Outdated: Using DOM Implementation Provided in JDK 1.4

XML Tutorials - Herong's Tutorial Examples

∟Outdated: Using DOM Implementation Provided in JDK 1.4

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

Here is a program to show how different packages are used together to parse an XML file into a DOM document object:

/* DOMParser.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
class DOMParser {
   public static void main(String[] args) {
      try {
         File x = new File(args[0]);
         DocumentBuilderFactory f
            = DocumentBuilderFactory.newInstance();
         System.out.println(f.toString());
         DocumentBuilder b = f.newDocumentBuilder();
         System.out.println(b.toString());
         Document d = b.parse(x);
         System.out.println(d.toString());
         DOMImplementation i = d.getImplementation();
         System.out.println(i.toString());
      } 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:

C:\herong>java DOMParser hello.xml

org.apache.crimson.jaxp.DocumentBuilderFactoryImpl@1c78e57
org.apache.crimson.jaxp.DocumentBuilderImpl@13e8d89
org.apache.crimson.tree.XmlDocument@1cfb549
org.apache.crimson.tree.DOMImplementationImpl@1820dda

Note that:

javax.xml.parsers.DocumentBuilderFactory.newInstance() method is used to create a new factory instance using a factory implementation from the org.apache.crimson.jaxp.* package.
javax.xml.parsers.DocumentBuilder.newDocumentBuilder() method is used to create a new builder instance using a builder implementation from org.apache.crimson.jaxp.* package.
javax.xml.parsers.DocumentBuilder.parse() method is used to parse the XML file into an org.w3c.dom.Document object implemented with org.apache.crimson.tree.XmlDocument class.