OK, the ByteArrayOutputStream solves the NullPointer Exception. The only
problem left is there is none of my xml data in the pdf. I only get the
static header of the xsl document :o/
Do we have to change the sequence somehow?
> --- Ursprüngliche Nachricht ---
> Von: Jeremias Maerki <[EMAIL PROTECTED]>
> An: fop-users@xmlgraphics.apache.org
> Betreff: Re: How to pass input of xml tranfs. to xslt transf. ?
> Datum: Thu, 08 Dec 2005 16:04:32 +0100
>
> I'm not sure why you get an error that "handler is null". The setup
> looks ok now. The only thing that's missing is the ByteArrayOutputStream
> that FOP writes the PDF output to. In order to make PDF displaying work
> you need to know the size of the PDF so there's no way around buffering
> the PDF into a byte array. See some changes inline below.
>
> On 08.12.2005 15:50:48 Peter.Neu wrote:
> > First of all. Thanks for taking so much time for my problem :o)
> >
> > I tried to include your code. It's attached below:
> >
> > 1. the transformer factory with the implementation I use does not
> support
> > this call: this.transformerFactory.newTransformerHandler(xsltSrc); - so
> I
> > modified it a bit.
> >
> > 2. When I run the code I get the error that the handler is null :o/
> >
> > 3. I'm still not sure how to output the stuff to the browser.
> >
> > cheers,
> > Pete
> >
> > Code:
> >
> > SAXTransformerFactory tf = (SAXTransformerFactory)
> > SAXTransformerFactory.newInstance();
> > // my static xsl file in here
> > Source xsltSrc = new StreamSource((new
> > File(session.getServletContext().getRealPath("/xml/nbw.xsl"))));
> > TransformerHandler handler = tf.newTransformerHandler(xsltSrc);
> >
> > //Prepare FOP here
> > Driver driver = new Driver();
> > driver.setLogger(this.log2);
> > driver.setRenderer(Driver.RENDER_PDF);
> >
> //Setup a buffer to obtain the content length
> //Use the ByteArrayOutputStream from Jakarta Commons IO. It's more
> //memory-efficient
> ByteArrayOutputStream out2 = new ByteArrayOutputStream();
> driver.setOutputStream(out2);
> >
> > SAXResult result = new SAXResult(driver.getContentHandler());
> > handler.setResult(result);
> >
> >
> > XmlTransformer xmlt = new XmlTransformer();
> > xmlt.doXMLTransform(handler);
> > /* this is nothing but
> > * handler.startDocument();
> > handerl.startElement("BLA");
> > handerl.endElement("BLA");
> > hd.endDocument();
> > */
> >
> > //Prepare response
> > response.setContentType("application/pdf");
> > // response.setContentLength(out2.size());
> >
> > //Send content to Browser
>
> response.getOutputStream().write(out2.toByteArray());
>
> > response.getOutputStream().flush();
> >
> >
> > ---------------------------------------------------------------------
> >
> > > --- Ursprüngliche Nachricht ---
> > > Von: Jeremias Maerki <[EMAIL PROTECTED]>
> > > An: fop-users@xmlgraphics.apache.org
> > > Betreff: Re: How to pass input of xml tranfs. to xslt transf. ?
> > > Datum: Thu, 08 Dec 2005 14:53:19 +0100
> > >
> > > It's unclear what this XmlTransformer does exactly. You only
> instantiate
> > > a new instance but you do nothing with it.
> > >
> > > Anyway, I'll try to rework your code so you can pipe this stuff
> > > together:
> > >
> > > 1. You don't need the FileOutputStream anymore.
> > > 2. No need to configure the serializer if you just pipe the stuff
> > > through.
> > > 3. Since you do only an identity transform you don't need the first
> > > TransformerHandler. Instead set up the XSLT transformation as a
> > > TransformerHandler.
> > >
> > > SAXTransformerFactory tf =
> > > (SAXTransformerFactory)SAXTransformerFactory.newInstance();
> > >
> > > // my static xsl file in here
> > > Source xsltSrc = new StreamSource((new File(("nbw.xsl"))));
> > > TransformerHandler handler =
> > > this.transformerFactory.newTransformerHandler(xsltSrc);
> > >
> > > //Prepare FOP here
> > >
> > > SAXResult result = new SAXResult(driver.getContentHandler());
> > > handler.setResult(streamResult);
> > >
> > > XmlTransformer xmlt = new XmlTransformer(handler);
> > > //Start the XML generation, however you do this (see question above)
> > > xmlt.doSomething();
> > >
> > > This should send the SAX events generated by your XmlTransformer (not
> an
> > > ideal name IMO) through the TransformerHandler (for the XSLT
> transform)
> > > and its output further on to FOP.
> > >
> > > On 08.12.2005 14:31:23 Peter.Neu wrote:
> > > > protected void JAXPTransform(HttpSession session,
> > > HttpServletResponse response, HttpServletRequest req) throws Exception
> {
> > > >
> > > >
> > > > // Here I provide a file output stream for the result of the
> sax
> > > transformation -> what I need is some kind of stream
> > > >
> > > > File xmlfile = new
> > > File(session.getServletContext().getRealPath("/xml/"), "nbw.xml");
> > > > OutputStream out = new java.io.FileOutputStream(xmlfile);
> > > >
> > > > // set the stream result for the transformation
> > > > StreamResult streamResult = new StreamResult((out));
> > > > SAXTransformerFactory tf = (SAXTransformerFactory)
> > > SAXTransformerFactory.newInstance();
> > > > TransformerHandler hd = tf.newTransformerHandler();
> > > > Transformer serializer = hd.getTransformer();
> > > >
> > > > serializer.setOutputProperty(OutputKeys.ENCODING,
> "ISO-8859-1");
> > > > serializer.setOutputProperty(OutputKeys.INDENT, "yes");
> > > >
> > > > hd.setResult(streamResult);
> > > >
> > > > // the whole creation of the xml is done in the
> XmlTransformer
> > > which writes to the output file but should write it to some kind of
> stream
> > > > XmlTransformer xmlt = new XmlTransformer(hd);
> > > >
> > > > //from here on just the basic servlet example from here :
> > > > //
> http://xmlgraphics.apache.org/fop/0.20.5/servlets.html#xslt
> > > > Driver driver = new Driver();
> > > > driver.setLogger(this.log2);
> > > > driver.setRenderer(Driver.RENDER_PDF);
> > > >
> > > > //Setup a buffer to obtain the content length
> > > > ByteArrayOutputStream out2 = new ByteArrayOutputStream();
> > > > driver.setOutputStream(out2);
> > > >
> > > > //Setup Transformer
> > > > BufferedReader r = req.getReader();
> > > >
> > > >
> > > > this.transformerFactory = TransformerFactory.newInstance();
> > > >
> > > > // my static xsl file in here
> > > > Source xsltSrc = new StreamSource((new File(("nbw.xsl"))));
> > > > Transformer transformer =
> > > this.transformerFactory.newTransformer(xsltSrc);
> > > >
> > > > //Make sure the XSL transformation's result is piped through
> to
> > > FOP
> > > > Result res = new SAXResult(driver.getContentHandler());
> > > >
> > > > //Setup input
> > > > // This is the point where im stuck -> I don't know how to
> > > insert a stream in here
> > > > Source src = new StreamSource(new File("foo.xml"));
> > > >
> > > > //Start the transformation and rendering process
> > > > transformer.transform(src, res);
> > > >
> > > > //Prepare response
> > > > response.setContentType("application/pdf");
> > > > response.setContentLength(out2.size());
> > > >
> > > > //Send content to Browser
> > > > response.getOutputStream().write(out2.toByteArray());
> > > > response.getOutputStream().flush();
> > > >
> > > >
> > > > }
> > >
> > >
> > >
> > > Jeremias Maerki
> > >
> > >
> > > ---------------------------------------------------------------------
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> > >
> >
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>
>
> Jeremias Maerki
>
>
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