Java XML-Reader (SAX)--How to read and display xml-element-data???

Question

hello all,
i would like to display just some xml-data
Which methods in java should i use to select just one character-data of this (for example: "deu" from the element <Language> or the attribut "version" of the element <catalog>).
Here is the XML-document i want to parse and display it with System.out.print() :
<BMECAT version="1.2">
     <HEADER>
          <GENERATOR_INFO>
               e-proCat 2.1, e-pro solutions GmbH
          </GENERATOR_INFO>
          <CATALOG>
               <LANGUAGE>deu</LANGUAGE>
               <CATALOG_ID>Katalog 01</CATALOG_ID>
               <CATALOG_VERSION>001.000</CATALOG_VERSION>
               <CATALOG_NAME>ETIM</CATALOG_NAME>
               <DATETIME type="generation_date">
                    <DATE>2002-05-22</DATE>
               </DATETIME>
               <TERRITORY>DE</TERRITORY>
               <CURRENCY>EUR</CURRENCY>
               <MIME_ROOT>ETIM-Daten</MIME_ROOT>
          </CATALOG>
</HEADER>
</BMECAT>
Here is the java application i wrote and which doesn t work:
import org.apache.xerces.parsers.SAXParser;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
     public class XmlLeser implements ContentHandler {
public XmlLeser(String fileName) {
try {
XMLReader myParser = new SAXParser(); // SAXParser (Xerces)
myParser.setContentHandler(this);           
myParser.parse(fileName);      } catch (Exception e) {
     System.out.println("Erreur " + e);     }
}// End of constructor
public void startDocument() {
     System.out.println(" start to parse " );
} // startDocument()
public void endDocument() {
System.out.println(" End of Parse ");
} // endDocument()
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
     System.out.println(localName) ;
public void endElement(String namespaceURI, String localName, String qName) throws SAXException {           
}// Endelement()
public void characters(char ch[], int start, int length) {
} // endCharacters(char[],int,int);
public void processingInstruction(String target, String data) {
} // processingInstruction(String,String)
public void ignorableWhitespace(char ch[], int start, int length) {
          characters(ch, start, length);
} // ignorableWhitespace(char[],int,int);
public static void main(String args[]) {
String xmlFileName = "";
if (args.length == 0) {               
System.out.println("Usage::java XmlLeser path/xmlFilename");
System.exit(0);      } else {
xmlFileName = args[0];
XmlLeser pux = new XmlLeser(xmlFileName);
}// end main()
}//endClass

Answer 1

You need to pass your filename String as a parameter to your functionality. It depends how you're currently set up though. We can't really see the top of your call so it's difficult to determine what you are calling and we don't really know from where you're calling either.
If you're running standalone, then on launch of the application, you can feed in a file name as an argument that you can read in in String args[] in the main function and pass down to your XML splitter.
If you're a method in a class that's part of a bigger pile, you can feed the file name as a String to the method from wherever you call from if it makes sense architecturally.
You might also want to pass down a File object if that makes sense in your current code (i.e. if you're using your file for other purposes prior to the split, to avoid recreating closing/opening for no reason).
Depends what you're trying to do. If I put together a piece like this, I would probably create an <yourcurrentrootpackage>.xml.splitter package.
Also, on a side note, you're problem isn't really reading and writing XML in java, but seems more to be making your functionality generic so that any XML file can be split with your code.
Regards
JFM