Trying to load icon from jar file

Question

I am trying to load icons from a jar file. I have both tried to load it from classes within the jar file as well as classes outside the jar file.

outside of the

Answer 1

Icon icon = new ImageIcon(ClassLoader.getSystemResource("icons/mouse.png"));

From the JavaDoc of getSystemResource():

Find a resource of the specified name from the search path used to load classes...

This will find your icons even in a jar-file.

Answer 2

final java.net.URL imageURL3 = com.java.html.LoadHTMLExample.class.getResource( "icons/" );

works for the below directory structure

myjar.jar | |- ... |- LoadHTMLExample.class |- ... -- icons | - mourse.png

Thanks for the help everyone

Answer 3

I think that getResource gets the resource relative to the location of LoadHTMLExample.class. So your jarfile should be structured in the following way:

myjar.jar
 |
 |- ...
 |- LoadHTMLExample.class
 |- ...
 \-- icons
      |
      \- mourse.png

Also, you might be getting stream through getResourceAsStream than getting the URL.

Answer 4

I've always used the system class loader, whose path is relative to the root of the JAR:

URL url = ClassLoader.getSystemClassLoader().getResource("icons/mouse.png");
Icon icon = new ImageIcon(url);

Answer 5

Is the jar in question on the classpath of your runtime? I have a jar with PNGs in it, and I can recreate the nulls if I don't include it on the classpath. If the jar is there they go away.

Answer 6

Skip the class loader, and get the resource as a stream instead. If you don't need the URL you can turn them directly into BufferedImages like so. I've left the stream and exception handling as a further exercise.

InputStream stream = LoadHTMLExample.class
    .getResourceAsStream( "/icons/mouse.png" );
BufferedImage image = ImageIO.read( stream );

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Questioner needs the URL which brings us back to everyone else's suggestions. The images are definitely in the jar aren't they?