Exception when calling response.setContentLength

Question

Hi
I have a JSP page which calls a Java class that streams a PDF file to the browser.
This works great with Netscape/Mozilla/Opera, but not with Internet Explorer.
I got a tip that I should set the content length, but this fails. This is the exception I got:
java.net.ProtocolException: Didn't meet stated Content-Length, wrote: '240' bytes instead of stated: '61574' bytes.
at weblogic.servlet.internal.ServletOutputStreamImpl.ensureContentLength(ServletOutputStreamImpl.java:446)
at weblogic.servlet.internal.ServletResponseImpl.ensureContentLength(ServletResponseImpl.java:1026)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2560)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2260)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
Here is my Java method:
public void produserPDF(int brev_lnr, HttpServletResponse response, HttpServletRequest req) throws Exception {
byte b[];
int length = 0;
//Genererer PDF dokument. Returneres som en blob
lotteri.n_blob_brev lotteristub;
lotteristub = lotteri.n_blob_brevHelper.narrow(session.create("lotteri/n_blob_brev"));
try {
     //A byte array containing the PDF document
b = lotteristub.of_b_produser_pdf(brev_lnr, "BLOB");
String userAgent = req.getHeader("User-Agent");
//Triggering dialog box if browser is IE
if ((userAgent.indexOf("MSIE 5") != -1) ||(userAgent.indexOf("MSIE 6.0") != -1)) {
response.setHeader("Content-Type","application/x-octet-stream");
response.setHeader("Content-disposition", "attachment; filename=test.pdf");
} else {
response.setHeader("Content-Type","application/pdf");
//Setting the content length. This fails!!
response.setContentLength(b.length);
//get the output stream
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
out.write(b, 0, length);
out.flush();
out.close();
} catch (IOException e) {
logger.toWLlog( "Lotteri, IOException", e.getMessage());
} catch (Exception e) {
//throw new Exception("Error executing lotteristub.of_b_produser_pdf");
logger.toWLlog( "Lotteri", e.getMessage());
Any suggestions are very much appreciated?
Yours
Anders Rodahl

Answer 1

Anders,
Try the following code:
try
          response.setContentType("application/pdf");
          // later - do description               //
          FileInputStream MyIn = new FileInputStream(sFileName);
          File FS = new File(sFileName);
          Long L = new Long(FS.length());
          //byte byteArray[] = new byte[L.intValue()];     
          byte byteArray[] = new byte[8192];     
          response.setContentLength(L.intValue());
          java.io.OutputStream os = response.getOutputStream();
          int iCount = 0;     
          while((iCount = MyIn.read(byteArray)) != -1) {
               os.write(byteArray, 0, iCount);
          MyIn.close();
          os.flush();
          os.close();
catch (java.io.IOException ex)
}