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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)
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创建节点