Copy file

Copy.java

public static void copyFile(File source, File dest, boolean overwrite)
		throws IOException
{
	if (!overwrite && dest.exists())
		throw new IOException("Can't copy " + source + " to " + dest + ". " +
				"The file already exists.");
	if (source.isDirectory())
		throw new IOException("Can't copy directories! Use recursiveCopy() " +
				"instead.");
	
	else if (overwrite && dest.exists())
		dest.delete();
	dest.createNewFile();
	
	// Declare input streams
	FileInputStream fIn = null;
	BufferedInputStream in = null;
	
	// Declare output streams
	FileOutputStream fOut = null;
	BufferedOutputStream out = null;
	
	final int bufferSize = 512;
	
	try
	{
		fIn = new FileInputStream(source);
		in = new BufferedInputStream(fIn, bufferSize);
		
		fOut = new FileOutputStream(dest);
		out = new BufferedOutputStream(fOut, bufferSize);
		
		int count = 0;
		byte[] buffer = new byte[bufferSize];
		while ((count = in.read(buffer, 0, buffer.length)) >= 0)
		{
			out.write(buffer, 0, count);
		}
		out.flush();
	} finally
	{
		// Make sure streams and channels get closed.
		if (in != null)
			in.close();
		else if (fIn != null)
				fIn.close();
		
		if (out != null)
			out.close();
		else if (fOut != null)
			fOut.close();
	}
}