cancelled request

["Cox, Charlie" <cc...@cincom.com>]

I didn't see anything about this in the archives, so hopefully someone can
help me out here.

TC 3.2.1/IIS 5/W2K
I am using a servlet to serve a large file (50MB) and everything works fine
if it completes as requested. But if the user clicks 'cancel', I get
different results from Tomcat. Sometimes the servlet stops running where it
is, as if the thread is interrupted, while other times it continues running
like nothing happened. In the both cases the download box disappears from
the browser. Netscape 6.1,4.7 and IE 5.5 all act the same way. (IE 5.0 has a
problem here, but I have other problems with it too).

here's the code in my servlet providing the file

resp.setContentType("application/octet-stream; name=somefile.exe;");
resp.setHeader("Content-Disposition", "attachment;filename=somefile.exe;");
resp.setHeader("Content-Length", String.valueOf(filelength) + ";");	

InputStream isDownload;
isDownload = getServletContext().getResourceAsStream(filename);
BufferedInputStream bisDownload = new BufferedInputStream(isDownload,2048);
BufferedOutputStream bosDownload = new
BufferedOutputStream(resp.getOutputStream());
byte[] buff = new byte[2048];
int bytesRead;

while(-1 != (bytesRead = bisDownload.read(buff, 0, buff.length)))
{
	bosDownload.write(buff, 0, bytesRead);
}
bosDownload.close();
bisDownload.close();


The reason that this is an issue is that I send an email upon completion of
this download, and it shouldn't be sent if the user clicks 'cancel' but it
is being sent when the servlet continues processing. I've also wrapped this
code is a try/catch and no exception/error is ever thrown.

Charlie

RE: cancelled request

[Rajah Kalipatnapu <ra...@soundpipe.com>]

I'm not sure how far this helps. But try flush() every time you write bytes
to outputstream.
Even though u r loosing the advantage of BufferStream by flushing every
time, there is a chance that u'll get an IOException if the user cancels the
download and the IOStream is closed, as the flush() forces the bytes to the
end stream.

 while(-1 != (bytesRead = bisDownload.read(buff, 0, buff.length)))
 {
   bosDownload.write(buff, 0, bytesRead);
   bosDownload.flush();
 }

-Raj

-----Original Message-----
From: Barry White [mailto:barrywhite@charter.net]
Sent: Wednesday, October 17, 2001 2:50 PM
To: tomcat-user@jakarta.apache.org
Subject: Re: cancelled request


I have never done anything like that but I was thinking you could use some
kind of timeout in your servlet.  Try doing this in your while loop.  You
could also check bytesread and make sure it is changing.

hope this helps,
Barry
----- Original Message -----
From: "Cox, Charlie" <cc...@cincom.com>
To: <to...@jakarta.apache.org>
Sent: Wednesday, October 17, 2001 4:32 PM
Subject: cancelled request


> I didn't see anything about this in the archives, so hopefully someone can
> help me out here.
>
> TC 3.2.1/IIS 5/W2K
> I am using a servlet to serve a large file (50MB) and everything works
fine
> if it completes as requested. But if the user clicks 'cancel', I get
> different results from Tomcat. Sometimes the servlet stops running where
it
> is, as if the thread is interrupted, while other times it continues
running
> like nothing happened. In the both cases the download box disappears from
> the browser. Netscape 6.1,4.7 and IE 5.5 all act the same way. (IE 5.0 has
a
> problem here, but I have other problems with it too).
>
> here's the code in my servlet providing the file
>
> resp.setContentType("application/octet-stream; name=somefile.exe;");
> resp.setHeader("Content-Disposition",
"attachment;filename=somefile.exe;");
> resp.setHeader("Content-Length", String.valueOf(filelength) + ";");
>
> InputStream isDownload;
> isDownload = getServletContext().getResourceAsStream(filename);
> BufferedInputStream bisDownload = new
BufferedInputStream(isDownload,2048);
> BufferedOutputStream bosDownload = new
> BufferedOutputStream(resp.getOutputStream());
> byte[] buff = new byte[2048];
> int bytesRead;
>
> while(-1 != (bytesRead = bisDownload.read(buff, 0, buff.length)))
> {
> bosDownload.write(buff, 0, bytesRead);
> }
> bosDownload.close();
> bisDownload.close();
>
>
> The reason that this is an issue is that I send an email upon completion
of
> this download, and it shouldn't be sent if the user clicks 'cancel' but it
> is being sent when the servlet continues processing. I've also wrapped
this
> code is a try/catch and no exception/error is ever thrown.
>
> Charlie
>

Re: cancelled request

[Barry White <ba...@charter.net>]

I have never done anything like that but I was thinking you could use some
kind of timeout in your servlet.  Try doing this in your while loop.  You
could also check bytesread and make sure it is changing.

hope this helps,
Barry
----- Original Message -----
From: "Cox, Charlie" <cc...@cincom.com>
To: <to...@jakarta.apache.org>
Sent: Wednesday, October 17, 2001 4:32 PM
Subject: cancelled request


> I didn't see anything about this in the archives, so hopefully someone can
> help me out here.
>
> TC 3.2.1/IIS 5/W2K
> I am using a servlet to serve a large file (50MB) and everything works
fine
> if it completes as requested. But if the user clicks 'cancel', I get
> different results from Tomcat. Sometimes the servlet stops running where
it
> is, as if the thread is interrupted, while other times it continues
running
> like nothing happened. In the both cases the download box disappears from
> the browser. Netscape 6.1,4.7 and IE 5.5 all act the same way. (IE 5.0 has
a
> problem here, but I have other problems with it too).
>
> here's the code in my servlet providing the file
>
> resp.setContentType("application/octet-stream; name=somefile.exe;");
> resp.setHeader("Content-Disposition",
"attachment;filename=somefile.exe;");
> resp.setHeader("Content-Length", String.valueOf(filelength) + ";");
>
> InputStream isDownload;
> isDownload = getServletContext().getResourceAsStream(filename);
> BufferedInputStream bisDownload = new
BufferedInputStream(isDownload,2048);
> BufferedOutputStream bosDownload = new
> BufferedOutputStream(resp.getOutputStream());
> byte[] buff = new byte[2048];
> int bytesRead;
>
> while(-1 != (bytesRead = bisDownload.read(buff, 0, buff.length)))
> {
> bosDownload.write(buff, 0, bytesRead);
> }
> bosDownload.close();
> bisDownload.close();
>
>
> The reason that this is an issue is that I send an email upon completion
of
> this download, and it shouldn't be sent if the user clicks 'cancel' but it
> is being sent when the servlet continues processing. I've also wrapped
this
> code is a try/catch and no exception/error is ever thrown.
>
> Charlie
>