Zookeeper如何进行节点监控

<code>import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.data.Stat;
<p>public class ZooKeeperMonitor {
private static final String ZK_ADDRESS = "localhost:2181";
private static final int SESSION_TIMEOUT = 3000;
private ZooKeeper zk;</p><pre class="brush:php;toolbar:false;"><code>public void connect() throws Exception {
    zk = new ZooKeeper(ZK_ADDRESS, SESSION_TIMEOUT, new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (event.getType() == Event.EventType.NodeChildrenChanged) {
                System.out.println("节点子节点已变更: " + event.getPath());
            }
        }
    });
}

public void monitorNode(String path) throws Exception {
    Stat stat = zk.exists(path, true);
    if (stat != null) {
        System.out.println("节点存在: " + path);
    } else {
        System.out.println("节点不存在: " + path);
    }
}

public static void main(String[] args) {
    try {
        ZooKeeperMonitor monitor = new ZooKeeperMonitor();
        monitor.connect();
        monitor.monitorNode("/path/to/node");
    } catch (Exception e) {
        e.printStackTrace();
    }
}</code>

<code># 查看节点数据
get /path/to/node</p><h1>查看节点子节点</h1><p>ls /path/to/node</p>
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                <h1>监控节点变化</h1><p>get /path/to/node -w</code>

<code># 创建一个ACL
create /path/to/node "data" "world:anyone:rwcda"</p><h1>设置监控权限</h1><p>setAcl /path/to/node world:anyone:rwcda</code>