java nio

import java.io.*;
import java.nio.*;
import java.nio.channels.*;

public class FastCopyFile
{
    static public void main(String args[]) throws Exception
    {
        if (args.length < 2)
        {
            System.err.println("Usage: java FastCopyFile infile outfile");
            System.exit(1);
        }
        
        String infile = args[0];
        String outfile = args[1];
        
        FileInputStream fin = new FileInputStream(infile);
        FileOutputStream fout = new FileOutputStream(outfile);
        
        FileChannel fcin = fin.getChannel();
        FileChannel fcout = fout.getChannel();
        
        ByteBuffer buffer = ByteBuffer.allocateDirect(1024);
        
        while (true)
        {
            buffer.clear();
            
            int r = fcin.read(buffer);
            
            if (r == -1)
            {
                break;
            }
            
            buffer.flip();
            
            fcout.write(buffer);
        }
    }
}