DOMBrowser.java - DOM Interface Java Example

This section provides a tutorial example on how to parse an XML file and print it back in a tree format using DOM interface in Java - JDK 1.8.

The following Java program illustrates how an XML file can be parsed into a DOM document tree, and how "get" methods of Node interface can be used to browse the tree:

/* DOMBrowser.java
 - Copyright (c) 2014, HerongYang.com, All Rights Reserved.
 */
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
class DOMBrowser {
   public static void main(String[] args) {
      try {
         File x = new File(args[0]);
         DocumentBuilderFactory f
            = DocumentBuilderFactory.newInstance();
         DocumentBuilder b = f.newDocumentBuilder();
         Document d = b.parse(x);
         printNode(d, "");
      } catch (ParserConfigurationException e) {
         System.out.println(e.toString());      
      } catch (SAXException e) {
         System.out.println(e.toString());      
      } catch (IOException e) {
         System.out.println(e.toString());      
      }
   }
   static void printNode(Node n, String p) {
      NodeList l = n.getChildNodes();
      NamedNodeMap m = n.getAttributes();
      int ml = -1;
      if (m!=null) ml = m.getLength(); 
      System.out.println(p+n.getNodeName()+": "+n.getNodeType()+", "
         +l.getLength()+", "+ml+", "+n.getNodeValue());
      for (int i=0; i<ml; i++) {
         Node c = m.item(i);
         printNode(c,p+" |-");
      }
      for (int i=0; i<l.getLength(); i++) {
         Node c = l.item(i);
         printNode(c,p+" ");
      }
   }
}

Now let's use this program to browse my first XML file, hello.xml:

<?xml version="1.0"?>
<p>Hello world!</p>

You will get the following output:

C:\herong\xml>java DOMBrowser hello.xml 

#document: 9, 1, -1, null
 p: 1, 1, 0, null
  #text: 3, 0, -1, Hello world!

Here is how to read the output:

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

 What Is DOM (Document Object Model)?

 Using DOM Implementation Provided in JDK 1.8

 DOM Specifications and DOM Node Interface

DOMBrowser.java - DOM Interface Java Example

 XML DOM Node Tree Example

 Building a New DOM Document Object

 Converting DOM Document Objects to XML Files

 SAX (Simple API for XML) Programming Interface

 DTD (Document Type Definition) Introduction

 Syntaxes of DTD Statements

 Validating an XML Document against the Specified DTD Document Type

 XSD (XML Schema Definition) Introduction

 Syntaxes of XSD Statements

 Validating XML Documents Against Specified XML Schemas

 XSL (Extensible Stylesheet Language) Introduction

 XSLT (XSL Transformations) Introduction

 Java Implementation of XSLT

 XPath (XML Path) Language

 XSLT Elements as Programming Statements

 Control and Generate XML Element in the Result

 XML Notepad - XML Editor

 XML Tools Plugin for Notepad++

 XML 1.1 Changes and Parsing Examples

 Outdated Tutorials

 References

 PDF Printing Version