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Subject: RE: get image dimensions before upload?
From: simon <simon.kitching@chello.at>
To: Jakarta Commons Users List <user@commons.apache.org>
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	 <003601c83db2$340ba2f0$4900a8c0@dwdomain.local>
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Date: Thu, 13 Dec 2007 23:06:14 +0100
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Hi Andres,

Your example code does check before the data is written to disk on the
server, but after the data is transferred over the network.

But the question (as I understand it) was whether it is possible to
check the dimensions *before* the file is transferred from the client
machine to the server, ie whether it is possible to get the web-browser
to do this check.

And the answer (short of something like activex) is no.

Hmm..well, I guess a signed applet could be used in the page instead of
a normal file-upload control. That could then perform any desired
checks. That's a pretty big job though, and as a user of this website I
would not necessarily want to allow the applets to run on my machine
with filesystem access rights...

Regards,

Simon

On Thu, 2007-12-13 at 12:01 -0600, Andrés M. Luna wrote: 
> Hi, 
> 
> Is simple, in your code add 
> 
>         boolean isMultipart = ServletFileUpload.isMultipartContent(request);
>         FileItemFactory factory = new DiskFileItemFactory();
>         ServletFileUpload upload = new ServletFileUpload(factory);
>         List items=null;
> 	  int width = 0;
> 	  int height = 0;
>         items = upload.parseRequest(request);
>         Iterator iter = items.iterator();
>         while (iter.hasNext()) {
>             FileItem item = (FileItem) iter.next();
> 		
> 		//Validation code
> 		Image imageDimens = new ImageIcon(item.get()).getImage();
> 		width = imageDimens.getWidth(null);		
> 		height = imageDimens.getHeight(null);
> 
> 		if (width == 100 & height == 150) {
> 	            File uploadedFile = new File("image.gif");
>       	      item.write(uploadedFile);
> 		}
> 
> You need add in the import statements
> 
> import java.awt.Image;
> import javax.swing.ImageIcon;
> 
> 
> Regards,
> 
> Andrés Martínez
> 
> 
> -----Original Message-----
> From: loredana loredana [mailto:loredana888888@yahoo.com] 
> Sent: Thursday, December 13, 2007 7:02 AM
> To: user@commons.apache.org
> Subject: get image dimensions before upload?
> 
> Hi, i'm new to this list. I have a question. I have a page where a user can
> upload a image on the server. The way I did it was pretty basic:
> 
>         boolean isMultipart = ServletFileUpload.isMultipartContent(request);
>         FileItemFactory factory = new DiskFileItemFactory();
>         ServletFileUpload upload = new ServletFileUpload(factory);
>         List items=null;
>         items = upload.parseRequest(request);
>         Iterator iter = items.iterator();
>         while (iter.hasNext()) {
>             FileItem item = (FileItem) iter.next();
>             File uploadedFile = new File("image.gif");
>             item.write(uploadedFile);
> 
> I need to make sure that the image the user uploads is of height 150 and
> width 100 ....I can probably do that by saving the uploaded file, check the
> dimensions and delete it in case it's doesn't have the necesary size. But is
> there a way to check this before the file is uploaded? 10x
> 


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