Monitoring progress of URLs - How?

Question

I'm developing a very simple web-browser, and I would quite like to have a progress bar to display how much of the current page is loaded.
I have been trying to use a ProgressMonitorInputStream to get a dialog with a progress monitor to appear, but with no success. The code I'm using is:
ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(null, "Current Status",
url.openConnection().getInputStream());
ProgressMonitor pm = pmis.getProgressMonitor();
pm.setProgress(0);
pm.setMillisToDecideToPopup(100);
html.setPage(url);
where "html" is a JEditorPane and url is an URL object for the page I'm downloading.
Am I going about this the wrong way? Any pointers would be greatly appreciated.

Answer 1

Unfortunately you need something a like more complex since your current code is opening up the stream ok and wrapping it in the progress monitor but then when you pass the URL to JEditorPane it is then opening the stream itself and bypassing your monitor.
You need to create a sub-class of JEditorPane and override the method: getStream to return an InputStream that is wrapped in a ProgressMonitorInputStream and probably a BufferedInputStream as well...
You could even just do:
protected InputStream getStream (URL page)
throws IOException
     InputStream in = super.getStream (page);
    ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(null, "Current Status", in);
    ProgressMonitor pm = pmis.getProgressMonitor();
    pm.setProgress(0);
    pm.setMillisToDecideToPopup(100);
    return new BufferedInputStream (pmis);
}That might work but no promises...