如何从字符串中加载XML中的org.w3c.dom.Document？

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;

public class XmlFromString {
    public static void main(String[] args) {
        String xmlString = "<root><child>Text</child></root>";
        try {
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader(xmlString));
            Document doc = dBuilder.parse(is);
            doc.getDocumentElement().normalize();
            System.out.println("Root element: " + doc.getDocumentElement().getNodeName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}