引入依赖

<dependencies>
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.5.7</version>
    </dependency>
<dependencies>

创建ZooKeeper客户端

public class zkClient {

    // 注意：逗号左右不能有空格
    private String connectString = "hadoop102:2181,hadoop103:2181,hadoop104:2181";
    private int sessionTimeout = 2000;
    private ZooKeeper zkClient;

    @Before
    public void init() throws IOException {

        zkClient = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
            @Override
            public void process(WatchedEvent watchedEvent) {

                System.out.println("-------------------------------");
                List<String> children = null;
                try {
                    children = zkClient.getChildren("/", true);

                    for (String child : children) {
                        System.out.println(child);
                    }

                    System.out.println("-------------------------------");
                } catch (KeeperException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

创建子节点

@Test
public void create() throws KeeperException, InterruptedException {
    // 参数1：要创建的节点的路径； 参数2：节点数据 ； 参数3：节点权限 ；参数4：节点的类型
    String nodeCreated = zkClient.create("/czs", "czshh".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}

获取子节点并监听节点变化

@Test
public void getChildren() throws KeeperException, InterruptedException {
    List<String> children = zkClient.getChildren("/", true);

    for (String child : children) {
        System.out.println(child);
    }

    // 延时
    Thread.sleep(Long.MAX_VALUE);
}

判断Znode是否存在

@Test
public void exist() throws KeeperException, InterruptedException {

    Stat stat = zkClient.exists("/czs", false);

    System.out.println(stat==null? "not exist " : "exist");
}