四．Zookeeper之JAVA API

1. 创建会话

   客户端可以通过创建一个ZooKeeper实例来连接ZooKeeper服务器，Zookeeper的四种构造方法如下：

new ZooKeeper(connectString, sessionTimeout, watcher)

        new ZooKeeper(connectString, sessionTimeout, watcher, canBeReadOnly)

        new ZooKeeper(connectString, sessionTimeout, watcher, sessionId, sessionPasswd)

        new ZooKeeper(connectString, sessionTimeout, watcher, sessionId, sessionPasswd, canBeReadOnly)

    

 

1. 创建节点