ZooKeeper API修改节点值

package com.yqq.zookeeper.curd;

import org.apache.log4j.Logger;
import org.apache.zookeeper.*;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;

/**
 * @Author yqq
 * @Date 2021/10/24 00:25
 * @Version 1.0
 */
public class ZKCurd {
    //定义会话的超时时间
    private final static int SESSION_TIME = 30000;
    //定义zk集群的ip地址
    private final static String ZK_SERVERS = "192.168.134.102:2181,192.168.134.103:2181,192.168.134.104:2181";
    //日志对象
    private final static Logger LOGGER = Logger.getLogger(ZKCurd.class);
    private ZooKeeper zooKeeper = null;
    private Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent watchedEvent) {
            LOGGER.info("event:"+watchedEvent.toString());
        }
    };
    @Before
    public void connect() throws IOException {
        zooKeeper = new ZooKeeper(ZK_SERVERS,SESSION_TIME,watcher);
        //获取当前的会话sessionID
        Long sessionId = zooKeeper.getSessionId();
        LOGGER.info("sessionId:"+sessionId);
        System.out.println("zookeeper:"+zooKeeper);
    }
    @After
    public void close() throws InterruptedException {
        zooKeeper.close();
    }
    /**
     * 创建节点
     * final String path:要创建的节点的全路径
     * byte data[]:节点中数据内容
     * List<ACL> acl:节点权限
     * CreateModel createModel:节点类型
     * *PERSISTENT:普通持久节点
     * *PERSISTENT_SEQUENTIAL:普通临时持久节点
     * *EPHEMERAL:普通临时节点
     * *EPHEMERAL_SEQUENTIAL:普通临时有序节点
     */
    @Test
    public void create() {
        String result = null;
        try {
//            result = zooKeeper.create("/James","good nice".getBytes(StandardCharsets.UTF_8),
//                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            result = zooKeeper.create("/JamesLLL","good nice".getBytes(StandardCharsets.UTF_8),
                    ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
            Assert.fail();
        }
        LOGGER.info("create result:{"+result+"}");
    }
    @Test
    public void exist(){
        try {
            Stat stat = zooKeeper.exists("/zhangsan",false);
            if(stat==null)
                LOGGER.error("/zhangsan not exits");
            else
                LOGGER.info("/zhangsan exits");
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
        }
    }
    @Test
    public void getData(){
        String result = null;
        try {
            byte[] data = zooKeeper.getData("/James",null,null);
            result = new String(data);
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
        }
        LOGGER.info("getData result :"+result);
    }
    @Test
    public void getChildren(){
        try {
            List<String> childrenList = zooKeeper.getChildren("/",true);
            childrenList.forEach(e -> {
                LOGGER.info("child :"+e);
            });
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
        }
    }
    @Test
    public void getChildrenData(){
        try {
            List<String> childrenList = zooKeeper.getChildren("/",true);
            childrenList.forEach(e -> {
                try {
                    byte[] datas = zooKeeper.getData("/"+e,null,null);
                    String data = new String(datas);
                    LOGGER.info("getChildData :"+data);
                } catch (Exception e1) {
                    LOGGER.error(e1.getMessage());
                }
                LOGGER.info("child :"+e);
            });
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
        }
    }
    @Test
    public void setData(){
        Stat stat = null;
        try {
            //-1 表示不管version的值为几都能修改
            stat = zooKeeper.setData("/James","詹姆斯".getBytes(StandardCharsets.UTF_8),-1);
        } catch (Exception e) {
            LOGGER.error(e.getMessage());
        }
        //dataVersion:getVersion获取的节点值的版本，每被修改一次，该值加1
        LOGGER.info("version:{"+stat.getVersion()+"}");
    }
}

[zk: localhost:2181(CONNECTED) 8] get -s /James
good nice
cZxid = 0x200000035
ctime = Sun Oct 24 01:25:57 CST 2021
mZxid = 0x200000035
mtime = Sun Oct 24 01:25:57 CST 2021
pZxid = 0x300000007
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 9
numChildren = 1
[zk: localhost:2181(CONNECTED) 9] get -s /James
詹姆斯
cZxid = 0x200000035
ctime = Sun Oct 24 01:25:57 CST 2021
mZxid = 0x300000011
mtime = Sun Oct 24 11:55:27 CST 2021
pZxid = 0x300000007
cversion = 1
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 9
numChildren = 1

2021-10-24 11:55:25,690 INFO [com.yqq.zookeeper.curd.ZKCurd] - version:{1}