开发一个类似QQ的聊天软件，软件分为服务器端和客户端两部分。客户和服务器、客户和客户采用UDP协议通信。

软件实现以下功能：

㈠基本功能

①用户通过客户端向服务器注册，成为聊天用户。服务器端保存用户的信息。

②用户登录后通过客户端可以查询服务器端的注册用户，并加其为好友。

③用户可以与好友进行文字聊天。-Develop a similar QQ chat software, the software is divided into two parts, the server and client. Client and server, customers and clients using UDP communication.

The software implements the following functions:

(I) basic functions

(1) User registered by the client to the server, chat users. The server-side to save the user s information.

② users log in through the client can query the registered user of the server-side, and add as friend.