How to copy a file to a server

[SunkenHeights]

Hi guys.
I have two problems. I am new to Java Programming so I do not really have a clear idea on the following:
- How to copy a file to a desired location which happens to be a server?
- How to make sure that the file the user enters is only a text file?

Any suggesstions or help is welcome

Thanks

[Dököll]

I am sure you are long gone by now, just thumbing through unanswered ones and adding what could be helpful for future use:How to copy a text file to a server using Java - Google Search