Re: Using images in JAR archives
Ben Caradoc-Davies wrote:
You should use Class.getResourceAsStream():
http://mindprod.com/jgloss/getresourceasstream.html
Ensure that the image file is where you think it is. Open the jar as a
zip and double check. Check that the path you specify is correct.
This method seems a rather complicated matter. I switched the code of
the method loadImage() of the example above to the following code from
the net:
private ImageIcon loadImage(String path){
InputStream is = getClass().getResourceAsStream(path);
Image image = null;
if (is != null) {
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
int count;
while ((count = bis.read(buf, 0, buf.length)) != -1) {
baos.write(buf, 0, count);
}
image =
Toolkit.getDefaultToolkit().createImage(baos.toByteArray());
}catch (IOException exception) {
System.err.println("Error loading");
}
}
ImageIcon imageicon = new ImageIcon(image);
return imageicon;
}
This again works when used in Eclipse, but creates a
NullPointerException as before.
I'm getting the impression that the code I'm using is correct, but I
am doing something wrong in either creating the JAR or storing my
images. Does my example (with any of the loadImage() methods) work for
you if put into a JAR?
Nigel Wade wrote:
The above relative path is relative to the ShowImages class. This means that the
images directory must be in the same directory as the ShowImages.class file.
[...]
I prefer to use absolute paths in the jar file for images so I can place them
where I want in the jar filesystem. You say you've tried that but it didn't
work. It should do if you do it correctly. You need to show us the code which
failed.
The images directory is in the same directory. Replacing the relative
path "images/image1.gif" with the absolute path "/images/image1.gif"
in the given example doesn't help, the problem is still the same.
javax.swing.ImageIcon(getClass().getResource("/icons/stock-preferences.png"));
where the icons directory is in the root of the jar file
This is very strange, as it is just the same I am using, see the code
in my first post.
Does my example run when you put it into a JAR? If so, which method do
you use?
$ jar tf Administration.jar
...
icons/stock-preferences.png
...
This command has the following output:
jar tf CompressingJARs.jar
META-INF/MANIFEST.MF
ShowImages.class
ShowImages.java
images/
images/image1.GIF
Jeez...