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,
Paweł 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娼ネ Wielgus <poulw...@gmail.com> wrote:
>
>> Hi all,
>> try this for example:
>>
>> public InputStream getInputStream() throws ParseException,
>> UnsupportedEncodingException {
>> StringBuffer sb = new StringBuffer("blablabla")
>> ....
>> return new
>> ByteArrayInputStream(sb.toString().getBytes("windows-1250"));
>> }
>>
>> Best greetings,
>> Paweセォ縞 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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