How to get the end of a download action ?

Question

Hello !
My web application must download zip file.
Actually, the servlet's code for download is like this :
response.setContentType("application/download");
response.setHeader("Content-Disposition","inline; filename=DownloadFile");
ServletOutputStream l_ServletOutputStream = response.getOutputStream();
l_ServletOutputStream.write(l_ByteArrayOutputStream.toByteArray());
l_ServletOutputStream.flush();
The client can see a popup dialog box asking him to save the file on disk or open it or cancel. In case of save action, file is downloaded but I don't know when this action finished. Is there any event to catch or something else that inform about the end of downloading action ( I have to refresh the display with a new JSP ) ?
Thanks for your help !

Answer 1

Propably to correct way would be to use HTTP-headers to indicate the length of the file, so actual application download is possible also through other clients, rather than the specific one, so you could do:
response.setHeader("Content-length",l_ByteArrayOutputStream.toByteArray().length);I'm not really sure if servlets do this automatically, they really should though, but I'm hazy on their implementation and you might want to check the HTTP specification on whether or not the length of the headers should be included in the Content-length field, as it might be required to.
Tuomas Rinta