无法在Stax中使用XMLEventReader检查XML中的CDATA

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

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

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

            if (event.isCharacters()) {
                Characters characters = event.asCharacters();
                if (characters.isCData()) {
                    String cdata = characters.getData();
                    System.out.println("CDATA content: " + cdata);
                }
            }
        }

        reader.close();
    }
}