content type

[nemya]

Hi,
I'm trying to make to export a Datatable to Excel. For this I need to specify the content type of the page.
I tried this:

<f:view contentType="application/vnd.ms-excel">

But a have a not recognized contenttype exception.

So how can I specify the content type of a page.
JBoss Seam 2.0.0.CR1 + JBoss AS 4.2.1.GA

[thejavafreak]

Aren't you supposed to use POI for this?