资 源 简 介
1) 采用套接字方式建立FTP服务器和客户端；
2) 服务器端既可接收客户端上传的文件，又可发送文件至客户端；
3) 客户端既可下载服务器中的文件，又可上传文件至服务器；
-1) using a socket approach to building FTP server and the client 2) server-side clients can receive uploaded files, but also send the file to the client 3) the client can download the file server, but also upload files to the server
