∟DOMToXML.java - Converting DOM Documents to XML Files
This section provides a tutorial example on how to write a program to convert a DOM document object into an XML file using the default XML transformer, org.apache.xalan.transformer, provided in the JDK.
Once you have a DOM document 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 J2SDK.
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 program to illustrate how to use Transformer to convert a DOM document into
a XML file:
/**
* DOMToXML.java
* Copyright (c) 2002 by Dr. Herong Yang
*/
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","2002-12-24");
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 "java DOMToXML word.xml, you will get the following on
the Java console window:
