zookeeper客户端使用第三方(zkclient)封装的Api操作节点

Posted 2021-02-13 21karat

1.引入依赖

<dependency>
      <groupId>com.101tec</groupId>
      <artifactId>zkclient</artifactId>
      <version>0.10</version>
</dependency>

 2.会话连接

 1 package com.karat.cn.zookeeper.zkclient;
 2 
 3 import org.I0Itec.zkclient.ZkClient;
 4 /**
 5  * 创建会话(连接zookeeper)
 6  * @author 开发
 7  *
 8  */
 9 public class SessionDemo {
10 
11      private final static String CONNECTSTRING="47.107.121.215:2181";
12 
13      public static void main(String[] args) {
14           ZkClient zkClient=new ZkClient(CONNECTSTRING,4000);
15           System.out.println(zkClient+" - > success连接");  
16      }
17 }

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3.节点简单操作

 1 package com.karat.cn.zookeeper.zkclient;
 2 
 3 import java.util.List;
 4 import java.util.concurrent.TimeUnit;
 5 
 6 import org.I0Itec.zkclient.IZkChildListener;
 7 import org.I0Itec.zkclient.IZkDataListener;
 8 import org.I0Itec.zkclient.ZkClient;
 9 /**
10  * 节点操作
11  * @author Administrator
12  *
13  */
14 public class ZkClientApiOperatorDemo {
15     
16     private final static String CONNECTSTRING="47.107.121.215:2181";
17 
18     private static ZkClient getInstance(){
19         return new ZkClient(CONNECTSTRING,10000);//10000是连接超时时间
20     }
21 
22     public static void main(String[] args) throws InterruptedException {
23         ZkClient zkClient=getInstance();//连接
24         //zkClient.createEphemeral("/zkClient");//创建临时节点
25         //zkClient中提供递归创建父节点的功能
26         //zkClient.createPersistent("/zkClient/a/b/c/d",true);//创建持久化节点
27         //删除节点
28         //zkClient.delete("/zkClient");
29         //递归删除节点
30         //zkClient.deleteRecursive("/zkClient");
31         //获取子节点
32         List<String> list=zkClient.getChildren("/zkClient/a");
33         System.out.println(list);
34         
35         
36         //watcher(订阅获取)
37         zkClient.subscribeDataChanges("/node", new IZkDataListener() {
38             
39             @Override
40             public void handleDataDeleted(String dataPath) throws Exception {
41                 // TODO Auto-generated method stub
42                 
43             }
44             
45             @Override
46             public void handleDataChange(String dataPath, Object data) throws Exception {
47                 // TODO Auto-generated method stub
48                 System.out.println("节点名称："+dataPath+"->节点修改后的值"+data);
49             }
50         });
51         
52         zkClient.writeData("/node", "123");//修改节点的数据 
53         TimeUnit.SECONDS.sleep(2);//上述事件是异步的，需要睡两秒
54         
55         zkClient.subscribeChildChanges("/node", new IZkChildListener() {
56             
57             @Override
58             public void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {
59                 // TODO Auto-generated method stub
60                 
61             }
62         });
63     }
64 }

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