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  1. #1
    bayan is offline Member
    Join Date
    Apr 2010
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    Exclamation Copying large files efficiently

    Is there any way to use the copy function of the operating system to copy and paste large files because I cannot think of any efficient algorithms for copying 125mb avi files. With the algorithm I have it takes around 5 minutes to copy one 125 MB file.

    If I can't use the operating system default function, can anyone tell me how to speed up the process, because buffer size seems to have no effect on the speed

    Here is the algorithm I'm using:

    Java Code:
    // Copy the file infile as another file in a different directory outfile
        private static void copy(File infile, File outfile){
            //Open a stream of bytes to read the file bytes into the program
            FileInputStream instream = new FileInputStream(infile);
            //A stream of bytes from the program to the destination
            FileOutputStream outstream = new FileOutputStream(outfile);
            byte[] buffer = new byte[4096];
            int bytesRead;
            //Write the bytes from the inputstream to the outputstream
            while((bytesRead =!=-1){
                outstream.write(buffer, 0, bytesRead);
            // Finally close both streams to save garbage disposal memory
            }catch(FileNotFoundException e){e.printStackTrace();
             catch(IOException e){e.printStackTrace();}

  2. #2
    masijade is offline Senior Member
    Join Date
    Jun 2008
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    Try FileChannel and its "copy" method.

  3. #3
    bayan is offline Member
    Join Date
    Apr 2010
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    Thanks it reduced the copy time from 5 mins 8 seconds to 13 seconds. Thanks a lot :D

    For others with the same problem here is the algorithm:

    Copying File Contents using FileChannel

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