Archived: Using SAX Implementation Provided in JDK 1.4

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∟Archived: Using SAX Implementation Provided in JDK 1.4

This section provides a tutorial example on how to use the SAX interface included in JDK 1.4, which actually uses SAX implementation provided by the org.apache.crimson package.

I have a simple program here, SAXClassChecker.java, to show what are the implementation classes provided JDK 1.4 for the SAX interfaces:

/* SAXClassChecker.java
 * Copyright (c) 2002-2018 HerongYang.com. All Rights Reserved.
 */
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXException;
class SAXClassChecker {
   public static void main(String[] args) {
      try {
         File x = new File(args[0]);
         SAXParserFactory f = SAXParserFactory.newInstance();
         System.out.println(f.toString());
         SAXParser p = f.newSAXParser();
         System.out.println(p.toString());
         DefaultHandler h = new DefaultHandler();
         System.out.println(h.toString());
         p.parse(x,h);
      } catch (ParserConfigurationException e) {
         System.out.println(e.toString());
      } catch (SAXException e) {
         System.out.println(e.toString());
      } catch (IOException e) {
         System.out.println(e.toString());
      }
   }
}

If you run this sample program, you will get:

herong> java SAXClassChecker hello.xml

org.apache.crimson.jaxp.SAXParserFactoryImpl@1c78e57
org.apache.crimson.jaxp.SAXParserImpl@1e63e3d
org.xml.sax.helpers.DefaultHandler@1be2d65

Note that:

javax.xml.parsers.SAXParserFactory.newInstance() method is used to create a new factory instance using the factory implementation class, org.apache.crimson.jaxp.SAXParserFactoryImpl.
javax.xml.parsers.SAXParserFactory.newSAXParser() method is used to create a new parser instance using the parser implementation class, org.apache.crimson.jaxp.SAXParserImpl.
javax.xml.parsers.SAXParser.parse() method is used to invoke the parsing process. It requires two parameters, a File object representing the XML file, and an parsing event handler object.
org.xml.sax.helpers.DefaultHandler is dummy handler, which handles all the events fired by the parser, but does nothing. This is why we are getting nothing from the XML file when running this program.