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 by Dr. Herong Yang. http://www.herongyang.com/
*/
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());
}
}
}
javax.xml.parsers.SAXParserFactory.newInstance() method is used to
create a new fatory 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.
Notes and sample codes in this section are based on JDK 1.4.1_01.