Zookeeper集群Java操作（Zookeeper3.4.5）

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1.zk 集群 Java 简单操作

1.0 包目录结构

lib 取自 zookpeeper 官方压缩包（基于 zk3.4.5 测试通过）

Zookeeper 集群 Java 操作（Zookeeper3.4.5）

1.1 AbstractZooKeeper.java

package com.ccy.zk;

import java.io.IOException;
import java.util.concurrent.CountDownLatch;

import org.apache.log4j.Logger;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;

/**
*
* 
* Title: AbstractZooKeeper.java
* Package com.ccy.zk
* 
* 
* Description: TODO
* 
* @author Tom.Cai
* @created 2015-4-13 下午 9:48:50
* @version V1.0
*
*/
public class AbstractZooKeeper implements Watcher {
protected Logger logger = Logger.getLogger(AbstractZooKeeper.class);

// 缓存时间
private static final int SESSION_TIME = 2000;
protected ZooKeeper zooKeeper;
protected CountDownLatch countDownLatch=new CountDownLatch(1);

// 连接 zk 集群
public void connect(String hosts) throws IOException, InterruptedException{
zooKeeper = new ZooKeeper(hosts,SESSION_TIME,this);
countDownLatch.await();
}
//zk 处理
@Override
public void process(WatchedEvent event) {
if(event.getState()==KeeperState.SyncConnected){
countDownLatch.countDown();
}
}

// 关闭集群
public void close() throws InterruptedException{
zooKeeper.close();
}
}

1.2 ZooKeeperOperator.java(测试类)

package com.ccy.zk;

import java.util.List;

import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;

/**
*
* 
* Title: ZooKeeperOperator.java
* Package com.ccy.zk
* 
* 
* Description: TODO
* 
* @author Tom.Cai
* @created 2015-4-13 下午 9:49:00
* @version V1.0
*
*/
public class ZooKeeperOperator extends AbstractZooKeeper {

private static Logger logger = Logger.getLogger(ZooKeeperOperator.class);

/**
*
* 创建 znode
*
*/
public void create(String path,byte[] data)throws KeeperException, InterruptedException{
/**
* 此处采用的是创建的是持久化节点：PERSISTENT 表示不会因连接的断裂而删除节点
* EPHEMERAL 表示 The znode will be deleted upon the client’s disconnect.
*/
this.zooKeeper.create(path, data, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
/**
*
* 获取节点信息
*
*/
public void getChild(String path) throws KeeperException, InterruptedException{
try{
List<String> list=this.zooKeeper.getChildren(path, false);
if(list.isEmpty()){
logger.info(path+” 中没有节点 ”);
System.out.println(path+” 中没有节点 ”);
}else{
for(String child:list){
System.out.println(“ 节点：”+child);
}
}
}catch (KeeperException.NoNodeException e) {
// TODO: handle exception
throw e;
}
}
/**
*
* 获取节点数据
*
*/
public byte[] getData(String path) throws KeeperException, InterruptedException {
return this.zooKeeper.getData(path, false,null);
}

/**
* 修改节点数据
*/
public Stat setDate(String path,byte[] data,int version) throws KeeperException, InterruptedException{
return this.zooKeeper.setData(path, data, version);
}

/**
* 删除节点
*/
public void deleteNode(final String path,int version) throws InterruptedException, KeeperException{
this.zooKeeper.delete(path, version);
}

public static void main(String[] args) {
try {
ZooKeeperOperator zkoperator = new ZooKeeperOperator();
zkoperator.connect(“192.168.80.100”);

// 操作 1：创建一个持久化节点
//zkoperator.create(“/test1”, “zk”.getBytes());
//zkoperator.create(“/test1/test11”, “zk”.getBytes());
//zkoperator.create(“/test1/test12”, “zk”.getBytes());

// 操作 2：取出原有的节点
//byte[] b = zkoperator.getData(“/test1”);
//System.out.println(new String(b));

// 操作 3：设置节点数据
//zkoperator.setDate(“/test1”, “zk1”.getBytes(), 1);

// 操作 4：删除节点操作
zkoperator.deleteNode(“/test1/test12”, 0);

// 获取子节点
// zkoperator.getChild(“/test1”);