How-to: on-demand PDF using Apache FOP
How-to: on-demand PDF using Apache FOP
- Subject: How-to: on-demand PDF using Apache FOP
- From: Zak Burke <email@hidden>
- Date: Tue, 06 Dec 2005 09:07:22 -0500
I saw the iText thread here a few days ago and thought I'd post an an
on-demand PDF example using Apache FOP 0.90
(http://xmlgraphics.apache.org/fop/). Many FO examples are available
here: http://www.dpawson.co.uk/xsl/sect3/.
I've heard that there are instructions on how to do this in the
omnigroup archive, but that search engine seems to ignore many short
keywords. (Searching for "apache fo xml pdf" I get "ignored: fo xml pdf"
and then a bunch of helpful but irrelevant links about configuring
Apache httpd, and nothing matches "fop".) I don't know how you'll ever
find this post then, but I digress.
I am cross-posting this to the apple list because the only posts I found
there refer to version (0.20.x) and those instructions do not work for
version 0.90.x.
Finally, it is important to add "-Djava.awt.headless=true" to the
"Additional Arguments" list to suppress a console window running
WOBootstrap that will try to pop up and then fail to close, which seems
to prevent the thread from returning, which causes the app to hang.
Enjoy,
zak.
private ByteArrayOutputStream pdf()
{
// binary container for PDF
ByteArrayOutputStream out = null;
try
{
// assume these exist
String xsl, xml;
TransformerFactory transformerFactory = TransformerFactory.newInstance();
// configure FOP, apache's XML->PDF transformer
Fop fop = new Fop(MimeConstants.MIME_PDF);
out = new ByteArrayOutputStream();
fop.setOutputStream(out);
// configure XSLT transformer
Source xsltSrc = new StreamSource(new StringReader(xsl));
Transformer transformer = transformerFactory.newTransformer(xsltSrc);
// pipe XSL transformation through to FOP
Result res = new SAXResult(fop.getDefaultHandler());
// grab XML input stream
Source src = new StreamSource(new StringReader(xml));
// Start the transformation and rendering process
transformer.transform(src, res);
}
catch (Exception e)
{
// actually, catch the following, one by one:
// TransformerConfigurationException
// FOPException
// TransformerFactoryConfigurationError
// TransformerException
}
return out;
}
public void appendToResponse(WOResponse response, WOContext context)
{
ByteArrayOutputStream out = pdf();
// without data, show the PDF page, which is just an error message.
if (out == null)
super.appendToResponse(response, context);
// assume this exists
String filename;
response.setHeader("application/pdf", "Content-Type");
response.setHeader("" + out.size() + "", "Content-Length");
response.setHeader("attachment;filename=" + filename,
"Content-Disposition");
response.setContent(new NSData(out.toByteArray()));
}
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