Thanks for your help. Finally this is what I did:
public class GetArticleImage extends RawScreen {
protected String getContentType(RunData data){
return "image/jpeg";
}
protected void doOutput(RunData rundata) throws Exception {
try
{
ArticlesManager mng = new ArticlesManager();
long id = rundata.getParameters().getLong("id");
Article article = mng.getArticle(id);
rundata.getResponse().setHeader("Content-Disposition","inline
filename=" + "img_"+System.currentTimeMillis()+".jpg");
ServletOutputStream out =
rundata.getResponse().getOutputStream();
byte[] picData = article.getImage();
out.write(picData);
out.flush();
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
and on my .vm file, the reference to this screen is:
<img src='$jslink.getTemplate("GetArticleImage")?id=$article.id' />
Hope this help future same problems!!
Michael Rothrock <[EMAIL PROTECTED]>
10-05-2004 14:23
Por favor, responda a
"Jetspeed Users List" <[EMAIL PROTECTED]>
Para
Jetspeed Users List <[EMAIL PROTECTED]>
cc
Asunto
Re: Display DB image
Actually, the content type has already been set long before the portlet
gets
called. You need to start at the beginning of the render pipeline,
specifically with the screen.
You have to create your own screen. Do this by extending
org.apache.turbine.modules.screens.RawScreen, implementing getContentType
and doOutput. In getContentType, return the appropriate MIME string for
your content, and in doOutput toss out the raw bytes using the output
stream
returned by the following call:
ServletOutputStream output = rundata.getResponse().getOutputStream();
I use a parameter on the URL to indicate which image I want when I invoke
the screen, i.e.:
http://localhost:8080/jetspeed/portal/screen/DownloadImage?image=1234
Both of the aforementioned methods grab the "image" parameter and use the
value as the key to find the image in the DB. This is the URL that I use
in
my <img ...> tag. My screen is called Download image, so I generate this
URL in my action code like so:
DynamicURI download = new DynamicURI(rundata, "DownloadImage");
download.addQueryData(ZbAppConstants.APP_IMAGE_TAG, imageID);
Oh, and just as an aside, you probably want read and cache the entire DB
row
that contains the image in the call to getContentType as this will save
you
a round trip to the DB.
I believe that you also have to do some stuff with your
TurbineResources.properties files, but I don't recall exactly what. I'll
leave that as an exercise for the reader.
-- Michael
On 5/10/04 10:19 AM, "Stuart Belden" <[EMAIL PROTECTED]> wrote:
> Have a servlet that fetches the data from the db and streams it? Set
> the content type in the response to image/jpeg or whatever and in your
> html do: <img src="/ImgServerServlet?id=12" alt="this is a db image">
>
> hth,
> stu
>
>>>> [EMAIL PROTECTED] 05/07/04 04:37PM >>>
> Hi.
> Actually I'm storing images on the DB. Until there, everything is OK.
> The
> problem is displaying it again in the browser.
> In the mailing list I found something like implement a RawScreen from
> Turbine, but I didn't understand it...
> Does anybody knows how can I display a java byte[] data as a jpg on the
>
> browser???
>
> Thank you very much!!
>
> Carlos.
>
>
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