zookeeper添加操作
时间: 2023-09-01 10:13:08 浏览: 67
Zookeeper的添加操作包括创建节点、设置节点数据以及创建子节点等。具体步骤如下:
1. 创建节点:使用create()方法创建一个新的ZNode节点。例如:create /path data
2. 设置节点数据:使用setData()方法设置节点数据。例如:setData /path newdata
3. 创建子节点:使用create()方法创建一个新的子节点。例如:create /parent/child data
注意,以上操作都需要先连接到Zookeeper服务端,参考代码如下:
```
import org.apache.zookeeper.*;
public class ZookeeperDemo {
private static final int SESSION_TIMEOUT = 5000;
private ZooKeeper zk;
private CountDownLatch connectedSignal = new CountDownLatch(1);
public void connect(String hosts) throws IOException, InterruptedException {
zk = new ZooKeeper(hosts, SESSION_TIMEOUT, new Watcher() {
public void process(WatchedEvent event) {
if (event.getState() == Event.KeeperState.SyncConnected) {
connectedSignal.countDown();
}
}
});
connectedSignal.await();
}
public void close() throws InterruptedException {
zk.close();
}
public Stat exists(String path, boolean watch) throws KeeperException, InterruptedException {
return zk.exists(path, watch);
}
public String create(String path, byte[] data) throws KeeperException, InterruptedException {
return zk.create(path, data, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
public void setData(String path, byte[] data) throws KeeperException, InterruptedException {
zk.setData(path, data, -1);
}
public void delete(String path) throws KeeperException, InterruptedException {
zk.delete(path, -1);
}
public List<String> getChildren(String path, boolean watch) throws KeeperException, InterruptedException {
return zk.getChildren(path, watch);
}
public byte[] getData(String path, boolean watch, Stat stat) throws KeeperException, InterruptedException {
return zk.getData(path, watch, stat);
}
public static void main(String[] args) throws Exception {
ZookeeperDemo demo = new ZookeeperDemo();
demo.connect("localhost:2181");
// 创建节点
demo.create("/path", "data".getBytes());
// 设置节点数据
demo.setData("/path", "newdata".getBytes());
// 创建子节点
demo.create("/parent/child", "data".getBytes());
demo.close();
}
}
```