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From "Jan Tosovsky" <j.tosov...@tiscali.cz>
Subject RE: Creating an image on the fly from a servlet
Date Tue, 23 Feb 2010 19:11:21 GMT
> > Although I can see the result in the target browser, I am unable to
> save the
> > image on a local disk. Actually, in Firefox I can notice an attempt
> to save
> > the file, but in a download manager it is of zero size and it is not
> really
> > present in the target location. MSIE offers me save the PNG file in
> > format...
> The fact that you can see it and cannot save it very weird. Even
> weirder is the described MSIE behavior. If you are working with the
> trunk code, maybe your are getting bit by bug 48693 [1]? If you are
> working with Batik 1.7, that may be bug 46863 [2].

Thanks for this info. It led me to try also JPEG output, but the result is
the same. I suspect the way of closing the final stream. I think the browser
can display partial data but as they are unfinished properly, it made him
puzzled a bit.

Transcoding via command line is Ok in all cases.

> Could you try to analyze the (supposedly PNG) raw file saved and/or
> attach it to a reply?

No file is created in FF so there is nothing to analyze. And that MSIE BMP
file is the standard image. It is probably a kind of the screenshot of an
internal canvas.

Here is the final part of my code:

TranscoderOutput output = new TranscoderOutput(response.getOutputStream());
t.transcode(input, output);

// I've tried to find any closing method of the 'output' object, 
// but still without success. The following way also doesn't help
// output.getWriter().close();

ServletOutputStream out = response.getOutputStream();

Any other ideas?


> Hope this helps,
>  Helder
> [1] https://issues.apache.org/bugzilla/show_bug.cgi?id=48693
> [2] https://issues.apache.org/bugzilla/show_bug.cgi?id=46863

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