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Creating threaded downloader project

I am doing a project in Java called "Threaded Downloader." I've created five connections to the destination file, but I cannot retrieve an arbitrary part on the file. I need to download each part of the file in each thread to increase the downloading speed. Please tell me a way to make it happen.
If you are downloading from one machine to another, regardless of protocol, you can split the files up into five different segments based on byte offsets and then use the java.io.RandomAccessFile class. If you are dealing with multipart byte streams over HTTP, you will need to be a bit trickier. See the commons.fileupload package in the Jakarta project at: http://jakarta.apache.org/commons/fileupload/

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