This is harder to do than it should probably be, mainly because the JSP
will consistently try to send bits of whitespace (i.e. from between the
JSP tags) to the JSP's output writer, no matter how carefully you try to
eliminate any whitespace from between the JSP tags, while you want to
send binary data directly to the servlet's output stream.
This should work with Jasper-based JSP engines:
...
<%
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "filename=foobar.pdf");
// send PDF using response.getOutputStream() as the output stream; i.e.
// PdfWriter.getInstance(..., response.getOutputStream());
response.flushBuffer();
%>
...
JSP buffering should be enabled so that the call to response.reset()
will prevent any stray text/whitespace generated before this call from
being sent to the browser.
While the above will work, you will probably get errors because, after
the flushBuffer() call, the JSP will try to send mote text/whitespace
via the output writer, which isn't allowed once binary data has been
sent. A quick hack workaround is to create a subclass of
(javax.servlet.jsp.)JspWriter in which all of its (many) methods discard
their data, then assign it to 'out' after the flushBuffer call above:
out = new NullJspWriter();
The above hack may not be necessary--in my experience, the PDF is
correctly sent to the client and the errors, while annoying, are
harmless.
> -----Original Message-----
> From: Brian Burridge [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, January 11, 2005 8:22 AM
> To: iText
> Subject: Re: [iText-questions] PDF Generated is Blank
>
> I'm using Tomcat for the JSPs. I would really rather use
> JSPs, because I'm supposed to be integrating iText into an
> existing website without changing the architecture, and they
> use JSPs for everything. They have tag libraries that do all
> the data iteration and I was hoping to reuse those as well.
>
> Can you give any direction as to how to tell Tomcat to serve
> a JSP as binary?
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