DOM provides many handy classes to create XML file easily. Firstly, you have to create a Document with DocumentBuilder class, define all the XML content – node, attribute with Element class. In last, use Transformer class to output the entire XML content to stream output, typically a File.

In this tutorial, we show you how to use DOM XML parser to create a XML file.

DOM Parser Example

At the end of the example, following XML file named “file.xml” will be created.


<?xml version="1.0" encoding="UTF-8" standalone="no" ?> 
<company>
	<staff id="1">
		<firstname>yong</firstname>
		<lastname>mook kim</lastname>
		<nickname>mkyong</nickname>
		<salary>100000</salary>
	</staff>
</company>

File : WriteXMLFile.java – Java class to create a XML file.


package com.mkyong.core;

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class WriteXMLFile {

	public static void main(String argv[]) {

	  try {

		DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

		// root elements
		Document doc = docBuilder.newDocument();
		Element rootElement = doc.createElement("company");
		doc.appendChild(rootElement);

		// staff elements
		Element staff = doc.createElement("Staff");
		rootElement.appendChild(staff);

		// set attribute to staff element
		Attr attr = doc.createAttribute("id");
		attr.setValue("1");
		staff.setAttributeNode(attr);

		// shorten way
		// staff.setAttribute("id", "1");

		// firstname elements
		Element firstname = doc.createElement("firstname");
		firstname.appendChild(doc.createTextNode("yong"));
		staff.appendChild(firstname);

		// lastname elements
		Element lastname = doc.createElement("lastname");
		lastname.appendChild(doc.createTextNode("mook kim"));
		staff.appendChild(lastname);

		// nickname elements
		Element nickname = doc.createElement("nickname");
		nickname.appendChild(doc.createTextNode("mkyong"));
		staff.appendChild(nickname);

		// salary elements
		Element salary = doc.createElement("salary");
		salary.appendChild(doc.createTextNode("100000"));
		staff.appendChild(salary);

		// write the content into xml file
		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		Transformer transformer = transformerFactory.newTransformer();
		DOMSource source = new DOMSource(doc);
		StreamResult result = new StreamResult(new File("C:\\file.xml"));

		// Output to console for testing
		// StreamResult result = new StreamResult(System.out);

		transformer.transform(source, result);

		System.out.println("File saved!");

	  } catch (ParserConfigurationException pce) {
		pce.printStackTrace();
	  } catch (TransformerException tfe) {
		tfe.printStackTrace();
	  }
	}
}

A new XML file is created in “C:\\file.xml“, with default UTF-8 encoded.

Note
For debugging, you can change the StreamResult to output the XML content to your console.


StreamResult result =  new StreamResult(System.out);
transformer.transform(source, result);