Re: Serving files using tomcat

[Anhony]

I use this code and it works in my app. Their are small differences between 
how we copy the data to the response output. I don't know for sure, but this 
may account for why the fragment I posted works.

The difference is small, I think it would be worth giving it a try.
AS-
----- Original Message ----- 
From: "Steve Vanspall" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, May 04, 2005 11:47 AM
Subject: Re: Serving files using tomcat


Unfortunately that is what I do
OutputStream dos = null;
   FileInputStream fis = null;
  try
  {
   fis = new FileInputStream(rf.getPdf());
   response.setContentType("application/pdf");
   response.setContentLength((int) rf.getPdf().length());
   //response.setHeader(response.)
   dos = response.getOutputStream();
   int read = -1;
   byte[] bytes = new byte[100000];
   while((read = fis.read(bytes)) != -1)
    dos.write(bytes, 0, read);
   dos.flush();
   return mapping.findForward("PDF");
  } catch (Exception e)
  {
   // TODO Auto-generated catch block
   if(e instanceof SocketException)
    return mapping.findForward("reload");
   throw new IOException(e.toString());
  }
  finally
  {
   if(dos != null)
    dos.close();
   if(fis != null)
    fis.close();
  }
Acrobat now loads but the PDF doesn't appear.
Probably worth mentioning that I use struts, so I forward to a blank page
with the content type set to application/pdf, maybe that is the problem, 
but
not sure what else to do with the return.

When I do the same thing with a dynamic image and forward to a page with a
jpg content type, the image appears without a problem.
Steve
----- Original Message -----
From: "Anhony" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Thursday, May 05, 2005 1:02 AM
Subject: Re: Serving files using tomcat

Greetings,
Take a look at the code fragment below. It should serve as a good 
starting
point.
I hope this helps.

AS-
    private void processPDFRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException,
Exception
    {
        int bytesCopied = 0;
        FileInputStream fin = null;
        OutputStream out = null;
        String fileAddress = "The fully qualified path to your PDF file";
        if( fileAddress == null )
            return;
        int ext = fileAddress.lastIndexOf( '.' );
        if( ext != -1 )
        {
            ext = fileAddress.substring( ext+1,
fileAddress.length() ).toLowerCase();
            if( ext == "pdf" )
                response.setContentType("application/pdf");
            else
                "Do whatever you think best to do"
        }
        else
            "Do whatever you think best to do"
        try
        {
            out = response.getOutputStream();
            fin = new FileInputStream( fileAddress );
            bytesCopied = StreamCopier.copy( fin, out );
        }
        finally
        {
            if( fin != null )
                fin.close();
            if( out != null )
            {
                out.flush();
                out.close();
            }
        }
    }
----- Original Message -----
From: "Steve Vanspall" <[EMAIL PROTECTED]>
To: "Tomcat User List" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, May 04, 2005 9:29 AM
Subject: Serving files using tomcat
Hi,
I have been looking around and haven't found a solution that works
basically I have a PDF that gets created dynamically. Now to save memory 
I
have the PDF written to a file rather than a ByteArray. The only way I 
can
be sure that I wont encounter errors creating the file is to use
File.createTempFile. The creation goes of ok. And I have checked the file
itself and the PDF looks great.

How do i now serve this to the user who has requested it. If I try to
write
it to the response (using the same method I use to creare dynamic image,
this works), it just shows up a blank screen.
The problem also is, even if it did show the PDF, acrobat, to my
understand
will read only chunks of the stream and will go pack to get more. Thisis 
a
problem because there is nothing to go back for.

So the point,
If I can just redirect the browser to a file in the tomcat temp directory
(can I do that, will the use have access to that directory), then how do 
I
translate the location of the temp directory to a url that is accesible
outside.

If not then what other suggestions can people give me.
Thanks in advance
Steve

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