package com.chen;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.ZooDefs.Ids;
public class ZkWatcher implements Watcher{
/**
* 集羣鏈接地址
*/
private static final String CONNECT_ADDR = "192.168.1.104:2181,192.168.1.105:2181,192.168.1.106:2181";
/**
* session超時時間
*/
private static final int SESSION_OUTTIME = 2000;
private static ZooKeeper zooKeeper = null;
public ZkWatcher() {
this.createConnection(CONNECT_ADDR, SESSION_OUTTIME);
}
public void process(WatchedEvent watchedEvent) {
//zk節點變更,添加,刪除,修改時間監聽
KeeperState keeperState = watchedEvent.getState();
//事件類型
EventType eventType = watchedEvent.getType();
//節點名稱
String path = watchedEvent.getPath();
if(KeeperState.SyncConnected == keeperState){
//連接類型
if(EventType.None == eventType){
//建立連接
System.out.println("建立zk連接成功");
}
//創建類型
if(EventType.NodeCreated == eventType){
System.out.println("####事件通知,當前創建一個新的節點####路徑:" + path);
}
//修改類型
if(EventType.NodeDataChanged == eventType){
System.out.println("####事件通知,當前創建一個修改節點####路徑:" + path);
}
//刪除類型
if(EventType.NodeDeleted == eventType){
System.out.println("####事件通知,當前創建一個刪除節點####路徑:" + path);
}
}
}
//創建鏈接
public void createConnection(String address,int sessionTimeout){
try {
zooKeeper = new ZooKeeper(address,sessionTimeout,this);
} catch (Exception e) {
// TODO: handle exception
}
}
//創建節點
public void createNode(String path,String data){
try {
String result = zooKeeper.create(path, data.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println("創建節點成功......result:"+result);
} catch (Exception e) {
e.printStackTrace();
}
}
//修改節點
public void updateNode(String path,String data){
try {
zooKeeper.setData(path, data.getBytes(), -1);
} catch (Exception e) {
e.printStackTrace();
}
}
//刪除節點
public void deleteNode(String path){
try {
zooKeeper.delete(path, -1);
} catch (Exception e) {
e.printStackTrace();
}
}
//關閉
public void close(){
try {
if(zooKeeper != null){
zooKeeper.close();
}
} catch (Exception e) {
}
}
public static void main(String[] args) throws KeeperException, InterruptedException {
ZkWatcher zkWatcher = new ZkWatcher();
String path = "/parent1";
//設置實時監聽path
zooKeeper.exists(path, true);
// zkWatcher.createNode(path, "123456");
// zkWatcher.updateNode(path, "9999");
zkWatcher.deleteNode(path);
zkWatcher.close();
}
}
package com.chen;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
public class zookeeperDemo {
/**
* 集羣鏈接地址
*/
private static final String CONNECT_ADDR = "192.168.1.104:2181,192.168.1.105:2181,192.168.1.106:2181";
/**
* session超時時間
*/
private static final int SESSION_OUTTIME = 2000;
/**
* 信號量,阻塞程序執行,用戶等待zookeeper鏈接成功,發送成功信號
*/
private static final CountDownLatch countDownLatch = new CountDownLatch(1);
public static void main(String[] args) throws InterruptedException, KeeperException {
try {
ZooKeeper zooKeeper = new ZooKeeper(CONNECT_ADDR, SESSION_OUTTIME, new Watcher(){
public void process(WatchedEvent watchedEvent) {
//獲取時間的狀態
KeeperState keeperState = watchedEvent.getState();
EventType eventType = watchedEvent.getType();
//如果建立連接
if(keeperState.SyncConnected == keeperState){
if(EventType.None == eventType){
//如果建立鏈接,則發送信號量,讓後阻塞程序向下執行
countDownLatch.countDown();
System.out.println("zk,建立連接");
}
}
}
});
//進行阻塞
countDownLatch.await();
//創建父節點
// String result = zooKeeper.create("/testRott", "12245465".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
// System.out.println("result:" + result);
//創建子節點
String result = zooKeeper.create("/testRott/children", "children 12245465".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println("result:"+result);
zooKeeper.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
這些都是zookeeper最基本的東西,沒什麼好說的,僅僅只是做個筆記。