Write XML File using STAX

Lets assume you would like to write the following simple XML file.

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <mode>1</mode>
    <unit>900</unit>
    <current>1</current>
    <interactive>1</interactive>
</config>

StaX does not provide functionality to format the XML file automatically. So you have to add end-of-lines and tab information to your XML file.

import java.io.FileOutputStream;

import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartDocument;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

public class StaxWriter {
    private String configFile;

    public void setFile(String configFile) {
        this.configFile = configFile;
    }

    public void saveConfig() throws Exception {
        // Create a XMLOutputFactory
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        // Create XMLEventWriter
        XMLEventWriter eventWriter = outputFactory
                .createXMLEventWriter(new FileOutputStream(configFile));
        // Create a EventFactory
        XMLEventFactory eventFactory = XMLEventFactory.newInstance();
        XMLEvent end = eventFactory.createDTD("\n");
        // Create and write Start Tag
        StartDocument startDocument = eventFactory.createStartDocument();
        eventWriter.add(startDocument);

        // Create config open tag
        StartElement configStartElement = eventFactory.createStartElement("",
                "", "config");
        eventWriter.add(configStartElement);
        eventWriter.add(end);
        // Write the different nodes
        createNode(eventWriter, "mode", "1");
        createNode(eventWriter, "unit", "901");
        createNode(eventWriter, "current", "0");
        createNode(eventWriter, "interactive", "0");

        eventWriter.add(eventFactory.createEndElement("", "", "config"));
        eventWriter.add(end);
        eventWriter.add(eventFactory.createEndDocument());
        eventWriter.close();
    }

    private void createNode(XMLEventWriter eventWriter, String name,
            String value) throws XMLStreamException {

        XMLEventFactory eventFactory = XMLEventFactory.newInstance();
        XMLEvent end = eventFactory.createDTD("\n");
        XMLEvent tab = eventFactory.createDTD("\t");
        // Create Start node
        StartElement sElement = eventFactory.createStartElement("", "", name);
        eventWriter.add(tab);
        eventWriter.add(sElement);
        // Create Content
        Characters characters = eventFactory.createCharacters(value);
        eventWriter.add(characters);
        // Create End node
        EndElement eElement = eventFactory.createEndElement("", "", name);
        eventWriter.add(eElement);
        eventWriter.add(end);

    }

}

And a little test.

public class TestWrite {

    public static void main(String[] args) {
        StaxWriter configFile = new StaxWriter();
        configFile.setFile("config2.xml");
        try {
            configFile.saveConfig();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}