MiniClient.java

import java.applet.Applet;
import java.applet.AppletContext;
import java.applet.AppletStub;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.util.HashMap;
import javax.swing.JFrame;

public class MiniClient implements AppletStub {
 private HashMap<String, String> parameters = new HashMap<>();

 public MiniClient() throws Exception {
 // Jagex adds 300 to worlds in game, so 'oldschool216' is world 516, etc.
 String gameUrl = "http://oldschool216.runescape.com/";

 // Create window.
 JFrame frame = new JFrame("Runescape");
 frame.setSize(200, 0);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setResizable(true);
 frame.setVisible(true);

 // Read applet parameters, see http://oldschool1.runescape.com/jav_config.ws for example.
 while (true) {
 URLConnection connection = new URL(gameUrl + "jav_config.ws").openConnection();
 connection.setConnectTimeout(1000);
 connection.setReadTimeout(1000);
 try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
 String line;
 while ((line = reader.readLine()) != null) {
 int eqIndex = line.indexOf('=');
 if (eqIndex == -1) continue;

 String name = line.substring(0, eqIndex);
 if (!name.equals("msg")) {
 if (name.equals("param")) {
 int secondEqIndex = line.indexOf('=', eqIndex + 2);
 parameters.put(line.substring(eqIndex + 1, secondEqIndex), line.substring(secondEqIndex + 1));
 } else {
 parameters.put(name, line.substring(eqIndex + 1));
 }
 }
 }
 break;
 } catch (SocketTimeoutException e) {}
 }

 // Load Runescape applet.
 URLClassLoader classLoader = new URLClassLoader(new URL[] { new URL(gameUrl + parameters.get("initial_jar")) });
 String initialClass = parameters.get("initial_class");
 initialClass = initialClass.substring(0, initialClass.indexOf('.'));
 Applet applet = (Applet) classLoader.loadClass(initialClass).newInstance();
 applet.setStub(this);
 applet.resize(765, 503);
 applet.setPreferredSize(applet.getSize());
 applet.init();
 applet.start();
 frame.add(applet);
 frame.pack();
 }

 public boolean isActive() { return true; }

 public URL getDocumentBase() { return getCodeBase(); }

 public URL getCodeBase() {
 try {
 return new URL(parameters.get("codebase"));
 } catch (Throwable e) {
 return null;
 }
 }

 public String getParameter(String name) { return parameters.get(name); }

 public AppletContext getAppletContext() { return null; }

 public void appletResize(int width, int height) {}

 public static void main(String[] args) {
 try {
 System.setProperty("sun.java2d.opengl", "true");
 new MiniClient();
 } catch (Throwable e) {
 e.printStackTrace();
 System.exit(1);
 }
 }
}