Programming__WebObjects-Web Applications-Development-PDF Generation

  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()));
  }