Programmazione:Java/XML to PDF with fop

Per ottenere un PDF da un XML è possibile utilizzare la libreria FOP fornita da apache (http://xmlgraphics.apache.org/fop/).

Per effettuare questa trasformazione abbiamo bisogno fondamentalmente di x cose:

• Libreria del FOP preso dal sito di apache.
• XSL scritto in XSL-FO.
• XML da trasformare.

Document xml = self.getXML(utente, uc, fsc); // configure fopFactory as desired FopFactory fopFactory = FopFactory.newInstance();

FOUserAgent foUserAgent = fopFactory.newFOUserAgent(); // configure foUserAgent as desired

// Setup output HttpServletResponse resp = fsc.getResp(); OutputStream out = resp.getOutputStream(); resp.setContentType("application/pdf"); resp.setHeader("Expires","-1"); resp.setHeader("Cache-Control","no-store"); InputStream xsltfile = this.getClass().getResourceAsStream(self.getXSL(utente, uc, fsc)); if (log.isDebugEnabled()){ log.debug("XSL per la stampa: "+self.getXSL(utente, uc, fsc)); }

           // Construct fop with desired output format
           Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

           // Setup XSLT
           TransformerFactory factory = TransformerFactory.newInstance();
           Transformer transformer = factory.newTransformer(new StreamSource(xsltfile));
           
           // Set the value of a <param> in the stylesheet
           transformer.setParameter("versionParam", "2.0");
           StringReader sr = new StringReader(xml.asXML());
           if (log.isDebugEnabled()){

log.debug("XML per la stampa: "+D4JXmlTool.xml2String(xml, true)); }

            // Setup input for XSLT transformation
           Source src = new StreamSource(sr);
       
           // Resulting SAX events (the generated FO) must be piped through to FOP
           Result res = new SAXResult(fop.getDefaultHandler());

           // Start XSLT transformation and FOP processing
           transformer.transform(src, res);