Loading images inside applet JAR

Hi
This is my issue: I have an applet which contains images inside the applet JAR. I want to display these images in my applet, but apparently due to browser access restrictions, I'm not allowed.
My first code was like this:
//security restrictions on browsers do not allow getResource
ImageIO.read(MyClass.class.getResource("imgs/img.png"));
//getResourceAsStream should be allowed by browsers
ImageIO.read(MyClass.class.getResourceAsStream("imgs/img.png"));Both lines work when I execute the applet locally (command line / programming IDE), but when I deploy it to my web server, the resource "imgs/img.png" becomes a relative URL to my web application context (like /webcontext/MyClass/imgs/img.png). It works locally because the call to getResource returns a URL object with "file:" protocol, but I need it to look for my images bundled inside the JAR, not web hosted images.
I need to avoid making the applet look for these images as a web resource... how can I do it?
Thanks!

dev@java wrote:
warnerja wrote:
I'm not convinced the code you posted wouldn't work, but since this is an applet, you have access to the Applet class. Check out the Applet.getImage method in conjunction with Applet.getCodeBase.
[http://java.sun.com/javase/6/docs/api/java/applet/Applet.html]
getCodeBase returns my web context, like http://myhost.com/mycontext/ , so it is pretty much the same as above.
Thanks for your replyThat is the way to load resources though. Hence back to my earlier statement about not being convinced it would not work, with this addition: It should work, assuming you actually do have the resources properly located with the web app, whether they be in a jar, or loose files relative to where the web app is. My guess at this point is that they are not.

Similar Messages

Issues with Loading Images from a Jar File

This code snippet basically loops through a jar of gifs and loads them into a hashmap to be used later. The images all load into the HashMap just fine, I tested and made sure their widths and heights were changing as well as the buffer size from gif to gif. The problem comes in when some of the images are loaded to be painted they are incomplete it looks as though part of the image came through but not all of it, while other images look just fine. The old way in which we loaded the graphics didn't involve getting them from a jar file. My question is, is this a common problem with loading images from a jar from an applet? For a while I had tried to approach the problem by getting the URL of the image in a jar and passing that into the toolkit and creating the image that way, I was unsuccessful in getting that to work.
//app is the Japplet
MediaTracker tracker = new MediaTracker(app);
//jf represents the jar file obj, enum for looping through jar entries
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compressed files are not the problem. It is just the problem of the read not returning all the bytes. Here is a working implementation:
InputStream is = jar.getInputStream(entry);
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
try{
byte[] buf = new byte[1024];
int read;
while((read = is.read(buf)) > 0) {
os.write(buf, 0, read);
catch(Exception e){
e.printStackTrace();
return null;
image = Toolkit.getDefaultToolkit().createImage(os.toByteArray());
This works but I think you end up opening the jar a second time and downloading it from the server again. Another way of getting the images is using the class loader:
InputStream is = MyApplet.class.getResourceAsStream(strImageName);
In this case, the image file needs to be at the same level than MyApplet.class but you don't get the benefit of enumerating of the images available in the jar.

Loading Images into Applets

I've been having problems loading an image into an Applet. I've found that when the getImage() call is put into the init() method it loads the image fine, also implementing an imageUpdate call. However, now I'm trying to expand on this by putting it into a button click, it hangs indefinitely while waiting for the image to load.
Another interesting point I've noticed is that the Canvas subclass ImageSegmentSelector uses a PixelGrabber in its constructor to put the Image into a buffer - when this class is created from the imageUpdate() call, NOT the init() call, the grabPixels() call hangs indefinitely too!!
Any feedback, please,
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import java.net.*;
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import java.awt.event.*;
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try { latitude = Integer.parseInt(t2.getText()); } catch (NumberFormatException e2) {System.exit(0); }
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catch(MalformedURLException e3) { System.exit(0);   }
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catch(InterruptedException e4) {System.exit(0);    } }
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Sorry, thought this had been lost.
You can load a file if the applet itself is run from the local filesystem - it loads it fine from the init(), but not otherwise. But I haven't got the applet to run from a browser yet without crashing (it's OK in the IDE debugger), so that's the next step.

Loading Images in Applets

Is it possible to use the Toolkit class to load images in "unsigned" applets. I tried that but it throws a security exception:
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Though I am reading the image from the server not the client machine.
Any help would be appreciated.
Thanks in advance,
Samer Meqdad

Here's the code:
Image img;
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     at com/ms/applet/AppletPanel.securedCall0 (AppletPanel.java)
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     at com/ms/applet/AppletPanel.processSentEvent (AppletPanel.java)
     at com/ms/applet/AppletPanel.processSentEvent (AppletPanel.java)
     at com/ms/applet/AppletPanel.run (AppletPanel.java)
     at java/lang/Thread.run (Thread.java)

Best place to load Images in applet game

Sorry for the double post but I just realised I originally posted this in completely the wrong forum!
Hello,
I have made a fairly basic game of 21/BlackJack and was wondering where the best place to load the card Images is/was...
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Ken,
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I solved this problem.

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Hi,
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Thanks

I've opened the JAR using winzip and, for some reason, the JAR hasn't preserved my file structure. So, when I try to look for an image as follows:
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the classes are
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This tutorial should resolve the problem
http://java.sun.com/docs/books/tutorial/applet/appletsonly/data.html

Loading images from a jar file

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Problem with loading image to Applet.

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Any ideas why this Image doesnt show up ?

michali7x4s1 wrote:
Thats a code i found somewhere, tried to check how some things work.Have you used exceptions before? If not, please read the sun tutorial on them as they are very very important. Also, whether this is your code or someone else's doesn't matter as it's yours now, and you would be best served by never throwing out exceptions as is done in this code. It's like driving with a blindfold on and then wondering why you struck the tree. It's always best to go through the tutorials to understand code before using it. If it were my project, I'd do it in Swing, not AWT. Fortunately Sun has a great tutorial on how to code in Swing, and I suggest you head there as well. Best of luck.

Loading Image outside the jar

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Loading images from a JAR

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SET_CUSTOM_PROPERTY(p_object_name, 1, 'IMAGE_NAME_ON', '/'||p_image_name);My question is the following:
- is there a way to load this image once and use it later without having to load it every time i clik on "A"? if yes, how?
P.S.: if this thread shouldn't be posted in this forum, please redirect me to the right one.
Thanks in advance

Ah okay.
I'm using the rolloverbutton.jar (RollOver Button PJC) [RolloverButton.java -> authors: Steve Button, Duncan Mills].
Here is the part concerning the IMAGE_NAME_ON function:
// make sure we are in rollover mode
enableRollover();
log("setProperty - IMAGE_NAME_ON value=" + value.toString());
// load the requested image
m_imageNameOn = (String) value;
loadImage(ON,m_imageNameOn);
// reset the currrently drawn image if needed
setImage(ON,m_state);
return true;where loadImage function is:
    URL imageURL = null;
    boolean loadSuccess = false;
    //JAR
    log("Searching JAR for " + imageName);
    imageURL = getClass().getResource(imageName);
    if (imageURL != null)
      log("URL: " + imageURL.toString());
      try
        m_images[which] = Toolkit.getDefaultToolkit().getImage(imageURL);
        loadSuccess = true;
        log("Image found: " + imageURL.toString());
      catch (Exception ilex)
        log("Error loading image from JAR: " + ilex.toString());
    else
      log("Unable to find " + imageName + " in JAR");
    //DOCBASE
    if (loadSuccess == false)
      log("Searching docbase for " + imageName);
      try
        if (imageName.toLowerCase().startsWith("http://")||imageName.toLowerCase().startsWith("https://"))
          imageURL = new URL(imageName);
        else
          imageURL = new URL(m_codeBase.getProtocol() + "://" + m_codeBase.getHost() + ":" + m_codeBase.getPort() + imageName);
        log("Constructed URL: " + imageURL.toString());
        try
          m_images[which] = createImage((java.awt.image.ImageProducer) imageURL.getContent());
          loadSuccess = true;
          log("Image found: " + imageURL.toString());
        catch (Exception ilex)
          log("Error reading image - " + ilex.toString());
      catch (java.net.MalformedURLException urlex)
        log("Error creating URL - " + urlex.toString());
    //CODEBASE
    if (loadSuccess == false)
      log("Searching codebase for " + imageName);
      try
        imageURL = new URL(m_codeBase, imageName);
        log("Constructed URL: " + imageURL.toString());
        try
          m_images[which] = createImage((java.awt.image.ImageProducer) imageURL.getContent());
          loadSuccess = true;
          log("Image found: " + imageURL.toString());
        catch (Exception ilex)
                log("Error reading image - " + ilex.toString());
      catch (java.net.MalformedURLException urlex)
        log("Error creating URL - " + urlex.toString());
    if (loadSuccess == false)
      log("Error image " + imageName + " could not be located");In this case, what shall i modify?
Thanks in advance

Loading images inside applet JAR

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