Re: problem: security using IDE's appletviewer

Knute Johnson <>
Tue, 06 May 2008 22:41:20 -0700
bH wrote:

Hi Knute,
You wrote "If you jar up your Applet, access the
image file with; getImage(getClass().getResource

The applet is correctly jar'd along with the image
and shows as expected when the jar is opened.
I have tested to see that it does work.

I do not know what, if anything, goes into the ()
of getImage(getClass().getResource())
to exctract only the image from the jar by itself,
so that the image can go into
another program in the same folder.

import java.awt.*;
import java.applet.Applet;
import java.awt.Image;

public class ImageAppletBriefX extends Applet
  private Image ioStream;
  private String errorMessage = null;
  public void init() {
      // the jar containing the image is
      // the image file in the jar is "JBsm.JPG"
      ioStream = getImage(getClass().getResource());
      // << the line in question is above
    catch (Exception netProblem )
      errorMessage = "Could not reach image";

  public void paint( Graphics display)
    if ( errorMessage == null )
      display.drawImage( ioStream, 0, 0, this );
      display.drawString( errorMessage, 10, 10 );

Thanks for your help up to this point


I'm not exactly clear what your problem is here. But I will give you a
complete example. Assume you have an image file named "kittens.jpg" and
you want to display it in your Applet. Furthermore you want to deploy
your Applet from a .jar file with the code and image store in the .jar.

import java.applet.*;
import java.awt.*;

public class test1 extends Applet {
     Image image;

     public void init() {
         image = getImage(getClass().getResource("kittens.jpg"));

     public void paint(Graphics g) {

         if (!g.drawImage(image,0,0,this))
             g.drawString("Loading Image",10,20);

Compile the code above. Jar up the file with the following command;

jar cvfM test1.jar test1*.class kittens.jpg

This stores all class files from the test1 class and the image file into
the jar.

         <applet archive="test1.jar" code="test1.class"
          width="640" height="480">

Create the html file above, I called mine test1.html.

Now run the appletviewer or load the html file with your browser;

appletviewer test1.html

The appletviewer/browser will load the .jar file and run the
test1.class, reading the kittens.jpg image file from the .jar and
displaying it. Until the image is completely loaded the message
"Loading Image" will be drawn onto the Applet as well.

You do not need a repaint() call if you are using the
ImageProducer/ImageObserver scheme.

If that is not what you needed, then please post again.


Knute Johnson
email s/nospam/linux/

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