Zookeeper示例代码详解

以下是Zookeeper的示例代码，展示了如何进行基本操作。请仔细阅读代码注释，以理解每个步骤的作用和实现方式。示例代码如下：

import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.WatchedEvent;

public class ZookeeperExample {
    private static ZooKeeper zk;
    private static ZookeeperConnection conn;

    public static void main(String[] args) throws Exception {
        conn = new ZookeeperConnection();
        zk = conn.connect("localhost");

        Watcher watcher = new Watcher() {
            public void process(WatchedEvent we) {
                if (we.getState() == Watcher.Event.KeeperState.SyncConnected) {
                    System.out.println("Zookeeper connection established");
                }
            }
        };

        zk.exists("/example", watcher);

        conn.close();
    }
}

class ZookeeperConnection {
    public ZooKeeper connect(String host) throws Exception {
        zk = new ZooKeeper(host, 5000, null);
        return zk;
    }

    public void close() throws Exception {
        zk.close();
    }
}

上述代码展示了如何连接到Zookeeper服务器并设置一个Watcher来监听节点的变化。