遵循ftp协议，实现远程文件的上传、下载、查看以及远程目录的创建和删除。
Follow the FTP protocol, implementation of remote file upload, download, view and remote directory to create and delete.
遵循ftp协议，实现远程文件的上传、下载、查看以及远程目录的创建和删除。
Follow the FTP protocol, implementation of remote file upload, download, view and remote directory to create and delete.
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