I am confuse to choose right technology for file sending?

Dear all
i am working in medical transcription project in that we have to send and receive more doc file and voice file from various client (web client and desktop client).
i have three three technology which makes me confusion
1. RMI with NIO
2.servlet with URL class in client
3.SAAJ with attachment[i dont know much about this]
so please suggest me which is the right technology for file sending and receiving...the file may maximum 20 MB

It depends if you have a valid reason to use web services. If you are providing a web front end to your application for clients to use then you could just use a standard file upload procedure, I have used apache commons and it works well for this.
If your requirements indicate that a web service call is the answer as you have some system-to-system connectivity then I think you will need to use saaj and add the file as a SOAP attachment, as embedding 20MB of binary data into a string field on a standard SOAP message will probably cause the JVM to run out of memory.
Cheers

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portion of the file and accessing data within itServlets have full access to the normal Java API, but they run on the Server, so again, as long as the file is on the server... no problem.
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I am confuse to choose right technology for file sending?

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