FreeBSD Offline Package Downloader

It is a simple downloader of distfiles in ports collection on FreeBSD system, JRE is required.
you can use this application to download the distfiles of a application in the ports collection to your local disk,
the specified application and all its dependencies can be downloaded, so these files can be copied to a offline FreeBSD system using USB or any other methods
and install the application using ports collection on the offline system.
It provides a approach that can install the software on FreeBSD system if the computer does not have a direct access to internet.
It just like the tool apt-offline on debian.
have a fun!