I have recreated a number of StreamingResponse methods from both the
Loop link above and the Lift book and I still can't seem to get the
desired effect. I have been able to get a PlainTextResponse to work
by using LiftRules.dispatch in the Boot, like so:
LiftRules.dispatch.prepend {
case Req(("analysis" :: "inprocess" :: Nil), _, _) =>
() => Full(PlainTextResponse("test"))
}
However, I am unable to get any sort of streaming response to work in
the particular snippet which contains the data I would like to use.
Here are some of the methods I've tried:
def textResponse: Box[LiftResponse] = {
println("TEXT RESPONSE")
val ab = "text would go here"
Full(PlainTextResponse(ab,
("Content-Type" -> "text/plain") :: Nil, 200
))
}
def streamingResponseFile: Box[LiftResponse] = {
println("STREAMING RESPONSE FILE")
val file: File = new File(
"C:\\Source\\trunk\\eclipse\\testLift\\src\\main\\webapp\\images\
\ultra.png"
)
val length = file.length
val fileInput = new java.io.FileInputStream(file)
Full(StreamingResponse(fileInput,
() => { fileInput.close },
length,
("Content-Type" -> "image/png") :: Nil,
Nil,
200)
)
}
Do I have to make a LiftRules.dispatch function in the Boot in
addition to the StreamingResponse in my snippet?
I am trying to download plain text, but it is variable and dependent
on some parameters and other variables in the particular Snippet
class. Would I have to pass that data into the boot method in order
to get the desired response? I would prefer to handle it entirely in
the snippet itself.
Finally, I'm not really sure how exactly to handle the
Full(StreamingResponse) once I have created it in order to actually
download the data and save it to the client computer. Although I
assume the browser will handle this one I've formatted the Response
correctly and actually have it working.
Thanks again,
David
On Mar 4, 11:13 am, Marius <[email protected]> wrote:
> If you want todownloadthrough Lift than yes you can use
> StreamingResponse, or simply any other LiftResponse (depending on your
> mime-type) and use LiftRules.dispatch mechanism. But you could also
> let the container to serve thefile. By default Lift is trying to
> serve .html, .xhtml, .htm, .xml etc.. You can write your own rules by
> setting
>
> LiftRules.liftRequest = {
> case req => true // Pattern match whatever you like and return a
> Boolean
>
> }
>
> If Lift cannot find a resource for some reason and you want the
> container (or subsequent filters) to handle that you can set
>
> LiftRules.passNotFoundToChain = true
>
> On 4 mar., 17:09, DavidV <[email protected]> wrote:
>
> > I am also looking todownloadafilefrom the server that is hosting
> > my Lift web app. There is a very useful fileUpload method in the
> > SHtml class and I was wondering if there may be something similar for
> > afiledownload? I was unable to find anything, and searching for
> > "Lift" or "Scala Liftdownload" on Google returns nothing but pages to
> >downloadthe libraries, plugins or source code. I suppose I could use
> > the StreamingResponse, but I am already saving thefileI need to the
> > server and it would be nice to be able todownloadit to any client
> > computer with the typical "Browse" button, similar to the upload,
> > Thanks,
> > David
>
> > On Feb 14, 3:58 pm, Gang <[email protected]> wrote:
>
> > > Thanks Tim, that's exactly what I'm looking for!
>
> > > On Feb 14, 11:27 am, Timothy Perrett <[email protected]> wrote:
>
> > > > See:
>
> > > >http://blog.getintheloop.eu/2009/3/19/understanding-lift-s-streamingr...
>
> > > > Construct the CSV in memory and just then stuff it into a streaming
> > > > response as a byte array.
>
> > > > Cheers, Tim
>
> > > > On 14 Feb 2010, at 16:18, Gang wrote:
>
> > > > > Hi,
>
> > > > > I have a question and it may not be a pure Lift one. But since I'm
> > > > > working on a Lift app and this group is the most responsive one I have
> > > > > seen, might just try it here.
>
> > > > > I need todownloaddata from database in CSV format. What is the best
> > > > > approach within Lift framework? Do I have to write the data on the
> > > > > server somewhere and then provide user with a link? I have tried to
> > > > > google "scala, lift,filedownload...", but could not come up with
> > > > > what I'm looking for. Maybe I didn't use the right key words in
> > > > > search? Thanks in advance!
>
> > > > > Brs
> > > > > Gang
>
> > > > > --
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