It happened to me using IE to Tomcat on the local machine using
'localhost'. I switched to using the real network interface and it
fixed itself.
Joe
Alex Amies wrote:
>I have a problem with a servlet, which serves up pdf documents,
>invoking the servlet twice for every time I request the
>url using my browser. The pdf document is produced
>correctly in both instances. Anybody else seen this
>problem, know what it is, or have a constructive suggestion?
>
>The servlet gets data from a database, formats into xml,
>transforms it with Xalan, then again to a pdf, sending
>the content to a byte array where it is then written to
>the output stream. Here is a code fragment:
>
>Writer writer = new StringWriter();
>
>// Get an xslt processor factory
>TransformerFactory tFactory = TransformerFactory.newInstance();
>
>// Create the 3 objects the XSLTProcessor needs to perform the
>transformation.
>ReportInfo reportInfo = getReportData(request,res);
>String xml = reportInfo.getXml();
>StringReader stringReader = new StringReader(xml);
>Source xmlSource = new StreamSource(stringReader);
>Source xslSheet = getXSLInput(reportInfo.getReportNo());
>StreamResult xmlResult = new StreamResult(writer);
>
>Transformer transformer = tFactory.newTransformer(xslSheet);
>
>// Perform the transformation.
>transformer.transform(xmlSource, xmlResult);
>
>// send output from xsl transformation to a string reader
>// create a input source containing the xsl:fo file which can be fed to
>Fop
>Reader reader = new StringReader(writer.toString());
>writer.flush();
>writer.close();
>
>//set Driver methods to start Fop processing
>Driver driver = new Driver();
>
>driver.setRenderer("org.apache.fop.render.pdf.PDFRenderer",".14");
>driver.addElementMapping("org.apache.fop.fo.StandardElementMapping");
>driver.addElementMapping("org.apache.fop.svg.SVGElementMapping");
>driver.addPropertyList("org.apache.fop.fo.StandardPropertyListMapping");
>driver.addPropertyList("org.apache.fop.svg.SVGPropertyListMapping");
>
>// send pdf writer output to a byte array stream
>ByteArrayOutputStream baos = new ByteArrayOutputStream();
>PrintWriter printWriter = new PrintWriter(baos);
>driver.setWriter(printWriter);
>driver.buildFOTree(parser, new InputSource(reader));
>driver.format();
>driver.render();
>
>// send the bytes out to the servlet output stream
>res.setContentType("application/pdf");
>res.setContentLength(baos.size());
>
>long sixty = System.currentTimeMillis() + 60*1000;
>res.setDateHeader("Expires", sixty);
>baos.writeTo(res.getOutputStream());
>res.flushBuffer();
>
>
>
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