I'm still interested in hear any suggestions. I know that this is not strictly an S2 issue but it is related to using a Stream result type. If I was writing a servlet I would just get the OutputStream and write directly to it, putting the burden of buffering etc. onto the container.
What I decided to do (until I hear a better suggestion) is to write to a temporary file (File.createTempFile()) then for the InputStream I created a wrapper around FileInputStream which will delete the file when close() is called. This seems to work fine in the conditions I can test, not sure if close() will be called if the user hits Cancel in the middle of a very large download. Greg Lindholm wrote: > > Hi Folks, > > I'm using S2 Stream result type to allow users to download a CSV "file" > that I dynamically write from records selected from a database. > > First pass on this I'm using a StringWriter to write out the CSV data > (using SuperCSV) that using the string to build a ByteArrayInputStream for > the InputStream result. > > My concern is that the results could get very large based on the the > selection criteria the user supplies. So trying to do this all in-memory > with a StringWriter->String->Byte[] is likely a bad idea. > > I'm looking for advice on a better way of doing this? > I thought I could write to a temp file, but how do I ensure the file is > deleted when the download completes? > I also thought about using a PipedInputStream and hooking to a > PipedOutputStream which I write to in another thread, but this seems like > it could become overly complicated having to deal with the threads and > database sessions and error conditions etc. > > Do you know a better way? > > Any advice or suggestions would be appreciated. > > Thanks > Greg > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/-OT--S2-Stream-Result%2C-downloading-large-file%2C-advice-needed-tp19094823p19114445.html Sent from the Struts - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
