public static void main(String[] args) throws Exception {
if (args.length != 2) {
System.out.println("arguments: sourcefile destfile");
System.exit(1);
}
FileChannel in = new FileInputStream(args[0]).getChannel(),
out = new FileOutputStream(args[1]).getChannel();
in.transferTo(0, in.size(), out);
// Or:
// out.transferFrom(in, 0, in.size());
}
/**
* copies file "in" to file "out"
*
* @param in
* @param out
* @throws java.io.IOException
*/
public static boolean copy(File in, File out) {
Boolean returnVal = true;
try {
FileChannel inChannel = new FileInputStream(in).getChannel();
FileChannel outChannel = new FileOutputStream(out).getChannel();
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
} catch (IOException e) {
returnVal = false;
} finally {
if (inChannel != null) inChannel.close();
if (outChannel != null) outChannel.close();
}
} catch (Exception ea) {
returnVal = false;
}
return returnVal;
}
public static void copyFileNIO(String filenameIn, String filenameOut, long kbchunks)
throws IOException {
FileInputStream in = new FileInputStream(filenameIn);
FileChannel inChannel = in.getChannel();
FileOutputStream out = new FileOutputStream(filenameOut);
FileChannel outChannel = out.getChannel();
long size = inChannel.size();
// outChannel.position(size-2);
// outChannel.write(ByteBuffer.allocate(1));
// outChannel.position(0);
if (debug)
System.out.println(
"read " + filenameIn + " len = " + size + " out starts at=" + outChannel.position());
long start = System.currentTimeMillis();
long done = 0;
while (done < size) {
long need = Math.min(kbchunks * 1000, size - done);
done += inChannel.transferTo(done, need, outChannel);
}
outChannel.close();
inChannel.close();
double took = .001 * (System.currentTimeMillis() - start);
if (debug) System.out.println(" write file= " + filenameOut + " len = " + size);
double rate = size / took / (1000 * 1000);
System.out.println(
" copyFileNIO("
+ kbchunks
+ " kb chunk) took = "
+ took
+ " sec; rate = "
+ rate
+ "Mb/sec");
}
/*
* Method used to move a file from sourceFile to destFile
*/
public static void moveFile(File sourceFile, File destFile) throws IOException {
FileChannel source = null;
FileChannel destination = null;
try {
source = new FileInputStream(sourceFile).getChannel();
destination = new FileOutputStream(destFile).getChannel();
long count = 0;
long size = source.size();
source.transferTo(count, size, destination);
} finally {
if (source != null) {
source.close();
}
if (destination != null) {
destination.close();
}
}
}
/*
* Perform a FileChannel.TransferTo on the socket channel.
*/
long transferTo(FileChannel fc, long pos, long len) throws IOException {
return fc.transferTo(pos, len, sc);
}