I think you should not use GWT RPC servlet, just use normal servlet.
2009/4/6, Superman859 <russ.d.hollo...@gmail.com>:
>
> I want to use iText to generate a PDF file. Ideally, I can
> incorporate a generatePDF() method into my interface and my Servlet
> that is involved in GWT-RPC. When that method is called, I want it to
> generate a PDF file and either display it to the user in a new window
> or present a save dialog box or anything - something that leaves the
> GWT app as it was and allows the user to view / save / print the PDF.
>
> Generating the PDF is not a problem. I can generate one and write it
> to a file on the server without any trouble. However, I am having
> trouble presenting the user with it (I would rather NOT write them to
> files on the server, and just let the user save on their own machine
> if they wish to do so).
>
> Here is code for a sample "Hello World"
>
> public boolean generatePDF(ReportDO report, int id) {
> System.out.println("hello world to follow");
> // get request
> //HttpServletRequest request = getThreadLocalRequest();
>
> // get response
> HttpServletResponse response = getThreadLocalResponse();
>
> Document document = new Document();
>
> // generate test PDF
> try {
>
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> //PdfWriter.getInstance(document, new FileOutputStream
> ("HelloWorld.pdf"));
> PdfWriter.getInstance(document, baos);
> document.open();
> document.add(new Paragraph("hello world"));
> document.close();
>
> // setting some response headers
> response.setHeader("Expires", "0");
> response.setHeader("Cache-Control", "must-revalidate,
> post-check=0,
> pre-check=0");
> response.setHeader("Pragma", "public");
>
> response.setContentType("application/pdf");
>
> // content length is needed for MSIE
> response.setContentLength(baos.size());
>
> // write ByteArrayOutputStream to ServletOutputStream
> ServletOutputStream out = response.getOutputStream();
> baos.writeTo(out);
> out.flush();
> }
> catch (Exception e) {
> System.out.println("generatePDF:Exception " +
> e.getMessage());
> }
>
> return true;
> }
>
> This code is in my GWT-RPC Servlet, which extends
> RemoteServiceServlet. Note if I use the currently commented line of
> FileOutputStream("HelloWorld.pdf") it will generate the file and work
> fine. However, if I try to send it to the browser, nothing appears,
> and the AsyncCallback for GWT-RPC calls the onFailure() method.
>
> Does anyone know where the problem might be? I'm assuming it has to
> do with response. RemoteServiceServlet has a method
> getThreadLocalResponse() which returns HttpServletResponse, which is
> what the iText examples use. I know very little about these response
> objects. But it seems that somehow there is some interference between
> that and GWT-RPC. The AsyncCallback is a success when writing to
> file. However, when attempting to send to browser, it fails.
>
>
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to Google-Web-Toolkit@googlegroups.com
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/Google-Web-Toolkit?hl=en
-~----------~----~----~----~------~----~------~--~---
