MinAppletviewer.java Source code

Introduction

Here is the source code for MinAppletviewer.java

Source

import java.applet.Applet;
import java.applet.AppletContext;
import java.applet.AppletStub;
import java.applet.AudioClip;
import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.Iterator;

import javax.swing.JFrame;

public class MinAppletviewer {
    public static void main(String args[]) throws Exception {
        AppSupport theAppSupport = new AppSupport();
        JFrame f = new JFrame();
        URL toload = new URL(args[0]);
        String host = toload.getHost();
        int port = toload.getPort();
        String protocol = toload.getProtocol();
        String path = toload.getFile();
        int join = path.lastIndexOf('/');
        String file = path.substring(join + 1);
        path = path.substring(0, join + 1);

        theAppSupport.setCodeBase(new URL(protocol, host, port, path));
        theAppSupport.setDocumentBase(theAppSupport.getCodeBase());

        URL[] bases = { theAppSupport.getCodeBase() };
        URLClassLoader loader = new URLClassLoader(bases);
        Class theAppletClass = loader.loadClass(file);
        Applet theApplet = (Applet) (theAppletClass.newInstance());

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        f.add(theApplet, BorderLayout.CENTER);

        theApplet.setStub(theAppSupport);

        f.setSize(200, 200);
        f.setVisible(true);
        theApplet.init();
        theApplet.start();
    }
}

class AppSupport implements AppletStub, AppletContext {
    private URL codeBase;

    private URL documentBase;

    public AppSupport() throws Exception {
        URL url = null;
        String urlpart = System.getProperty("user.dir");
        urlpart = urlpart.replace(File.separatorChar, '/');
        url = new URL("file://" + urlpart + "/");
        codeBase = documentBase = url;
    }

    public void appletResize(int w, int h) {
    }

    public AppletContext getAppletContext() {
        return (AppletContext) this;
    }

    public URL getDocumentBase() {
        return documentBase;
    }

    public void setDocumentBase(URL url) {
        documentBase = url;
    }

    public URL getCodeBase() {
        return codeBase;
    }

    public void setCodeBase(URL url) {
        codeBase = url;
    }

    public String getParameter(String s) {
        return null;
    }

    public boolean isActive() {
        return true;
    }

    public Applet getApplet(String name) {
        return null;
    }

    public Enumeration getApplets() {
        return new Enumeration() {
            public boolean hasMoreElements() {
                return false;
            }

            public Object nextElement() {
                return null;
            }
        };
    }

    public AudioClip getAudioClip(URL url) {
        return Applet.newAudioClip(url);
    }

    public Image getImage(URL url) {
        return Toolkit.getDefaultToolkit().getImage(url);
    }

    public void showDocument(URL url) {
    }

    public void showDocument(URL url, String target) {
    }

    public void showStatus(String status) {
        System.err.println(status);
    }

    public void setStream(String key, InputStream stream) throws IOException {
    }

    public InputStream getStream(String key) {
        return null;
    }

    public Iterator<String> getStreamKeys() {
        return null;
    }
}