【自撰】zooKeeper 集成 Java代码

导入maven依赖

     org.apache.zookeeper
     zookeeper
     3.6.0

java代码

try {
    // 计数器对象
    CountDownLatch countDownLatch = new CountDownLatch(1);
    // ip地址, 超时时间ms ，监听器
    ZooKeeper zooKeeper = new ZooKeeper("192.168.17.113:2181", 5000, new Watcher() {
        @Override
        public void process(WatchedEvent watchedEvent) {
            // 判断
            if (watchedEvent.getState() == Event.KeeperState.SyncConnected) {
                System.out.println("连接成功");
                // 计数器-1
                countDownLatch.countDown();
            }
        }
    });
    // 阻塞主进程
    countDownLatch.await();
    // 创建节点  /path ，数据的字节数组 ， ZooDefs.Ids.权限 , CreateMode.节点的类型
    // 持久化节点
    zooKeeper.create("/z1","zzz".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
    // 获取数据
    byte[] data = zooKeeper.getData("/z1", null, new Stat());
    System.out.println(new String(data));
   

    // 关闭zookeeper
    zooKeeper.close();
} catch (IOException | InterruptedException | KeeperException e) {
    e.printStackTrace();
}

可以自行封装，提高性能

复制三份zookeeper的tar包解压，分别将文件夹重命名为

mv  apache -zookeeper-3.7.0-bin zookeeper2181
mv  apache -zookeeper-3.7.0-bin zookeeper2182
mv  apache -zookeeper-3.7.0-bin zookeeper2183

进入任意zookeeper文件夹
创建data文件夹 进入data新建myid文件 sehll echo “1” > myid
进入conf文件夹 复制

cp zoo_sample.cfg zoo.cfg

修改zoo.cfg文件

vi zoo.cfg

dataDir = (data文件夹的路径)
clientPort=(端口号)
最后在zoo.cfg末尾添加

其他文件 重复以上操作即可

1. 启动以上zookeeper ./zkServer.sh
2. 查看启动的状态 ./zkServer.sh status
   
   Mode: follower(从机)、leader(主机)
3. 切换端口连接 ./zkCli.sh -server ip:端口

以上操作即可完成zookeeper集群