[jdom-interest] Detecting if file is XML

Olivier Jaquemet olivier.jaquemet at jalios.com
Fri Jul 16 00:45:32 PDT 2010

Thank you for sharing !

On 14/07/2010 15:00, Mattias Jiderhamn wrote:
> Thanks all for your suggestions. For some reason, the responses in 
> this thread didn't reach me until a month or so later.
> In my particular case, the file extension was not to be trusted (or 
> rather, would never be .xml), I wasn't interested in whether the XML 
> was valid or not (at the point of file type detection), but I needed 
> to take encodings and white space into account.
> Anyway, I just shared the solution on ForkCan. See 
> http://www.forkcan.com/viewcode/196/Detect-if-file-contains-XML
> </Mattias>
> ----- Original Message -----
> Subject: Re: [jdom-interest] Detecting if file is XML
> Date: Mon, 07 Jun 2010 07:39:41 -0400
> From: Rolf <jdom at tuis.net>
> Mattias Jiderhamn wrote:
> > This is semi-off topic, but what is the best way - performance wise -
> > to determine if a file is an XML file or not, from Java?
> >
> I have done this recently...
> I can't share the code, but I created a 'simple' SAX Handler that, after
> a configured amount ('X' amount) of 'valid' XML throws a custom
> exception. The 'calling code' listens for any exceptions. If it
> successfully parses the file, or it gets the special 'custom' exception,
> then it knows that the file is small and valid (no exception), or is
> larger, and the first 'X' amount of the file is valid XML.
> The SAX Handler does nothing with the content except count
> 'startElement()' and 'characters()' method calls.
> Makes for a pretty fast, efficient, validating handler..... without any
> unneeded 'overhead'.
> Sure, there may be a better way, but this worked for me...
> Rolf
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Olivier Jaquemet<olivier.jaquemet at jalios.com>
Ingénieur R&D Jalios S.A.
Tel: 0970 461 480

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