Java实现与ZooKeeper的连接
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Java实现
新建一个类实现接口Watcher. 是指:
This interface specifies the public interface an event handler class must implement. A ZooKeeper client will get various events from the ZooKeepr server it connects to. An application using such a client handles these events by registering a callback object with the client. The callback object is expected to be an instance of a class that implements Watcher interface.
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- package com.zoo.demo;
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- import java.io.IOException;
- import java.util.concurrent.CountDownLatch;
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- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.zookeeper.WatchedEvent;
- import org.apache.zookeeper.Watcher;
- import org.apache.zookeeper.ZooKeeper;
- import org.apache.zookeeper.Watcher.Event.KeeperState;
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- public class AbstractZooKeeper implements Watcher {
- private static Log log = LogFactory.getLog(AbstractZooKeeper.class.getName());
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- private static final int SESSION_TIME = 2000;
- protected ZooKeeper zooKeeper;
- protected CountDownLatch countDownLatch=new CountDownLatch(1);
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- public void connect(String hosts) throws IOException, InterruptedException{
- zooKeeper = new ZooKeeper(hosts,SESSION_TIME,this);
- countDownLatch.await();
- }
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- @Override
- public void process(WatchedEvent event) {
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- if(event.getState()==KeeperState.SyncConnected){
- countDownLatch.countDown();
- }
- }
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- public void close() throws InterruptedException{
- zooKeeper.close();
- }
- }
然后写一些操作和main方法
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- package com.zoo.demo;
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- import java.util.Arrays;
- import java.util.List;
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- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.zookeeper.CreateMode;
- import org.apache.zookeeper.KeeperException;
- import org.apache.zookeeper.ZooDefs.Ids;
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- public class ZooKeeperOperator extends AbstractZooKeeper {
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- private static Log log = LogFactory.getLog(ZooKeeperOperator.class.getName());
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- public void create(String path,byte[] data)throws KeeperException, InterruptedException{
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- this.zooKeeper.create(path, data, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
- }
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- public void getChild(String path) throws KeeperException, InterruptedException{
- try{
- List<String> list=this.zooKeeper.getChildren(path, false);
- if(list.isEmpty()){
- log.debug(path+"中没有节点");
- }else{
- log.debug(path+"中存在节点");
- for(String child:list){
- log.debug("节点为:"+child);
- }
- }
- }catch (KeeperException.NoNodeException e) {
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- throw e;
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- }
- }
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- public byte[] getData(String path) throws KeeperException, InterruptedException {
- return this.zooKeeper.getData(path, false,null);
- }
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- public static void main(String[] args) {
- try {
- ZooKeeperOperator zkoperator = new ZooKeeperOperator();
- zkoperator.connect("192.168.0.138");
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- byte[] data = new byte[]{'a','b','c','d'};
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- String zktest="ZooKeeper的Java API测试";
- zkoperator.create("/root/child3", zktest.getBytes());
- log.debug("获取设置的信息:"+new String(zkoperator.getData("/root/child3")));
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- System.out.println("节点孩子信息:");
- zkoperator.getChild("/root");
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- zkoperator.close();
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- } catch (Exception e) {
- e.printStackTrace();
- }
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- }
- }
最后运行结果:
- 2013-01-16 15:26:04:INFO org.apache.zookeeper.ZooKeeper - Client environment:user.name=Administrator
- 2013-01-16 15:26:04:INFO org.apache.zookeeper.ZooKeeper - Client environment:user.home=C:\Documents and Settings\Administrator
- 2013-01-16 15:26:04:INFO org.apache.zookeeper.ZooKeeper - Client environment:user.dir=D:\workspace\stormdemo1
- 2013-01-16 15:26:04:INFO org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=192.168.0.138 sessionTimeout=2000 watcher=com.zoo.demo.ZooKeeperOperator@ca8327
- 2013-01-16 15:26:04:INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server /192.168.0.138:2181
- 2013-01-16 15:26:13:INFO org.apache.zookeeper.ClientCnxn - Socket connection established to 192.168.0.138/192.168.0.138:2181, initiating session
- 2013-01-16 15:26:13:INFO org.apache.zookeeper.ClientCnxn - Session establishment complete on server 192.168.0.138/192.168.0.138:2181, sessionid = 0x13c3c5224cc0003, negotiated timeout = 4000
- 2013-01-16 15:26:13:DEBUG com.zoo.demo.ZooKeeperOperator - 获取设置的信息:ZooKeeper的Java API测试
- 节点孩子信息:
- 2013-01-16 15:26:13:DEBUG com.zoo.demo.ZooKeeperOperator - /root中存在节点
- 2013-01-16 15:26:13:DEBUG com.zoo.demo.ZooKeeperOperator - 节点为:child1
- 2013-01-16 15:26:13:DEBUG com.zoo.demo.ZooKeeperOperator - 节点为:child3
- 2013-01-16 15:26:13:DEBUG com.zoo.demo.ZooKeeperOperator - 节点为:child2
- 2013-01-16 15:26:13:INFO org.apache.zookeeper.ZooKeeper - Session: 0x13c3c5224cc0003 closed
- 2013-01-16 15:26:13:INFO org.apache.zookeeper.ClientCnxn - EventThread shut down
针对出现的中文乱码看采用下面的处理即可:
- String zktest="ZooKeeper的Java API测试";
- zkoperator.create("/root/child5", zktest.getBytes("utf-8"));
- log.debug("获取设置的信息:"+new String(zkoperator.getData("/root/child5"),"utf-8"));
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