gwt解析xml

import com.google.gwt.xml.client.Document;
import com.google.gwt.xml.client.Node;
import com.google.gwt.xml.client.NodeList;
import com.google.gwt.xml.client.XMLParser;

private void parseMessage(String messageXml) {
  try {
    // parse the XML document into a DOM
    Document messageDom = XMLParser.parse(messageXml);

    // find the sender's display name in an attribute of the  tag
    Node fromNode = messageDom.getElementsByTagName("from").item(0);
    String from = ((Element)fromNode).getAttribute("displayName");
    fromLabel.setText(from);

    // get the subject using Node's getNodeValue() function
    String subject = messageDom.getElementsByTagName("subject").item(0).getFirstChild().getNodeValue();
    subjectLabel.setText(subject);

    // get the message body by explicitly casting to a Text node
    Text bodyNode = (Text)messageDom.getElementsByTagName("body").item(0).getFirstChild();
    String body = bodyNode.getData();
    bodyLabel.setText(body);

  } catch (DOMException e) {
    Window.alert("Could not parse XML document.");
  }
}