Using SAX Implementation Provided in JDK 1.8

XML Tutorials - Herong's Tutorial Examples - Version 5.05, by Dr. Herong Yang

XML Tutorials - Herong's Tutorial Examples

∟SAX (Simple API for XML) Programming Interface

∟Using SAX Implementation Provided in JDK 1.8

This section provides a tutorial example on how to use the SAX interface included in JDK 1.8, 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 for the SAX interfaces:

/* SAXClassChecker.java
 - Copyright (c) 2014, 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 compile and run this sample program in JDK 1.8, you will get:

C:\herong\xml>java SAXClassChecker hello.xml
com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl@1db9742
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl@106d69c
org.xml.sax.helpers.DefaultHandler@52e922

Note that:

javax.xml.parsers.SAXParserFactory.newInstance() method is used to create a new factory instance using the factory implementation class, com.sun.org.apache.crimson.jaxp.SAXParserFactoryImpl.
javax.xml.parsers.SAXParserFactory.newSAXParser() method is used to create a new parser instance using the parser implementation class, com.sun.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 a 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 1.8.

Last update: 2014.

Table of Contents

About This Book

Introduction of XML (eXtensible Markup Language)

XML File Syntax

XML File Browsers

DOM (Document Object Model) Programming Interface

►SAX (Simple API for XML) Programming Interface

What Is SAX (Simple API for XML)?

►Using SAX Implementation Provided in JDK 1.8

SAX Content Handler Interface