tags:

views:

508

answers:

4
+1  Q: 

Relative path in JLabel HTML

Hi, I am trying to make JLabel show an html which is referencing an image using a relative path. But I cannot make JLabel locate the image. It works fine when I am using absolute path.

I have tried running the program from the command line or from eclipse and add dialog to show me where is the current working directory but for avail. I have therefor came to the conclusion that the image is not searched in the current directory - which brings me to the point. where is the image looked for?

here is a test code that show what I am doing:

import javax.swing.*;

public class HTMLLabel extends JFrame {
    public HTMLLabel() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JOptionPane.showMessageDialog( this, 
          System.getProperty("user.dir"));

         String html = "<html>\n" +
     " <body>\n" +
     "  <div style=\"text-align: center;\">\n" + 
     "   <img src=\"file://s.png\">\n"+
     "  </div>\n"+
     " </body>\n"+
     "</html>";

         JLabel label = new JLabel(html);
         add(label);

         pack();
         setVisible(true);
    } 

    public static void main(String[] args) {
         new HTMLLabel();
    }
}
+2  A: 

Why are you even doing it like this? Just use this JLabel(Icon image) constructor

JLabel label = new JLabel(createImageIcon("s.png","description"));

protected ImageIcon createImageIcon(String path, String description) {
  java.net.URL imgURL = getClass().getResource(path);
  if (imgURL != null) {
    return new ImageIcon(imgURL, description);
  } else {
    System.err.println("Couldn't find file: " + path);
    return null;
  }
}

Or if you insist on the html variant.

btw The file protocol uses 3 slashes (file://s.png is invalid) and file:///s.png would mean C:\s.png. If the image resides in the starting directory you could use.

String path = System.getProperty("user.dir");
String html =
  "<html>\n" +
     "<body>\n" +
        "<div style=\"text-align: center;\">\n" +
          "<img src=\"file:///"+path+"/s.png\">\n"+
        "</div>\n"+
     "</body>\n"+
  "</html>";

But I make no guarantees about the 2nd solution.

jitter  2009-10-20 10:49:18
jitter, The reason I don't directly set the icon for the label is because there are two different programs involved here one that choose the html and one for showing it.and that is why I cannot use any of your solution (easily). but thanks (:
kroiz  2009-10-20 13:27:43
+1  A: 

I see two variants:

I don't know why but for me this works

"                       <img src=\"file:s.png\">\n"+

assuming that s.png is in current working directory.

Another variant that seems more appropriate for me is:

URL url = HTMLLabel.class.getResource( "/s.png" );
  String html = "<html>\n" +
    "       <body>\n" +
    "               <div style=\"text-align: center;\">\n" + 
    "                       <img src=\""+url+"\">\n"+
    "               </div>\n"+
    "       </body>\n"+
    "</html>";
 2009-10-20 10:52:39
Interesting I guess java automatically corrects the incomplete scheme + path to file:/// but fails on file://s.png
jitter  2009-10-20 10:59:18
It's really strange because java also corrects doubling of path separators (e.g. /gif//s.png and /gif///s.png to /gif/s.png )
 2009-10-20 11:09:03
contexte, indeed it works with <img src=\"file:s.png\">\n" +which is very strange but unfortunately I need it in a specific folder under the working directory and <img src=\"file:subdir/s.png\">\n" +Does not work.About the second solution you and jitter suggest, it is a bit of a problem, because the html is not hardcoded in the program that actually put it in the JLabel - it is created by another program and placed in a subdir of the working directory. It would require me to parse the html and replace the image src attribute with a absolute path - something I with to avoid.
kroiz  2009-10-20 13:29:00
and have you tried file:/// like jitter suggested?
 2009-10-20 15:36:40
Yeah, that did not help either.Very puzzling...
kroiz  2009-10-20 17:32:57
Do you think it could be a platform thingy? I am running ubuntu.
kroiz  2009-10-20 17:40:42
Look, I'm also working on Ubuntu. 8.10 to be precise. This works for me: <img src=\"file:subdir/s.png\"> . Where subdir is under current wirking directory.
 2009-10-22 07:24:53
May be you face some other problem? For example wrong case of folder names...
 2009-10-22 07:28:11
contexte, are you using openJDK or sun's java, maybe the difference comes from there.
kroiz  2009-10-22 11:26:29
no, I use Sun JDK version 1.6.0_10
 2009-10-22 11:29:30
This is my test - http://rapidshare.com/files/296357866/test_label.zip.html . Download, extract and run "java HTMLLabel". For me it works. I don't know how else I can help you:(
 2009-10-22 11:59:52
contexte, Thank you so very very much. it works now. you were right all along. I don't know what stupid mistake I have done. but now it works as you suggested from the start.I don't believe I wasted days on this....Thanks again for your persistence and dedication to help me.BTW the project you helped me with is an open source project which is hosted on source forge:http://sourceforge.net/projects/periman/
kroiz  2009-10-22 18:57:27
Great information contexte.
James P.  2010-03-22 17:50:44
A: 

I found that on windows the path can indeed be set to relative using something like that:

<img src=\"file:subdir/s.png\">

But on ubuntu that does not work! It only works w/o the subdir. Does anyone has any idea how can I write the img src to have a relative cross platform path? Pleeeaase....

kroiz  2009-10-21 23:31:38
not really:"Write Once, Run Anywhere(tm)"Is it?!
kroiz  2009-10-22 07:50:17
Is the sun implementation of Java is open source? All I could find is OpenJDK.
kroiz  2009-10-22 07:53:03
A: 

Thanks a ton.. Last couple of hrs i had spent for googling this solution and at last file:images/image.png works, thank you again

prashant  2010-04-29 11:36:28

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