一个很好的FTP客户端实例，实现了上载、下载文件，更改服务器目录等功能，界面也与市面上比较流行的CuteFtp和LeapFtp相似。-a good FTP client example, the realization of uploading, downloading documents, such as changes in directory server functions, interface with the market more popular CuteFtp and LeapF