Zookeeper 入门学习之zclient简单使用案例

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ZkClient使用案例

一、ZkClient 入门案例demo代码

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.I0Itec.zkclient.ZkClient;
import org.I0Itec.zkclient.ZkConnection;

public class ZkClientBase {

	/** zookeeper地址 */
	static final String CONNECT_ADDR = "192.168.91.101:2181,192.168.91.102:2181,192.168.91.103:2181";
	/** session超时时间 */
	static final int SESSION_OUTTIME = 5000;//ms 

	public static void main(String[] args) throws Exception {
		ZkClient zkc = new ZkClient(new ZkConnection(CONNECT_ADDR), 5000);
		//1. create and delete方法 
		zkc.createEphemeral("/temp");
		zkc.createPersistent("/super/c1", true);
		Thread.sleep(10000);
		zkc.delete("/temp");
		zkc.deleteRecursive("/super");
		
		//2. 设置path和data 并且读取子节点和每个节点的内容
//		zkc.createPersistent("/super", "1234");
//		zkc.createPersistent("/super/c1", "c1内容");
//		zkc.createPersistent("/super/c2", "c2内容");
//		List<String> list = zkc.getChildren("/super");
//		for(String p : list){
//			System.out.println(p);
//			String rp = "/super/" + p;
//			String data = zkc.readData(rp);
//			System.out.println("节点为：" + rp + "，内容为: " + data);
//		}
		
		//3. 更新和判断节点是否存在
//		zkc.writeData("/super/c1", "新内容");
//		System.out.println(zkc.readData("/super/c1"));
//		System.out.println(zkc.exists("/super/c1"));
		
		//4.递归删除/super内容
//		zkc.deleteRecursive("/super");		
	}
}

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zkClientListener的使用demo

import java.util.List;

import org.I0Itec.zkclient.IZkChildListener;
import org.I0Itec.zkclient.ZkClient;
import org.I0Itec.zkclient.ZkConnection;

public class ZkClientWatcher1 {

	/** zookeeper地址 */
	static final String CONNECT_ADDR = "192.168.91.101:2181,192.168.91.102:2181,192.168.91.103:2181";
	/** session超时时间 */
	static final int SESSION_OUTTIME = 5000;//ms 
	
	
	public static void main(String[] args) throws Exception {
		ZkClient zkc = new ZkClient(new ZkConnection(CONNECT_ADDR), 5000);
		
		//对父节点添加监听子节点变化。
		zkc.subscribeChildChanges("/super", new IZkChildListener() {
			@Override
			public void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {
				System.out.println("parentPath: " + parentPath);
				System.out.println("currentChilds: " + currentChilds);
			}
		});
		
		Thread.sleep(3000);
		
		zkc.createPersistent("/super");
		Thread.sleep(1000);
		
		zkc.createPersistent("/super" + "/" + "c1", "c1内容");
		Thread.sleep(1000);
		
		zkc.createPersistent("/super" + "/" + "c2", "c2内容");
		Thread.sleep(1000);		
		
		zkc.delete("/super/c2");
		Thread.sleep(1000);	
		
		zkc.deleteRecursive("/super");
		Thread.sleep(Integer.MAX_VALUE);
	}
}

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参考

• 白老师视频教程