New IO Duplicator : FileChannel « File « Java Tutorial

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class MainClass {

  public static void main(String[] args) throws IOException {

    FileInputStream inFile = new FileInputStream(args[0]);
    FileOutputStream outFile = new FileOutputStream(args[1]);

    FileChannel inChannel = inFile.getChannel();
    FileChannel outChannel = outFile.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
    int bytesRead = 0;
    while (bytesRead >= 0 || buffer.hasRemaining()) {
      if (bytesRead != -1)
        bytesRead = inChannel.read(buffer);
      buffer.flip();
      outChannel.write(buffer);
      buffer.compact();
    }

    inChannel.close();
    outChannel.close();
  }
}

11.51.FileChannel
	11.51.1.	Get FileChannel from FileInputStream
	11.51.2.	Using FileChannel to read text file
	11.51.3.	Using FileChannel to random access to a File
	11.51.4.	Writing and Appending a ByteBuffer to a File
	11.51.5.	A channel for a physical file
	11.51.6.	Using a Channel to Write a String to a File
	11.51.7.	Writing a String as Bytes
	11.51.8.	Writing Varying Length Strings to a File
	11.51.9.	Writing Numerical Data to a File
	11.51.10.	Writing Mixed Data to a File
	11.51.11.	The Gathering Write
	11.51.12.	Copying Files using FileChannel
	11.51.13.	New IO Copier
	11.51.14.	New IO Duplicator
	11.51.15.	Locking Copier
	11.51.16.	File concatenation based on new IO
	11.51.17.	New IO Transfer
	11.51.18.	Save and read text using FileChannel with UTF-16BE encoding
	11.51.19.	Save and read text using FileChannel without encoding
	11.51.20.	Using transferTo() between channels
	11.51.21.	Test overlapping locks on different file channels
	11.51.22.	Lock a FileChannel and release the lock
	11.51.23.	Create a read-only memory-mapped file
	11.51.24.	Create a read-write memory-mapped file
	11.51.25.	Copying a file using channels and buffers