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Java Forum / General / February 2006SAX and file chooser
How can I use SAX to parse an XML document which has been selected using a file chooser? I want to use an InputSource for the XMLReader to parse as this allows the parser to resolve relative paths within the XML document (ie. paths of schemas etc). However, as far as I can understand from what I've read (and I'm new to this so it probably isn't very far!), the InputSource takes a URI string as an input but the JFileChooser class outputs a File object. How can I load an XML document using the JFileChooser class and then parse it using an InputSource? Thanks in advance for any help, Steve > How can I use SAX to parse an XML document which has been selected > using a file chooser? I want to use an InputSource for the XMLReader to [quoted text clipped - 5 lines] > document using the JFileChooser class and then parse it using an > InputSource? See <http://java.sun.com/j2se/1.4.2/docs/api/org/xml/sax/InputSource.html> InputSource has several constructors: The one you mentioned (taking an URI-string), and 2 others (taking an InputStream, or a Reader). So you can choose what you like: File file = ...; // from your JFileChooser InputSource src = new InputSource(new FileInputStream(file)); or InputSource src = new InputSource(new FileReader(file)); or InputSource src = new InputSource(file.toURI());  Signature"Thomas:Fritsch$ops:de".replace(':','.').replace('$','@') > InputSource src = new InputSource(file.toURI()); oops! should be InputSource src = new InputSource(file.toURI().toString()); Signature"Thomas:Fritsch$ops:de".replace(':','.').replace('$','@') Ok, thanks very much! I'll give it a go Steve Am I correct in thinking that if I choose to use the code you gave an example of above using a URI string eg: InputSource input = new InputSource(file.toURI().toString()); that I do not need to 'close' anything when I have finished using the file? In the API it says, 'An InputSource object belongs to the application: the SAX parser shall never modify it in any way (it may modify a copy if necessary). However, standard processing of both byte and character streams is to close them on as part of end-of-parse cleanup, so applications should not attempt to re-use such streams after they have been handed to a parser.' Does this mean that it is not necessary to 'close' anything as you would do if you were using a BufferedReader or an InputStream? Or if you do need to take some action when you have finished with an InputSource, how do you go about it? Thanks Steve > Am I correct in thinking that if I choose to use the code you gave an > example of above using a URI string eg: [quoted text clipped - 15 lines] > you do need to take some action when you have finished with an > InputSource, how do you go about it? Maybe it's better if you explain what you intend to do after you have finished with an InputSource. See http://www.catb.org/~esr/faqs/smart-questions.html#goal - Oliver Ok, sorry. Basically I am writing an application which opens an XML file, parses it (including validation against a remote schema) and then eventually displays the data contained within the XML file pictorially (though I haven't got onto this bit yet). So far I have an application which can load a file and parse the XML file (and validate it). At the moment I am running it from the command line but the idea is that eventually I will create an executable jar file. Currently I have it so that only one file can be open at any one time although eventually I intend to make it possible to have multiple files open at once (using internal frames and desktop panes). Therefore, the user will be able to close files without closing the application as a whole. Therefore, I imagine it is fairly important to make sure that inputs which have been finished with are 'closed' properly otherwise you would end up with lots of inputs open not doing anything which would slow it down. I am aware that with classes such as BufferedReader there are methods like close() which close that particular input. I am using a SAX InputSource as shown in my previous post but after consulting the API I found that there isn't a 'close' method or equivalent for this. In the above post I was enquiring as to what the little snippet from the API I posted actually meant and did I need to take any further action to 'close' the input. Regards, Steve > Ok, sorry. > Basically I am writing an application which opens an XML file, parses [quoted text clipped - 21 lines] > 'close' the input. > Regards, Sorry, it looks like I misunderstood what you wrote earlier: <quote> if you do need to take some action when you have finished with an InputSource, how do you go about it? </quote> I thought you meant you wanted to do something after the XML parser finishes parsing, but before it closes the file, and you were asking how to prevent the XML parser from closing the file. My interpretation of the documentation is that the parser will close the stream for you automatically. If you're really nervous about it though, what I would do in your situation is to try to close the file anyway. And if an exception gets thrown, like FileAlreadyClosedException or something similar, then I'd just remove the code that closes the file twice. - Oliver Free MagazinesGet these publications absolutely FREE for up to 12 months. 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