Thread: JProgressBar

How would I find out the percentage of data that has been downloaded from this code?

public static void main(String[] args) throws Exception {
		pageAddressUrl = new URL("http://oldschool1.runescape.com/");
		String pageSource = readPageSource("http://oldschool1.runescape.com/");
		parseParameters(pageSource);
		String gamepackFileName = findGamepackFileName(pageSource);
		URLClassLoader classLoader = new URLClassLoader(new URL[] { new URL(
				"http://oldschool69.runescape.com/" + gamepackFileName) });
		Applet game = (Applet) classLoader.loadClass("client").newInstance();
		RS2Loader rs2Loader = new RS2Loader();
		game.setStub(rs2Loader);
		game.init();
		game.start();
		rs2Loader.add(game);
		rs2Loader.setDefaultCloseOperation(3);
		rs2Loader.setSize(773, 531);
		rs2Loader.setTitle("RuneScape");
		rs2Loader.setResizable(false);
		rs2Loader.setVisible(true);
	}

I'm going to create a JProgressBar to load up while this is downloading.