今天在做dubbo實驗的時候，碰到一個問題，卡了我7-8小時，差了很多資料無果，錯誤如下

2016-10-09 02:23:27,292 INFO [org.apache.zookeeper.ZooKeeper] - Initiating client connection, connectString=1.1.1.2:2181 sessionTimeout=60000 [email protected]
2016-10-09 02:23:27,307 INFO [org.I0Itec.zkclient.ZkClient] - Waiting for keeper state SyncConnected
2016-10-09 02:23:32,308 INFO [org.I0Itec.zkclient.ZkEventThread] - Terminate ZkClient event thread.
2016-10-09 02:23:36,665 INFO [org.apache.zookeeper.ClientCnxn] - Opening socket connection to server 1.1.1.2/1.1.1.2:2181. Will not attempt to authenticate using SASL (unknown error)
2016-10-09 02:23:36,667 INFO [org.apache.zookeeper.ClientCnxn] - Socket connection established to 1.1.1.2/1.1.1.2:2181, initiating session
2016-10-09 02:23:36,690 INFO [org.apache.zookeeper.ClientCnxn] - Session establishment complete on server 1.1.1.2/1.1.1.2:2181, sessionid = 0x57a5203af30018, negotiated timeout = 40000
2016-10-09 02:23:36,699 INFO [org.apache.zookeeper.ZooKeeper] - Session: 0x57a5203af30018 closed
2016-10-09 02:23:36,702 INFO [org.apache.zookeeper.ClientCnxn] - EventThread shut down
2016-10-09 02:23:36,703 WARN [org.springframework.context.support.ClassPathXmlApplicationContext] - Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sysUserService' defined in file [D:\linux_shared\myjavaproject\system_interchange\bhz-sys-service\target\classes\bhz\sys\service\SysUserService.class]: Initialization of bean failed; nested exception is org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)

最後發現是嘗試，在我自己程式執行端（也就是java程式跑的所在機器，我自己的膝上型電腦上，加入了zk伺服器的ip和伺服器名對映關係，沒想到竟然解決了，我只能說操蛋啊，查了幾個小時，因為是spring或者是程式配置問題，主要引起我注意的是Will not attempt to authenticate using SASL (unknown error)那句。。。）

1.這裡1.1.1.2是zk的伺服器端IP地址，我在伺服器上也配置了1.1.1.2和伺服器本機的IP地址對映關係，不然也可以出問題

2.在  C:\Windows\System32\drivers\etc\hosts 里加入 1.1.1.2  ubuntu16這句話，問題就解決了。。。

3.補充一下，發現zk伺服器端不配置對映關係似乎也可以用，但是zk客戶端，是一定要配置的