZooKeeper zooKeeper ;
	
	public void zookeeperInit() throws IOException {
		//多个ip使用，号分割
		zooKeeper = new ZooKeeper("192.168.100.128:2180, 192.168.100.128:2182, 192.168.100.128:2183", 20000 , watcher);
	} 
	
	public void ZKOption() throws Exception, InterruptedException {
		logger.debug("-----ZK Option-----");
		//参数一：创建的路径/zoo1          参数二：节点上的数据       参数三：权限    参数四：节点类型
		zooKeeper.create("/zoo1", "zoo1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
		//添加watcher ，对zoo1进行监控变化-->获取数据 ,这个监控只会对下次操作节点起到作用
		zooKeeper.getData("/zoo1", this.watcher, null);
		//修改zoo1节点
		zooKeeper.setData("/zoo1", "hello".getBytes(), -1);
		//----------------------获取数据----------------------------
		logger.debug("获取第一次节点信息："+zooKeeper.getData("/zoo1", this.watcher, null));
		System.out.println("获取第二次数据信息："+zooKeeper.getData("/zoo1", this.watcher, null));
		//-----------------这次操作的节点不会进行监控-----------------------
		zooKeeper.setData("/zoo1", "world".getBytes(), -1);
		//----------------------获取数据----------------------------
		logger.debug("获取第二次数据信息："+zooKeeper.getData("/zoo1", this.watcher, null));
		System.out.println("获取第二次数据信息："+zooKeeper.getData("/zoo1", this.watcher, null));
		//查看节点状态
		logger.debug("节点状态："+zooKeeper.getState());
		System.out.println("节点状态："+zooKeeper.getState());
		//删除节点
		zooKeeper.delete("/zoo1", -1);
		System.out.println(zooKeeper.exists("/zoo1", false));
	}
	
	//关闭Zookeeper
	public void closeZookeeper() throws Exception {
		zooKeeper.close();
	}
	
	
	public static void main(String[] args) throws Exception {
		ZookeeperUtils utils = new ZookeeperUtils();
		utils.zookeeperInit();
		utils.ZKOption();
		utils.closeZookeeper();
	}
	
}