前幾篇文章介紹了Zookeeper的安裝，今天來看看怎樣通過Zookeeper的API來操作Zookeeper。

下面看看具體程式碼實現

package my.zookeeperstudy;
 
import org.apache.zookeeper.*;
 
import java.util.List;
 
public class Test {
    private static final String HOST = "<hostname>";
    private static final String PORT = "2181";
 
    public static void main(String[] args) throws Exception {
        ZooKeeper zk = new ZooKeeper(HOST + ":" + PORT, 10000,
                new Watcher() {
                    public void process(WatchedEvent event) {
                        System.out.println("event: " + event.getType());
                    }
                });
 
        System.out.println(zk.getState());
 
        zk.create("/myApps", "myAppsData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App1", "App1Data".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App2", "App2Data".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App3", "".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.setData("/myApps/App3","App3Data".getBytes(), -1);
 
        System.out.println(zk.exists("/myApps", true));
        System.out.println(new String(zk.getData("/myApps", true, null)));
 
        List<String> children = zk.getChildren("/myApps", true);
        for (String child : children) {
            System.out.println(new String(zk.getData("/myApps/" + child, true, null)));
            zk.delete("/myApps/" + child,-1);
        }
 
        zk.delete("/myApps",-1);
 
        zk.close();
    }
}