定义并实例化一个Client线程类，一个就对应一个客户连接,实例化一个ChatServer类-And examples of the definition of a Client-thread categories, corresponding to a client on a connection, examples of a category ChatServer

定义并实例化一个Client线程类，一个就对应一个客户连接,ChatServer类的构造器用来初始化一些UI信息-Definition and examples of a type of Client thread that a connection on the corresponding client, ChatServer class constructor to initialize some UI information