前言： 码字辛苦，直接上demo。
一、windows 集群安装
1、复制3分zoo?.cfg的文件
每份文件分别是
1.1 zoo1.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=D:\\zookeeper-3.4.12\\data\\1 //持续递增
dataLogDir=D:\\zookeeper-3.4.12\\log\\1 //持续递增
clientPort=2181 //持续递增
server.1=127.0.0.1:2887:3887 //第一个端口此server和集群中 Leader服务器交换信息的端口,第二个端口是选举端口
server.2=127.0.0.1:2888:3888
server.3=127.0.0.1:2889:3889
1.2 zoo2.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=D:\\zookeeper-3.4.12\\data\\2
dataLogDir=D:\\zookeeper-3.4.12\\log\\2
clientPort=2182
server.1=127.0.0.1:2887:3887
server.2=127.0.0.1:2888:3888
server.3=127.0.0.1:2889:3889
1.3 zoo3.cfg 略！
2、需要复制3个启动脚本.并且指定启动脚本zkServer?.cmd内的增加一个参数 set ZOOCFG=../conf/zoo?.cfg
3、在data/?下创建一个文本文件myid (无后缀) 并且依次填上?的数值
4、启动即可！二、watch测试demo
package com.wj.base;
import java.io.IOException;
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.Test;
/**
* Wacth事件触发的演示!
* 一句话攻略： 首先只有3个get类型的方法能够设置触发watch
* exists 触发 目标节点的创建，删除，数据更新
* getData 比较上面----目标节点除了创建。删除，和更新都可以触发
* getChildren 子节点的创建和删除会触发NodeChildrenChanged,以及父节点本身的删除.
*/
public class WacthDemo {
private ZooKeeper connection() throws IOException{
return new ZooKeeper("localhost:"+2181,10000,new Watcher(){
public void process(WatchedEvent event) {
if(event.getPath()==null){ //连接时会触发None的事件
System.out.println("初始化连接"+event.getType());
}else if(event.getType()==Event.EventType.NodeDeleted){
System.out.println("[节点删除]"+event.getPath()+":"+event.getType());
}else if(event.getType()==Event.EventType.NodeCreated){
System.out.println("[节点创建]"+event.getPath()+":"+event.getType());
}else if(event.getType()==Event.EventType.NodeDataChanged){
System.out.println("[节点更新]"+event.getPath()+":"+event.getType());
}else if(event.getType()==Event.EventType.NodeChildrenChanged){
System.out.println("[子节点更新(父增删子节点)]"+event.getPath()+":"+event.getType());
}
}
});
}
/**
* 测试exists事件: --> 被监视的Znode创建(create:NodeCreate)、删除(delete:NodeDelete)、更新(setData:NodeDataChange)时被触发。
*/
@Test
public void test1() throws IOException, KeeperException, InterruptedException{
ZooKeeper zk = connection();
Stat stat = zk.exists("/root", true);
if(stat==null){
zk.create("/root", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
Stat stat2 = zk.exists("/root", true);
if(stat2==null){
zk.create("/root", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}else{
zk.setData("/root", "haha".getBytes(), -1);//-1好像表示全部版本
}
//zk.delete("/root",-1); 此时不触发事件，因为一个get类型方法只能触发它对应的事件一次。
Stat stat3 = zk.exists("/root", true);
if(stat3!=null){
zk.delete("/root",-1);
}
}
/**
* 测试getData事件: --> 被监视的Znode删除(delete:NodeDelete)、更新(setData:NodeDataChange)时被触发。
* @throws InterruptedException
* @throws KeeperException
*/
@Test
public void test2() throws IOException, KeeperException, InterruptedException{
ZooKeeper zk = connection();
Stat stat = zk.exists("/root", false);
if(stat==null){
zk.create("/root", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
}
byte[] data1 = zk.getData("/root", true, null);
System.out.println(new String(data1));
zk.setData("/root", "haha".getBytes(), -1); //触发NodeDataChange
byte[] data2 = zk.getData("/root", true, null);
System.out.println(new String(data2));
zk.delete("/root",-1);
}
/**
* 测试getChildren事件:-->父节点下的子增删 (delete:NodeChildrenChanged) 父节点自己的删除 (delete:NodeDelete)
*/
@Test
public void test3() throws IOException, KeeperException, InterruptedException{
ZooKeeper zk = connection();
Stat stat = zk.exists("/root", false);
if(stat==null){
zk.create("/root", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
//---------------------------------------------------------
zk.getChildren("/root", true);
zk.create("/root/children1", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
zk.getChildren("/root", true);
zk.create("/root/children2", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
zk.getChildren("/root", true);
zk.delete("/root/children1", -1);
zk.delete("/root/children2", -1);
zk.getChildren("/root", true);
zk.delete("/root", -1); /**不能级联删除,要把子节点全删掉！*/
}