强烈建议对zk使用一些层，比如apachecurator或zkclient。下面是一个例子

CuratorFramework zkClient = CuratorFrameworkFactory.builder().connectString("localhost:2181").build();
zkClient.start();
boolean isExist = zkClient.checkExists().forPath("/myNode") != null;
if (isExist) {
    byte[] myNodeBytes = zkClient.getData().forPath("/myNode");
    if (myNodeBytes != null && myNodeBytes.length > 0) {
        System.out.println(new String(myNodeBytes));
    }
}
else {
    zkClient.create().withMode(CreateMode.PERSISTENT).forPath("/myNode", "foo".getBytes());
}