Hi,
I have set max file size in ServletFileUpload to
2MB.Because of that exception gets thrown when uploading file’s is greater
than 2MB.
If suppose user trying uploading file of size of 300MB,is that
whole file gets loaded in memory for checking file size?
Thanks and Regards,
Nitin Anande | Associate Consultant | +91 20 6670 7616 (O) +91
99752 45341 (M)
Oracle Financial Services PrimeSourcing
Pune, India
Oracle Financial Services Software Limited was formerly i-flex
solutions limited.
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Oracle is committed to developing practices and products that
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From: Steven Siebert
[mailto:[email protected]]
Sent: Tuesday, July 13, 2010 9:31 PM
To: Commons Users List
Subject: Re: [fileupload]:Storing file on disk temporarily
Hi Nitin,
One use case for this is file size. If the file you are uploading is
quite large, it's often a good idea to use a temp file on disk so that the
entire contents of the file aren't stored in memory before processing.
So, for example, if your client is uploading a >25MB file, instead of
reading it into an InputStream (memory) and then processing it into a byte[] to
store into the database, you can create the temp file and then process the file
in chunks (to save memory). This is very true if you need to do
pre-processing on the file before you store it to the DB (as you indicated you'll
be doing). If the file is a giant XML file, for example, you can stream
the contents through your processor to again reduce memory usage.
It should be noted, though, that saving files to disk may be a security
issue. If the user is able to upload executable files, they then have an
executable on the file system. Executing the file (post upload) could be
as simple as exploiting a known buffer overflow attack....Your UI (and pre-file
storage logic) can help prevent against this.
Another con to this approach, of course, is that you're taking a processor
(resource) hit for a memory (resource) gain. On most modern web servers
(in my experience), memory is usually the short supply in that equation.
Needs of the system should dictate how you approach this, of course =)
I hope this helped!
S
On Tue, Jul 13, 2010 at 10:59 AM, Nitin Anande <[email protected]> wrote:
Hi,
I have Common FileUpload for uploading file on DB.Can you
please tell me the pros and cons for storing file on disk temporarily till
request processing?
Your help will be highly appreciated.
Thanks and Regards,
![Oracle logo.gif]()
Nitin Anande | Associate
Consultant | +91 20 6670 7616 (O) +91 99752 45341 (M)
Oracle Financial Services PrimeSourcing
Pune, India
Oracle Financial Services Software Limited
was formerly i-flex solutions limited.
|
![Green Oracle]()
|
Oracle is committed to developing practices
and products that help protect the environment
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