Quoting "Kenny G. Dubuisson, Jr." <[EMAIL PROTECTED]>:
> Sounds great but way over my head :P...would you mind sharing your code for
> me to look at. Thanks so much Bruno.
OK, as promised.
I made a reduced (UNTESTED) version of what I do normally in the
case I have to let the user wait for a document.
It might not work directly, you may have to change some things.
It would be nice if you could turn it into an example I can put
on my site:
CLASS MyPdfGenerator
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;
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 ba = new ByteArrayOutputStream();
/**
* @see java.lang.Runnable#run()
*/
public void run() {
try {
status = BUSY;
Document document = new Document();
PdfWriter.getInstance(document, ba);
document.open();
while (counter < TOTAL) {
document.add(new Paragraph(String.valueOf(counter)));
counter++;
}
document.close();
status = FINISHED;
}
catch(DocumentException de) {
status = ABORTED;
}
}
public int getPercentage() {
return counter / TOTAL;
}
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 ba.size();
}
public void writePdf(OutputStream out) throws IOException {
ba.writeTo(out);
}
}
CLASS PleaseWaitServlet
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class PleaseWaitServlet extends HttpServlet {
/**
* @see javax.servlet.http.HttpServlet#service(HttpServletRequest,
HttpServletResponse)
*/
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 (" +
generator.getPercentage()
+ "% done); please wait");
return;
}
if (generator.isFinished()) {
doPdfOutput(response, generator);
session.removeAttribute("PDF");
return;
}
if (generator.isAborted()) {
doHtmlOutput(response, "document generation was aborted,
please contact your system
administrator.");
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
generator) throws IOException {
response.setContentType("application/pdf");
response.setContentLength(generator.size());
ServletOutputStream out = response.getOutputStream();
generator.writePdf(out);
}
}
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