Couldn't load my image from the jar file

[Zamioculcas]

Hi guys,
I've run into a jar packaging problem. I would like to add some images to my program. You can find my simplified code below.
I use console application (so I can see what happens in the "background";) ) First I create a class file, subsequently run my application. Up to now everything is OK.
After that, I want to package my class and images files into a jar archive file. (I would like give my little application to others, and they can run my app in their machine.)

I used this command:

jar -cfv Demo.jar ImagesToJar.class imgs

and here was the result of the output:

added manifest
adding: ImagesToJar.class(in = 1337) (out= 813)(deflated 39%)
adding: imgs/(in = 0) (out= 0)(stored 0%)
adding: imgs/drum.gif(in = 617) (out= 511)(deflated 17%)
adding: imgs/Pluto.gif(in = 2159) (out= 2122)(deflated 1%)
adding: imgs/skate.gif(in = 359) (out= 349)(deflated 2%)


My images files are in the imgs subdirectory which is under the same directory with the class file. I would like to store the images in separate directory.

After packaging I edited the manifest file, I added the main-class name to the file.
Here is the content of my manifest:

Manifest-Version: 1.0
Created-By: 1.6.0 (Sun Microsystems Inc.)
Main-Class: ImagesToJar

When I run the jar application, i noticed the image file couldn't load on the frame. It seems my frame freezed after start the jar file.
Does anyone know what I'm doing wrong and how I might solve this issue? Might I set the Class-Path value in Manifest file?

I suppose there are some hocus-pocus around my jar structure, so I enclosed my image file. You can reproduce easily my problem to create the imgs directory next to my class file, and put my image into it.
I hope it helps to discover my problem.


Here is my simplified code: (If i omit the drawImage line, frame would display correctly without the image.)

Any suggestion would be great
Very thanks.

import javax.swing.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.awt.Graphics;

public class ImagesToJar extends JPanel{

public void paintComponent(Graphics g)
{
	BufferedImage img;
	try{
	img = ImageIO.read(getClass().getResource("imgs\\skate.gif")); //IT CAUSES MY PROBLEM
	g.drawImage(img,20,20,this);
	}
	catch(java.io.IOException ioe)
	{
		ioe.printStackTrace();
	}
	g.drawString("demo	 for testing",30,10);
}

public static void main(String[] args)
{
	ImagesToJar itj = new ImagesToJar();
	JFrame frame = new JFrame("gui with images...");
	frame.getContentPane().add(itj);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.setSize(400,400);
	
	frame.setVisible(true);
}

}

[Fubarable]

Don't use \\ in a jar file. Use / instead.

[Zamioculcas]

Very thanks Fubarable, your suggestion is engraved to my head. I will use a single Forward-Slash in the file path. (But the javac and java commands get on well with the double BackSlash. It's strange for me:) )
This problem is solved, but I have found some images which couldn't load in jar file.

I start a new post for this issue.Some "special gif file" couldn't load from my jar file

[quad64bit]

But the javac and java commands get on well with the double BackSlash. It's strange for me:)

When using javac, you're in the goofy windows command line, so you need to stick to those non-standard \ vs / conventions. Java does it the way everything else in the world does it (with a / ) so internally (programmatically and not from the windows command line), you use / as a directory delimiter. On non-windows systems, you would use / everywhere.

[JosAH]

On non-windows systems, you would use / everywhere.

Erm. Open VMS uses the dot (.), Tops 20 (DEC) used it too; the old Mac OS used a colon (:) and VOS (IBM) uses a > sign. I know, it's a mess everywhere ;-)

kind regards,

Jos

[quad64bit]

Yeah, but Jos, how much of that stuff is in use anymore? I still have some old system 7 macs in a closet somewhere, but come on. OS X has been around for 10+ years. Even our VAX at the university was retired almost 20 years ago! :D

[DarrylBurke]

When using javac, you're in the goofy windows command line, so you need to stick to those non-standard \ vs / conventions.

Not unless you're on some old non-supported Windows version, which actually ran on top of DOS and had a "MSDOS Prompt" feature. In all current versions, the a "Command Prompt" launched from cmd.exe accept both \ and / and even a mix of them in the same path. Just verified:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Darryl>e:

E:\>cd artwork/cards\50

E:\Artwork\Cards\50>

The old-style prompt launched from command.com requires the\ as a path separator.

But the javac and java commands get on well with the double BackSlash.

Double backslash?

db

[quad64bit]

TIL something new! Thank you Darryl!

[JosAH]

In all current versions, the a "Command Prompt" launched from cmd.exe accept both \ and / and even a mix of them in the same path. Just verified:[code]Microsoft Windows [Version 6.1.7601]

Yep, but there's a small gotcha again: path completion (the TAB key) doesn't work with foreward slashes while it does work with back slashes. Who on earth invented that?

kind regards,

Jos