Zookeeper之Shell和API 操作

来源：互联网发布：c语言for的用法小技巧编辑：程序博客网时间：2024/06/11 12:56

Zookeeper的Shell操作:
1.连接到Zookeeper服务
[root@service zookeeper0]# bin/zkCli.sh -server localhost:2181
2.使用ls命令查看当前Zookeeper中包含的内容。
# ls /
3.创建新的znode，使用create命令
# create /zk testCRUD
4.获取节点中的值，get命令
# get /zk
5.使用set命令来对znode关联的字符串进行设置
# set /zk myData
6.删除节点
# delete /zk

Zookeeper的java API操作

public class ZooKeeperTest {
   private ZooKeeper zookeeper;

   /**
   * 连接zookeeper
   * @throws Exception
   */
   @Before
   public void setUp() throws Exception {
       String conStr = "service.bigdata.jack.cn:2181";
       int sessionTimeout = 30000;
       zookeeper = new ZooKeeper(conStr, sessionTimeout , new Watcher() {
           @Override
           public void process(WatchedEvent event) {
               System.out.println("已经触发了" + event.getType() + "事件！");
           }
       });
   }

   @Test
   public void testCRUD() throws Exception {
       // 创建一个目录节点
       zookeeper.create("/testZK", "testZKData".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
       // 创建一个子目录节点
       zookeeper.create("/testZK/childOne", "childOne".getBytes(),Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
       System.out.println(new String(zookeeper.getData("/testZK",false,null)));
       // 取出子目录节点列表
       System.out.println(zookeeper.getChildren("/testZK",true));
       // 修改子目录节点数据
       zookeeper.setData("/testZK/childOne","modifyChildDataOne".getBytes(),-1);
       System.out.println("目录节点状态：["+zookeeper.exists("/testZK",true)+"]");
       // 创建另外一个子目录节点
       zookeeper.create("/testZK/childTwo", "childTwo".getBytes(),
                      Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
       System.out.println(new String(zookeeper.getData("/testZK/childTwo",true,null)));
       // 删除子目录节点
       zookeeper.delete("/testZK/childTwo",-1);
       zookeeper.delete("/testZK/childOne",-1);
       // 删除父目录节点
       zookeeper.delete("/testZK",-1);
   }
   @After
   public void cleanUp() throws InterruptedException {
       zookeeper.close();
   }
}

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