如何在使用EventReader迭代事件时获取事件的位置？

import javax.xml.stream.*;
import javax.xml.stream.events.*;

public class EventReaderExample {
    public static void main(String[] args) throws XMLStreamException {
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLEventReader reader = factory.createXMLEventReader(
                EventReaderExample.class.getResourceAsStream("example.xml"));

        while (reader.hasNext()) {
            XMLEvent event = reader.nextEvent();

            if (event.isStartElement() || event.isEndElement()) {
                Location location = event.getLocation();
                int lineNumber = location.getLineNumber();
                int columnNumber = location.getColumnNumber();
                String systemId = location.getSystemId();

                System.out.println("Event position: line " + lineNumber +
                        ", column " + columnNumber + ", system ID " + systemId);
            }
        }

        reader.close();
    }
}