html contained in jar

[johnmmcparland]

Hi all,

this seems like a commonly asked question, but so far I haven't found
an answer that works.

I wish to have a jar file which by containing a class which extends
JEditorPane and some html files, will display the html files which are
located inside the jar.

At the moment, I have a jar file with the following contents;

META-INF/
META-INF/MANIFEST.MF
help/
help/index.html
ui/
ui/Browser$HTMLBrowser$LinkListener.class
ui/Browser$HTMLBrowser.class
ui/Browser.class
ui/Browser.java

The Browser inner class HTMLBrowser extends JEditorPane to display html
(in this case help/index.html).

The code is below,

package ui;

import java.io.File;
import java.io.IOException;
import java.net.URL;

import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

public class Browser extends JFrame
{
private HTMLBrowser browser;
private static final long serialVersionUID= 1;

public Browser()
{
setTitle("Help");
browser= new HTMLBrowser();
setContentPane(browser);
setSize(800,600);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}

private class HTMLBrowser extends JEditorPane
{
private static final long serialVersionUID= 2;
private static final String dir= "help";
private static final String startPage= "index.html";

public HTMLBrowser()
{
URL url;
try
{
// Construct the URL
// This is;
// current dir + separator + help dir + separator + startPage
String s= (new File(".")).getCanonicalPath();
String separator= System.getProperty("file.separator");
String t= s + separator + dir + separator + startPage;
// DEBUG
System.out.println(t);
File f= new File(t);
url= f.toURL();
setPage(url);
}
catch (Exception e)
{
System.out.println( "Problem setting help homepage");
}
setEditable(false);
addHyperlinkListener(new LinkListener(this));
}

private class LinkListener implements HyperlinkListener
{
private HTMLBrowser browser;

public LinkListener(HTMLBrowser b)
{
browser= b;
}

public void hyperlinkUpdate(HyperlinkEvent he)
{
if (he.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
{
try
{
URL newPage = he.getURL();
browser.setPage(newPage);

}
catch (IOException ioe)
{
System.out.println( "Error opening new page");
}
}
}
}

}


public static void main(String[] args)
{
new Browser();
}

}

When I run this using "java Browser" (inside ui dir") it works (i.e.
displays the html page I want)
When I run the jar in the directory containing the "help" and "ui"
directories it works fine.
But when I run the jar anywhere else it does not work. The html page
is not displayed. Instead a blank JEditorPane is all that can be seen.

How can I get my class to look at the help/index.html file from within
the jar?

Thanks in advance,

John

 

[Andrew Thompson]

johnmmcparland wrote:
....

this seems like a commonly asked question, but so far I haven't found
an answer that works. ...
How can I get my class to look at the help/index.html file from within
the jar?

getResource()

Andrew T.

 

[johnmmcparland]

Nope I'm afraid that using get resource as follows;

public HTMLBrowser()
{
URL url;
try
{
// Construct the URL
String separator= System.getProperty("file.separator");
String t= separator + dir + separator + startPage;
// DEBUG
System.out.println(t);
url= getClass().getResource(t);
setPage(url);
}
catch (Exception e)
{
System.out.println( "Problem setting help homepage");
}
setEditable(false);
addHyperlinkListener(new LinkListener(this));
}

did not work.

 

[johnmmcparland]

Hmm but constructing the string as so;


String t= "/" + dir + "/" + startPage;

does work. Strange.

 

[Andrew Thompson]

Hmm

Pleas refrain from top-posting - even when replying
to your own posts..

top-post corrected for clarity.

....
...but constructing the string as so;

String t= "/" + dir + "/" + startPage;

does work. Strange.

Not so strange, really. URL's always use the '/'.

Using the file separator is only appropriate for getting
files off the 'file system', as opposed to resources out
of jar archives.

HTH

Andrew T.