Parsing XML with SAX
Package org.xml.sax Provides the classes and interfaces for the Simple API for XML (SAX) which is a component of the Java API for XML Processing. SAX, the Simple API for XML, is a standard interface for event-based XML parsing, developed collaboratively by the members of the XML-DEV mailing list, currently hosted by OASIS

The first step in parsing an XML document with SAX is to obtain a SAX parser.The code looks like this:

import javax.xml.parsers.*;

SAXParserFactory parserFactory = SAXParserFactory.newInstance();
parserFactory.setValidating(true);
parserFactory.setNamespaceAware(true);
SAXParser parser = parserFactory.newSAXParser();

The SAXParser class is a simple wrapper around the org.xml.sax.XMLReader class. Once you have obtained one, you can parse a document by simply calling one of the various parse() methods.

The following code shows a method that uses SAX to parse an XML file

 import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
import java.io.File;
public class SampleSAX {
public static void main(String[] args) {
ProductEventHandler handler= new ProductEventHandler();
try {
SAXParserFactory factory= SAXParserFactory.newInstance();
SAXParser parser= factory.newSAXParser();
File ourExample= new File("products.xml");
parser.parse( ourExample, handler);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}