Event Based XML Parsing SAX - Print content of link element

// Event Based XML Parsing – SAX

import javax.xml.parsers.*;

import org.xml.sax.*;

import org.xml.sax.helpers.DefaultHandler;

 

/** Helper class containing SAX event handler methods */

class PrintElementsHelper extends DefaultHandler

{

     boolean inLink = false;

     StringBuffer charData;

 

     PrintElementsHelper()

     {

          super();

     }

 

     public void startElement(String namespaceURI, String localName,        String qName, Attributes attr) throws SAXException

     {

          if (qName.equals("link"))

          {

              inLink = true;

              charData = new StringBuffer();

          }

          return;

     }

    

     public void characters(char chars[], int firstChar, int nChars)     throws SAXException

     {

          if (inLink)

          {

              charData.append(chars, firstChar, nChars);

          }

          return;

     }

    

     public void endElement(String namespaceURI, String localName, String qName) throws SAXException

     {

          if (qName.equals("link"))

          {

              System.out.println("Link data: " + charData.toString());

              inLink = false;

          }

          return;

     }

}

 

/** Count the number of link elements in an XML document */

class SAXPrintElements

{

     /** Source document */

     static String FEED_URL = "rss.xml";

     static public void main(String args[])

     {

          try

          {            

              SAXParserFactory saxFactory = SAXParserFactory.newInstance();

              XMLReader parser = saxFactory.newSAXParser().getXMLReader();

 

              parser.setContentHandler(new PrintElementsHelper());

              parser.parse(FEED_URL);

          }

          catch (SAXParseException spe)

          {

              System.err.println("Parse error at line " + spe.getLineNumber() + ", character " + spe.getColumnNumber());

              if (spe.getException() != null)

              {

                   spe.getException().printStackTrace();

              }

              else

              {

                   spe.printStackTrace();

              }

          }

          catch (SAXException se)

          {

              if (se.getException() != null)

              {

                   se.getException().printStackTrace();

              }

              else

              {

                   se.printStackTrace();

              }

          }

          catch (Exception e)

          {

              e.printStackTrace();

          }

          return;

     }

}