Image resources in Jar file

Hi all,
I have a jar file having some image resources. When i run this jar file stand alone, it successfully loads the image resources from within itself. But when i use this jar file as library in some other application (with the class path defined in menifest file) it fails to load these images resources.
Any idea what's going wrong?
Regards,
Ghaznavi
PS: I am using getClass().getResource() method to locate image resources.

Just in case you didnt know, when you use file names from with in a JAR, the file names ARE case sensative.
So in a normall app, if you were linking to a file that was in ThisDirectory/ThatDirectory/filename.txt, could link to like this
ThisDirECTory/thatdirectory/filename.txt
or this
THISDIRECTORY/thatdirectory/filename.txt
but when your app is coming from a JAR you must specifie the filename exactly how it exists on the hard drive.!
Graham

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Read images from a jar file?

Hello, I'm converting a 6i app to 10g. This app does a ton of read_image_file() calls to
change GIF images on the screen based on user actions. In 6i the images are all stored on the local hard drive. The images are not icons for buttons, but images that appear in different locations on the screen.
For 10g, is it possible to leave the images in a jar file and effectively read the images from that? Otherwise, I suppose I'm looking at using webutil functionality to download the jar file and unjar it into an images directory for reading from the client?
Any best-practice scenario for this sort of thing?
Thanks for any info,
Gary

We are migrating from 6i to 10g too. And I try to not use webutil. All my pictures (icons gif files) are in a jar file.
Just make attention of the size of your pictures. The jar file is loaded when you launch the application (the first time, and after, only if the jar file has changed).

Images in a JAR file

Hi all,
I need see by code all the names of the resources (Images) that are includes into a JAR file. There are some function that do that work?.
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For example          /* test.jar is a jar file containing some files, one directory named traffic
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How do I store images in a jar file to be displayed on a jsp?

Afternoon all,
I have created a java component which accepts some parameters and returns a string. The returned string contains html tags to display a table in a webpage when rendered through a browser.
I want to be able to add this component to any java web project to display my table. The problem is that I want to use images in my table to give the appearance of curved corners.
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You won't be able to make the install of this library as simple as the installation of a jar file. You can't access the images directly in the jar.
There are a few approaches you can take:
1 - jar file + resources:
Have the install as being a jar and a "resources" directory which you store all the images in. Thus the images become part of the web application/web site and are accessible. Probably need to allow an entry in web.xml to configure where/what this directory is called.
2 - jar file only:
Provide a servlet to access the images, which will load them from the jar file, using the ClassLoader.getResourceAsStream(). Requires declaration of a servlet in the web.xml file. Won't be as efficient as having the images on disk, but will keep them bundled in the jar file.
you would generate code such as <img src="myImgServlet?img=.....">
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How to get resources from jar-files

Hi
in my app I load an image via the Toolkit.getImage() method.
Works fine if the app and the image are in folders on disk.
It fails to load the image, if the app (and the image) is packed in a jar file.
How can I get the image from there?
I try to get the image as follows:
String s = getClass().getResource("MyApp.class").getFile();
AppPath = s.substring(0,s.lastIndexOf("/"));
String PathToImages = "/images";
MyImage = (Image)Toolkit.getDefaultToolkit().getImage(AppPath+PathToImages+"/logo32.gif");The App starts and works, it just fails to load the images.
Any solutions??
thanx in advance
Herby

This is actually pretty easy. First a little background.
A Jar file is just a Zip file, with a few constructs for Java.
The getResource() method is used to create a mapping to data within the Jar file, but is actually not necessary after you know how the mapping works.
Just to give you an example of getResource:
// returned is a url to the resource you want from your Jar file.
URL myURL = MyClass.class.getResource("images/myimgage.gif");
// then you can use this URL to load the resource
Image img = getImage(myURL);If you were you look at the value of myURL you would see something similar to the followiing.
jar:http://www.mywebsite.com/mydir/myjarfile.jar!/images/myimage.gifJust to break it down for you.
The line always starts with the word jar:
Followed by the path to your jar file.
A sepearator !/
Then the file you are loading from the Jar file.
jar: path_to_jar_file !/ path_to_resource_in_jar_fileSo if you'd like, you could just create a URL object, and define the path to the object using the above method rather than using getResource.
Anyway, back to your code. What I would do is print out what you get for:AppPath+PathToImages+"/logo32.gif"I'm thinking you might be getting 2 "/" in your path because I think:AppPath = s.substring(0,s.lastIndexOf("/"));will leave the "/" at the end and the next line you add the "/" in front of the image directory name. So you my have the following for your image path.mypath//images

Resources from JAR files

This is doubtless very simple stuff, but I nonetheless cannot figure out where I?m going wrong. I just need to open up some image files as icons in my program, and I?m trying to put all of the classes and resources in one jar file. I?m loading the image using getResource, and I have the images in a folder in the same place as my classes. Everything works fine when the files are separate, and the images load successfully. But then I put all the files into a jar (preserving the same hierarchy) and suddenly getResource returns NULL and of course the pictures don?t load. Is there anything else I ought to be doing?
Many thanks,
Ned

Do any other ideas occur to anyone?Clearly there's a mismatch between the path used to reference the images, and the path where they live. This is pretty standard code, I've used it dozens of times, and I'm sure that the other responders have as well. On the surface, what you're doing looks right, so that only leaves one possibility.
Two, actually: you aren't by any chance running this in an app-server or web-server?
Assuming you aren't, put some debugging statements in, like this (not compiled, and I can't remember your image paths):
URL resourceUril = this.getClass().getResource("/some/path/here");
System.out.println("trying to load image from: " + resourceURL);This will print out a URL in the form jar:/some/path/here. Now display the contents of your jarfile, with jar tvf JARFILE. You'll see whether the path reported by the getResource() call is a valid path in your jarfile.

How to access images in a jar file

Hello,
I am currently developping a swing application that uses icons (gif files) and I have zipped all my classes and images in a single .jar file.
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Could anyone explain me how to achieve this ?
thanks in advance

I get the Images from jar file to set ImageIcon for my components like this:
ImagesLocator.getImage("imageName.gif");
anu
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import javax.swing.*;
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cheers!

I�m using WSDD 5.7 and I�ve created a build with the
"Device Developer Builds" tool to generate a jar
file. My project contains a package with images
inside, the problem is that everytime I generate the
jar file it does not contain that package. Any idea?I had the same problem and found a workaorund. See my thread in the WSDD forum for details:
http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?message=13774631&cat=9&thread=102493&treeDisplayType=threadmode1&forum=277#13774631

Loading images from a jar file

Hi,
My application displays images, until it's placed in a JAR file, then it can't display them even though the JAR file contains the images.
I saw this problem in a previous question which was solved using
URL url = MyClass.class.getResource("abc.gif");
Image img=Toolkit.getDefaultToolkit().getImage(url);
....which btw didn't work for me either......
This method should be made obsolete using ImageIcon, which I am using, but the images still won't appear...
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It works fine that way (...getClass().getResource....) until I create the jar file, and then I get a null pointer exception when it tries to load the image.
When I use
javax.swing.ImageIcon icon = new javax.swing.ImageIcon(("/images/imageName.jpg"));
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Can i load the image whilst it is still in the jar file or do i have to extract it to use it? Please help...
Frendy

In your class you are loading an image correct? Here is some code to do it.
try
URL imageURL = getClass().getClassLoader().getResource( "image.gif" );
if ( imageURL != null )
Toolkit tk = Toolkit.getDefaultToolkit();
Image image = tk.createImage( ( ImageProducer ) imageURL.getContent() );
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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);
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Toolkit toolkit = Toolkit.getDefaultToolkit();
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byte buffer [];
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fileName = e.nextElement().toString();
InputStream inputstream = jf.getInputStream(jf.getEntry(fileName));
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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);
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e.printStackTrace();
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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.

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morgalr, this is independent of code, it's just the splash screen that start up before any code runs so you could do this with any of your projects that you have.
You need to specify splash image via run command of:
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Problems accessing resources in JAR Files

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i'm using a third party software which isb trying to access a configuration file (xml file) residing inside its jar files.
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As i figured out the classloader is able to acess the resource In the Moment when the Handler is instantiated.
But later in the code (inside of the Handler) any call of getResource() with identical parameter for the resource name fails.
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Message was edited by:
a.rippich
Message was edited by:
a.rippich

Dear PCR Barry,
I am afraid that I must agree with my colleague Kostas, who replied to your first teststand post. These are very tricky, indepth issues, and will require quite significant investigation. Furthermore, it will be very difficult for us to answer via the forums as we will likely need more input from yourself. As previously suggested, if you have a Standard Service Program (SSP), you can generate a Service Request by calling or e-mailing your local branch.
Thank you for your time, and I am sorry that I have been unable to help you further,
Best wishes,
Rich R
Applications Engineer
National Instruments UK & Ireland

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Hi!
I don't know how to read images from an external jar file. Sun has a Java Look and Feel graphics repository that contains a lot of good images that can be used on buttons and so on. This repository is delivered as a jar file, containing only images, and I want to read the image files from that jar file directly without including them inside my application jar file. The application and image jar files will be in the same directory.
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Hi,
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