FTP客户端，实现的功能不是太多，但是实现了连接了服务器，进行上传和下载，源码比较简单易于初学者的学习。可以在此基础上进行丰富-FTP client to achieve the function is not too much, but realized the connection of the server to upload and download, simple easy-to source for beginners to learn. On this basis can be a