Java HTML/XML - 如何将JAXB对象封送到org.w3c.dom.Document

import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
@XmlRootElement
public class Main {

    private String bar;

    public String getBar() {
        return bar;
    }

    public void setBar(String bar) {
        this.bar = bar;
    }

    public static void main(String[] args) throws Exception {
        // Create the JAXBContext
        JAXBContext jc = JAXBContext.newInstance(Main.class);

        // Create the Object
        Main foo = new Main();
        foo.setBar("Hello World");

        // Create the Document
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document document = db.newDocument();

        // Marshal the Object to a Document
        Marshaller marshaller = jc.createMarshaller();
        marshaller.marshal(foo, document);

        // Output the Document
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer t = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        StreamResult result = new StreamResult(System.out);
        t.transform(source, result);
    }

}