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Display georaster dynamically

Hello,
New georaster are inserted in the oracle spatial database. I need to display these datas on a web page, the user can choose between the days as you can see here : http://hpics.li/a8b2156
The picture is generated automatically, it will be a layer on a Openlayer map for example.
So my question is : which tool is better to do that ? Oracle MapViewer, Qgis Server, Java Georaster API ? other ?
Do you have some ideas or advicices ?
Thanks best reguards
Answers
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I think you can get a Java RenderedImage object through Java Georaster API, and then you can use the following java API to get an image file.
static boolean ImageIO.write(RenderedImage im, String formatName, File output) throws IOException
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Okay, I'll read some documentation about that. Thanks.
But it's not possible to do that with MapViewer ?