How can I know if the client has finished downloading a file

Question

In my web application clients can download files from the server. My code looks a bit like this:

public void downloadFile(HttpServletResponse response, String fileName){
       File fileToDownload = getFileWithName(fileName);
       updateContentTypeAndLength(response);
       OutputStream out = response.getOutputStream();
       FileUtils.copyFile(fileToDownload, out);
}

The thing is I need to know when the client has finished downloading the file, is there a way for me to know that? Thanks.

That seems to be responsibility of client side. How you are requesting ? — Suresh Atta, Dec 24 '13 at 19:42
Well they can't download it faster than you are sending it, so some time after the `copyFile` method call returns. — Sotirios Delimanolis, Dec 24 '13 at 19:42
might helpful :http://stackoverflow.com/questions/1524639/how-to-trigger-onload-event-when-downloading-a-file-in-an-iframe — Suresh Atta, Dec 24 '13 at 19:46
My intention is to be as sure as I can that the client did get the file (totally downloaded it). I'm pretty sure that once this 'FileUtils.copyFile(fileToDownload, out);' is over - it does not mean that the client did finished downloading this file. — Noam, Dec 25 '13 at 06:55

score 0 · Answer 1 · answered Dec 25 '13 at 03:01

0

if the method finished ,and don't have any error,you should know the client have finished the downloading file. or you can return a status to client.

answered Dec 25 '13 at 03:01

Bigbang

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How can I know if the client has finished downloading a file

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