java copy file

[Old technique (pre JDK1.4)]

import java.io.*;

public class FileUtils{
 public static void copyFile(File in, File out) throws Exception {
   FileInputStream fis  = new FileInputStream(in);
   FileOutputStream fos = new FileOutputStream(out);
   try {
       byte[] buf = new byte[1024];
       int i = 0;
       while ((i = fis.read(buf)) != -1) {
           fos.write(buf, 0, i);
       }
   }
   catch (Exception e) {
       throw e;
   }
   finally {
       if (fis != null) fis.close();
       if (fos != null) fos.close();
   }
 }

 public static void main(String args[]) throws Exception{
   FileUtils.copyFile(new File(args[0]),new File(args[1]));
 }
}

[JDK1.4 using the java.nio package (faster)]

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

public class FileUtils{
   public static void copyFile(File in, File out)
       throws IOException
   {
       FileChannel inChannel = new
           FileInputStream(in).getChannel();
       FileChannel outChannel = new
           FileOutputStream(out).getChannel();
       try {
           inChannel.transferTo(0, inChannel.size(),
                   outChannel);
       }
       catch (IOException e) {
           throw e;
       }
       finally {
           if (inChannel != null) inChannel.close();
           if (outChannel != null) outChannel.close();
       }
   }

   public static void main(String args[]) throws IOException{
       FileUtils.copyFile(new File(args[0]),new File(args[1]));
 }
}

NOTE:
In win2000 , the transferTo() does not transfer files > than 2^31-1 bytes. it throws an exception of "java.io.IOException: The parameter is incorrect"
In solaris8 , Bytes transfered to Target channel are 2^31-1 even if the source channel file is greater than 2^31-1
In LinuxRH7.1 , it gives an error of java.io.IOException: Input/output error

more details are on:http://www.rgagnon.com/javadetails/java-0064.html