You're setting objects as "session attributes", like a
Map of key-value pairs tied to the HTTP session.
-Matt
--- "Kenny G. Dubuisson, Jr."
<[EMAIL PROTECTED]> wrote:
> Bruno:
>
> In the sample code you gave me, I don't understand
> what a couple of lines
> are doing. The first one is:
> MyPdfGenerator generator = (MyPdfGenerator)
> session.getAttribute("PDF");
> I understand that it's creating a new generator
> object but I don't know what
> the getAttibute is for (the other line I don't get
> is the call to
> setAttribute). I've tried looking up the methods in
> the javax.servlet
> package but I can't seem to find the JavaDocs on
> that package. If you
> wouldn't mind explaining the use of the attibute I
> would very much
> appreciate it.
> Thanks,
> Kenny
>
> ----- Original Message -----
> From: "Kenny G. Dubuisson, Jr."
> <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, June 25, 2003 11:09 AM
> Subject: [iText-questions] Example of HTML "please
> wait" screen before PDF
> generation
>
>
> > Hello all. I've been working on the capability of
> a "please wait" screen
> > that will display while my PDF is being generated.
> I got some code from
> > Bruno and I've been trying to make it work to no
> avail. What the code is
> > supposed to do is write to the output stream in
> HTML format the "please
> > wait" screen and refresh every 3 seconds. If when
> it refreshes the
> document
> > is done, change the output stream to PDF and send
> the document. I have it
> > to the point that it seems to switch to PDF but
> never displays the
> document
> > (which at this point is just a page with the word
> "test" on it).
> >
> > The code separated into two files: MyPdfGenerator
> and PleaseWait Servlet.
> > I've included the two pieces of code below. Any
> ideas/comments would be
> > very much appreciated. Once I get this working
> I'll post to the list for
> > future reference. Thanks,
> > Kenny
> >
> > // MyPdfGeneration.java
> > import java.io.*;
> > import com.lowagie.text.*;
> > import com.lowagie.text.pdf.*;
> >
> > public class MyPdfGenerator implements Runnable
> > {
> > public static final int NOT_STARTED = 0;
> > public static final int BUSY = 1;
> > public static final int FINISHED = 2;
> > public static final int ABORTED = 3;
> >
> > private int status = NOT_STARTED;
> > private int counter = 0;
> > private static final int TOTAL = 1000;
> > private ByteArrayOutputStream baos = new
> ByteArrayOutputStream();
> >
> > public void run()
> > {
> > try
> > {
> > status = BUSY;
> > Document document = new
> Document(PageSize.LETTER, 0, 0, 0, 0);
> > PdfWriter writer =
> PdfWriter.getInstance(document, baos);
> > document.open();
> > PdfContentByte cb =
> writer.getDirectContent();
> >
> > document.add(new Paragraph("test"));
> >
> > document.close();
> > status = FINISHED;
> > }
> > catch (DocumentException de)
> > {
> > status = ABORTED;
> > }
> > }
> >
> > public boolean isBusy()
> > {
> > return status == BUSY;
> > }
> >
> > public boolean isFinished()
> > {
> > return status == FINISHED;
> > }
> >
> > public boolean isAborted()
> > {
> > return status == ABORTED;
> > }
> >
> > public int getStatus()
> > {
> > return status;
> > }
> >
> > public int size()
> > {
> > return baos.size();
> > }
> >
> > public void writePdf(OutputStream out) throws
> IOException
> > {
> > baos.writeTo(out);
> > out.flush();
> > baos.close();
> > }
> > }
> >
> > // PleaseWaitServlet.java
> > import java.io.*;
> > import javax.servlet.*;
> > import javax.servlet.http.*;
> >
> > public class PleaseWaitServlet extends HttpServlet
> > {
> > protected void service(HttpServletRequest
> request,
> > HttpServletResponse response) throws
> ServletException, IOException
> > {
> > HttpSession session =
> request.getSession(true);
> > MyPdfGenerator generator = (MyPdfGenerator)
> > session.getAttribute("PDF");
> > if (generator == null)
> > {
> > response.setHeader("Refresh", "3");
> > generator = new MyPdfGenerator();
> > Thread t = new Thread(generator);
> > t.start();
> > session.setAttribute("PDF", generator);
> > doHtmlOutput(response, "document
> generation was initialized..." +
> > "please wait");
> > return;
> > }
> > if (generator.isBusy())
> > {
> > response.setHeader("Refresh", "3");
> > doHtmlOutput(response, "document
> generation is busy...");
> > return;
> > }
> > if (generator.isFinished())
> > {
> > doPdfOutput(response, generator);
> > session.removeAttribute("PDF");
> > return;
> > }
> > if (generator.isAborted())
> > {
> > doHtmlOutput(response, "document
> generation was aborted");
> > session.removeAttribute("PDF");
> > return;
> > }
> > }
> >
> > protected void doHtmlOutput(HttpServletResponse
> response, String
> message)
> > throws IOException
> > {
> > response.setContentType("Text/html");
> > PrintWriter out = response.getWriter();
> > out.println("<html><body>");
> > out.println(message);
> > out.println("</body></html>");
> > out.flush();
> > out.close();
> > }
> >
> > protected void doPdfOutput(HttpServletResponse
> response, MyPdfGenerator
>
=== message truncated ===
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