Java api zookeeper

package com.redis.demo.zookeeper;

import java.io.Serializable;

public class User implements Serializable {
    private Integer id;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.redis.demo.zookeeper;

import org.I0Itec.zkclient.exception.ZkMarshallingError;
import org.I0Itec.zkclient.serialize.ZkSerializer;

import java.io.UnsupportedEncodingException;

public class MyZkSerializer implements ZkSerializer {

    String charset = "UTF-8";

    @Override
    public byte[] serialize(Object o) throws ZkMarshallingError {
//        return new byte[0];
        try {
            return String.valueOf(o).getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            throw new ZkMarshallingError();
        }

    }

    @Override
    public Object deserialize(byte[] bytes) throws ZkMarshallingError {
        try {
            return new String(bytes,charset);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            throw new ZkMarshallingError();
        }
    }
}

package com.redis.demo.zookeeper;

import org.I0Itec.zkclient.IZkChildListener;
import org.I0Itec.zkclient.IZkDataListener;
import org.I0Itec.zkclient.ZkClient;
import org.I0Itec.zkclient.serialize.SerializableSerializer;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.data.Stat;

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


public class ZooUtil {
    public static void main(String[] args) {
        List<String> ll = new ArrayList<String>();
        ZkClient zkClient = new ZkClient("124.220.163.230:2181", 30000, 30000);//new SerializableSerializer()
//java.lang.String cannot be cast to com.redis.demo.zookeeper.User
        //跟编码类型有关系
//        zkClient.setZkSerializer(new MyZkSerializer());
        zkClient.setZkSerializer(new SerializableSerializer());
        /**
         * 获取子目录下的数据
         */
        List<String> l = zkClient.getChildren("/");
        for (String s : l) {
            System.out.println("获取子目录下的数据=" + s);
        }

        /**
         * 创建节点，无需重复创建
         */
//        zkClient.createPersistent("/testJava1");

        /**
         * 创建子节点
         */
//        zkClient.createPersistent("/testJava1/test", true);

        /**
         * 不允许重复创建
         * org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /testJava1
         *
         */
        /**
         * 创建并设置节点的值
         */
//        zkClient.createPersistent("/testJava1", "aaaa");

        /**
         * 写数据，即更新数据，会update,不会append
         */
//        zkClient.writeData("/testJava1", "hello");

        /**
         * 写一个对象，要序列化
         * User implements Serializable
         */
//        User user = new User();
//        user.setId(1);
//        user.setName("liudehua");
//        zkClient.create("/testJava3", user, CreateMode.PERSISTENT);

        /**
         * 删除节点
         */
//        zkClient.delete("/testJava1");

        /**
         * 递归删除节点和其子节点
         */
//        zkClient.deleteRecursive("/testJava1");

        /**
         * 读取数据对象
         *
         * 测试类打印输出:
         * 获取子目录下的数据=testJava2
         * id=1
         * name=liudehua
         */
        Stat stat = new Stat();
        User u = zkClient.readData("/testJava3", stat);
        System.out.println("id=" + u.getId());
        System.out.println("name=" + u.getName());

        /**
         * 读取简单类型数据
         */
//        String s = zkClient.readData("/testJava1");
//        System.out.println("读取简单类型数据="+s);

        /**
         * 判断节点是否存在
         */
        boolean b = zkClient.exists("/testJava1");
        System.out.println("判断节点是否存在="+b);

        /**
         * 监听节点的变化，节点增加，删除，减少
         */
        zkClient.subscribeChildChanges("/testJava1", new IZkChildListener() {
            @Override
            public void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {
                System.out.println("parentPath = " + parentPath);

            }
        });
        /**
         * 监听节点数据的变化，子节点数据变化不会监听到
         */
        zkClient.subscribeDataChanges("/testJava1", new IZkDataListener() {
            //数据变化时触发

            /**
             * 模拟打印，需要间隔时间，在cli客户端没有触发??
             * handleDataChange path = /testJava1,data = one
             * handleDataChange path = /testJava1,data = two
             * handleDataChange path = /testJava1,data = three
             *
             * @param dataPath
             * @param data
             * @throws Exception
             */
            @Override
            public void handleDataChange(String dataPath, Object data) throws Exception {
                System.out.println("handleDataChange path = "+ dataPath +",data = " + data);
            }

            /**
             * 测试打印输出
             * parentPath = /testJava1
             * handleDataDeleted  path = /testJava1
             *
             * @param dataPath
             * @throws Exception
             */
            //节点删除时触发
            @Override
            public void handleDataDeleted(String dataPath) throws Exception {
                System.out.println("handleDataDeleted  path = " + dataPath);
            }
        });

        zkClient.writeData("/testJava1", "one");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        zkClient.writeData("/testJava1", "two");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        zkClient.writeData("/testJava1", "three");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        //KeeperErrorCode = Directory not empty for /testJava1
//        zkClient.delete("/testJava1");
        //需要递归删除
        zkClient.deleteRecursive("/testJava1");


        //测试监听的变化，通过线程来延时。
        try {
            Thread.sleep(1000*60*15);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

 测试发现：在java api操作变更，能监听到变化。但是在ZkClient操作，idea控制台没有反应!! watch没有变化，在ZkClient操作。