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Java Fast File Copy using NIO

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Java Fast File Copy using NIO

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  1. public static void fileCopy( File in, File out )
  2.             throws IOException
  3.     {
  4.         FileChannel inChannel = new FileInputStream( in ).getChannel();
  5.         FileChannel outChannel = new FileOutputStream( out ).getChannel();
  6.         try
  7.         {
  8. //          inChannel.transferTo(0, inChannel.size(), outChannel);      // original -- apparently has trouble copying large files on Windows
  9.  
  10.             // magic number for Windows, 64Mb - 32Kb)
  11.             int maxCount = (64 * 1024 * 1024) - (32 * 1024);
  12.             long size = inChannel.size();
  13.             long position = 0;
  14.             while ( position < size )
  15.             {
  16.                position += inChannel.transferTo( position, maxCount, outChannel );
  17.             }
  18.         }
  19.         finally
  20.         {
  21.             if ( inChannel != null )
  22.             {
  23.                inChannel.close();
  24.             }
  25.             if ( outChannel != null )
  26.             {
  27.                 outChannel.close();
  28.             }
  29.         }
  30.     }

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