Using/Implementing Appletstub Interface

java packages » java.applet

AppletStub serves as the interface between the applet and the browser environment or applet viewer environment in which the application is running. AppletStub is an easy way to make your applets run as standalone application without any redesign.

Java Example Program / Sample Source Code

import java.applet.Applet;
import java.awt.Button;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.AbstractAction;

public class AppletWithAppletStub extends Applet {

private Button button;

public void init() {
    button = new Button("Ok");
    button.addActionListener(new AbstractAction() {
      public void actionPerformed(ActionEvent event) {
        Frame frame = new Frame("Frame");
        frame.setSize(300, 100);
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
          public void windowClosing(WindowEvent event) {
            System.exit(0);
          }
        });
      }
    });
    add(button);
}

public static void main(String args[]) {
    final Applet applet = new AppletWithAppletStub();
    Frame frame = new Frame("AppletWithAppletStub");
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent event) {
        applet.stop();
        applet.destroy();
        System.exit(0);
      }
    });
    frame.add("Center", applet);
    // setting AppletStub
    applet.setStub(new AppletStubInterface(args, applet));
    frame.setVisible(true);
    applet.init();
    applet.start();
    frame.pack();
}
}

import java.applet.Applet;
import java.applet.AppletContext;
import java.applet.AppletStub;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;

public class AppletStubInterface implements AppletStub {
private Hashtable<String, String> hashtable;
private Applet applet;

public AppletStubInterface(String args[], Applet a) {
applet = a;
hashtable = new Hashtable<String, String>();
for (int i = 0; i < args.length; i++) {
try {
StringTokenizer parser = new StringTokenizer(args[i], "=");
String name = parser.nextToken().toString();
String value = parser.nextToken("\"").toString();
value = value.substring(1);
hashtable.put(name, value);
} catch (NoSuchElementException e) {
e.printStackTrace();
}
}
}

public void appletResize(int width, int height) {
applet.resize(width, height);
}

public AppletContext getAppletContext() {
return null;
}

public java.net.URL getCodeBase() {
String host;
if ((host = getParameter("host")) == null) {
try {
host = InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
java.net.URL url = null;
try {
url = new java.net.URL("file://" + host);
} catch (Exception e) {
}
return url;
}

public java.net.URL getDocumentBase() {
return getCodeBase();
}

public String getParameter(String param) {
return (String) hashtable.get(param);
}

public boolean isActive() {
return true;
}
}

Html Code

<html>
    <head>
        <title>AppletStubInterface</title>
    </head>
    <body>
        <applet code="AppletStubInterface" width="700" height="500"></applet>
    </body>
</html>

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