Java HTML/XML - 如何使用XMLEventWriter创建XML文档

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.events.XMLEvent;

public class Main {

  public static void main(String[] args) throws Exception {
    XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
    XMLEventFactory eventFactory = XMLEventFactory.newInstance();
    XMLEventWriter writer = outputFactory.createXMLEventWriter(System.out);

    writer.add(eventFactory.createStartDocument("UTF-8", "1.0"));
    writer.add(eventFactory.createStartElement(new QName("p"), null, null));
    XMLEvent sampleElement = eventFactory.createStartElement("", null, "s",
        null, null);
    writer.add(sampleElement);
    writer.add(eventFactory.createEndElement("", null, "s"));
    writer.add(sampleElement);
    writer.add(eventFactory.createEndDocument());
    writer.flush();
  }

}