XML Tutorials - Herong's Tutorial Examples - v5.25, by Herong Yang
Converting DOM Document Objects to XML Files
This section provides a tutorial example on how to convert DOM document objects into XML files using the XML transform package provided in JDK.
Once you have a DOM document object in memory, for sure you want to know how to write it out into an XML file. One way to do this is to use the XML transform package offered in JDK.
The main class in the XML transform package is called Transformer, which can be used process XML from a variety of sources and write the transformation output to a variety of sinks.
Here is a Java program to illustrate how to use Transformer to convert a DOM document into a XML file:
/* DOMToXML.java * Copyright (c) 2002-2018 HerongYang.com. All Rights Reserved. */ import java.io.*; import javax.xml.parsers.*; import org.w3c.dom.*; import javax.xml.transform.*; import javax.xml.transform.dom.*; import javax.xml.transform.stream.*; class DOMToXML { public static void main(String[] args) { try { File x = new File(args[0]); DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); DocumentBuilder b = f.newDocumentBuilder(); Document d = b.newDocument(); Element r = d.createElement("dictionary"); d.appendChild(r); Element w = d.createElement("word"); r.appendChild(w); Element e = d.createElement("update"); w.appendChild(e); e.setAttribute("date","2014-12-24"); e = d.createElement("name"); w.appendChild(e); e.setAttribute("is_acronym","true"); e.appendChild(d.createTextNode("DTD")); e = d.createElement("definition"); w.appendChild(e); e.appendChild(d.createTextNode("Document Type Definition")); TransformerFactory tf = TransformerFactory.newInstance(); Transformer m = tf.newTransformer(); System.out.println(m.toString()); DOMSource source = new DOMSource(d); StreamResult result = new StreamResult(x); m.transform(source, result); } catch (ParserConfigurationException e) { System.out.println(e.toString()); } catch (TransformerConfigurationException e) { System.out.println(e.toString()); } catch (TransformerException e) { System.out.println(e.toString()); } } }
Run this program with JDK 10 and 1.8, you will get the following on the Java console window:
herong> java DOMToXML word.xml com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl@52e922
This tells us that the factory pickup an implementation of Transformer from the org.apache.xalan.transformer package.
word.xml, the XML file generated by the program, looks very good:
<?xml version="1.0" encoding="UTF-8"?> <dictionary><word><update date="2014-12-24"/> <name is_acronym="true">DTD</name> <definition>Document Type Definition</definition></word> </dictionary>
Note that entire root element is stored in a single line. It was split into multiple lines manually to be included in this book.
Table of Contents
Introduction of XML (eXtensible Markup Language)
►DOM (Document Object Model) Programming Interface
What Is DOM (Document Object Model)
Using DOM Implementation Provided in JDK
DOM Specifications and DOM Node Interface
DOMBrowser.java - DOM Interface Java 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
Validating an XML Document against the Specified DTD Document Type
XSD (XML Schema Definition) Introduction
Validating XML Documents Against Specified XML Schemas
XSL (Extensible Stylesheet Language) Introduction
XSLT (XSL Transformations) Introduction
XSLT Elements as Programming Statements
Control and Generate XML Element in the Result
PHP Extensions for XML Manipulation
Processing XML with Python Scripts
XML Tools Plugin for Notepad++
XML Plugin Packages for Atom Editor