Re: Detecting if file is XML
Mattias Jiderhamn <[email protected]>
| Newsgroups | gmane.comp.java.jdom.general |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> 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 _______________________________________________ To control your jdom-interest membership: http://www.jdom.org/mailman/options/jdom-interest/[email protected]