ZooKeeper 集群 Java API 使用

具体代码实现

/**
*增删改查
*@author Lv_Hulk
*/
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.apache.ZooKeeper.CreateMode;
import org.apache.ZooKeeper.ZooDefs.Ids;
import org.apache.ZooKeeper.ZooKeeper;
import org.apache.ZooKeeper.data.ACL;
import org.apache.ZooKeeper.data.Stat;
public class ZooKeeperDemo {
// 客户端去请求链接的时候的服务器链接地址信息
private static String connectString = "hadoop02:2181,hadoop03:2181,hadoop04:2181";
// 客户端去请求链接的超时时长
private static int sessionTimeout = 4000;
// 节点名称，统一命名
private static String znode = "/zk/huangbo1";
public static void main(String[] args) throws Exception {
// 拿 ZooKeeper 链接
ZooKeeper zk = new ZooKeeper(connectString, sessionTimeout, null);
// 创建 znode
String createdNode = zk.create(znode, "huangbo".getBytes(), Ids.OPEN_ACL_UNSAFE, 
CreateMode.PERSISTENT);
System.out.println(createdNode+"节点创建成功");
// 查看节点
byte[] data = zk.getData(znode, null, null);
System.out.println(new String(data));
// 修改节点数据
Stat setData = zk.setData(znode, "huangbo-xifu".getBytes(), -1);
System.out.println(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new 
Date(setData.getMtime())));
byte[] data1 = zk.getData(znode, null, null);
System.out.println(new String(data1));
// 获取 znode 的权限信息
List<ACL> aclList = zk.getACL(znode, null);
for(ACL acl: aclList){
System.out.println(acl.getPerms());
}
// 判断节点是否存在
Stat exists = zk.exists(znode, null);
System.out.println(null != exists?true:false);
// 获取子节点
List<String> children = zk.getChildren("/", null);
for(String child: children){
System.out.println(child);
}
// 删除节点
zk.delete(znode, -1);
Stat exists1 = zk.exists(znode, null);
System.out.println(null == exists1?"删除成功":"删除失败");
zk.close();
}
}