public static void createTestFiles() { try { System.out.println("Creating test files ... "); Random rand = new Random(); String rootname = "f-"; long[] sizes = {0, 1, 50000000}; File testdir = new File(dirname); FileUtil.mkdirs(testdir); for (int i = 0; i < sizes.length; i++) { long size = sizes[i]; File file = new File(testdir, rootname + String.valueOf(size)); System.out.println(file.getName() + "..."); FileChannel fc = new RandomAccessFile(file, "rw").getChannel(); long position = 0; while (position < size) { long remaining = size - position; if (remaining > 1024000) remaining = 1024000; byte[] buffer = new byte[new Long(remaining).intValue()]; rand.nextBytes(buffer); ByteBuffer bb = ByteBuffer.wrap(buffer); position += fc.write(bb); } fc.close(); } System.out.println("DONE\n"); } catch (Exception e) { Debug.printStackTrace(e); } }