Hi Pawel,
> But if this data has to be manipulated (concatenated, changed, etc.)
> the temporary file is needed if You don't want to put all data into
> memory.
FYI in my case, I need to manipulate with data from DB and files to create
a download file.
Thanks.
--- Pawe娼ネ Wielgus <poulw...@gmail.com> wrote:
> Hi,
> it all depends.
> Where You take data from - database?
> How You manipulate the data if any - are You combining some fields or
> something?
>
> It's possible to take some data from DB and read it from reasult set
> as a stream and just forward it to the user browser.
>
> But if this data has to be manipulated (concatenated, changed, etc.)
> the temporary file is needed if You don't want to put all data into
> memory.
> Of course You can create Your own stream that will put only small
> chunks of data into memory,
> but that's not trivial to do.
>
> Hope that helps,
> Pawe芝� Wielgus.
>
>
> 2010/9/16 <lunch...@yahoo.co.jp>:
> > Hi Wielgus,
> >
> > Thank you for the example.
> >
> > That example you provided can work fine.
> > But I'm afraid I can not apply this way.
> >
> > When using ByteArrayInputStream, I need to hold all contents of a
> download
> > file.But I must handle a huge file that can not be placed in
> memory.
> >
> > I'm sorry that I did not tell exactly.
> >
> > Thanks anyway.
> >
> > --- Pawe幞湿裙� Wielgus <poulw...@gmail.com> wrote:
> >
> >> Hi all,
> >> try this for example:
> >>
> >> public InputStream getInputStream() throws ParseException,
> >> UnsupportedEncodingException {
> >> 篠 篠 篠 篠 StringBuffer sb = new StringBuffer("blablabla")
> >> 篠 篠 篠 篠 ....
> >> 篠 篠 篠 篠 return new
> >> ByteArrayInputStream(sb.toString().getBytes("windows-1250"));
> >> }
> >>
> >> Best greetings,
> >> Pawe裘悉裘自賾� Wielgus.
> >>
> >>
> >> 2010/9/16 Tommy Pham <tommy...@gmail.com>:
> >> >
> >> >> -----Original Message-----
> >> >> From: lunch...@yahoo.co.jp [mailto:lunch...@yahoo.co.jp]
> >> >> Sent: Wednesday, September 15, 2010 9:23 PM
> >> >> To: Struts Users Mailing List
> >> >> Subject: Re: How to download a file without creating it on a
> >> server
> >> >>
> >> >> Hi Dave and Allen,
> >> >>
> >> >> Thank you for quick reply.
> >> >>
> >> >> Frankly speaking, I'm not familiarity with using stream and
> could
> >> not come
> >> >> up with some ideas.
> >> >>
> >> >> When I coded with java.io.PipedInputStream/PipedOutputStream
> >> >> like follwoing, I could download an empty file with
> >> IllegalStateException.
> >> >>
> >> >> If anyone give an example how to code,I will really appreciate.
> >> >>
> >> >> Thanks.
> >> >>
> >> >>
> >> >
> >> > IIRC, Struts uses the Apache Commons FileUpload
> >> > http://commons.apache.org/fileupload/.
> >> > You could read more about the Streaming API with examples in the
> >> provided
> >> > link.
> >> >
> >> > Regards,
> >> > Tommy
> >> >
> >> >
> >> >
> >>
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> >> >
> >> >
> >>
> >>
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> >>
> >
> >
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