说明：  这是一个简单的联网信息服务代码，向服务器传送信息并获取服务器响应信息。其实这种代码也适用于聊天程序设计，向服务器发送信息，获取对方经服务器传来的信息。
(This is a simple code of networked information services, information transmitted to the server and access information in response to the server. In fact, this code also applies to chat program design, information sent to the server, access to each other via the information from the server.)