How to send files between computers through 8080 port?

I'm programming an application in JAVA and I need to send one file from my computer (in which I am) to another remote computer through port 8080 (I can configure and install what I want in this remote computer if needed).
I'm thinking about using servlets and JSP but I don't know if this is the better solution and I don't know how to do it.
I guess I could install a web server (tomcat) in the remote computer and make a servlet and a JSP (with a formulary to select a file). Then from my computer I could connect to the remote website and select a file, then make a submit, the servlet would proccess the request and it'd upload the file from my computer to remote computer (in which web server is hosted). The problem is that I don't know how the servlet can get the file from my computer and upload it to the remote computer.
The idea is similar to email at Hotmail,Yahoo... when you select a file as and attachment and then it's uploaded to the server.
Well, it seems complicated and I don't know if it's the best way to do it. But the most important it's that I can only use port 8080 (due to an intermediate proxy (in my computer side) that I can't configure).
Please, help, it's very urgent.

I have a simple servlet class that should get you started.
http://www.discoverteenergy.com/files/UploadServlet.java
Here is the MultipartRequest class
http://www.discoverteenergy.com/files/MultipartRequest.java
(which was given to me by somebody and is similiar the one from oreilly that a lot of people use: http://www.servlets.com/cos/index.html
The servlet will show you how to invoke the multipart request. Its one line really:
MultipartRequest multi = new MultipartRequest(req, uploadDirectory, maxFileSize);
Hope this helps.

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                document_data              = w_doc_data
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                document_not_sent          = 2
                document_type_not_exist    = 3
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        ld_receiver = t_receivers-retrn_code.
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    regards,
    venkat

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