基于Zookeeper Java API实现服务注册与发现的功能，实现了服务的注册功能、服务上线自动注册到zookeeper、服务离线自动从zookeeper中移除、服务动态发现功能：服务上线自动拉取zookeeper中已经注册的服务信息。有新的服务注册到zookeeper，自动拉取更新本地注册表，有服务离线自动删除本地注册表中该服务的信息、Zookeeper客户端session过期重连等功能。
Service Register and Discover with EtcD in Golang (embed with smooth weighted round robin)
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