public class ShowDocument {
 public static void main(String args[]) {
  File docFile = new File("employees.xml");
  Document doc = null;
  try {
   DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
   DocumentBuilder db = dbf.newDocumentBuilder();
   doc = db.parse(docFile);
  } catch (Exception e) {
   System.out.print("Problem parsing the file.");
  }
  DOMImplementation domimpl = doc.getImplementation();
  if (domimpl.hasFeature("Traversal","2.0")) {
   Node root = doc.getDocumentElement();
   int whattoshow = NodeFilter.SHOW_ALL;
   NodeFilter nodefilter = null;
   boolean expandreferences = false;
   DocumentTraversal traversal = (DocumentTraversal) doc;
   TreeWalker walker = traversal.createTreeWalker(root, whattoshow,
     nodefilter, expandreferences);
   Node thisNode = null;
   thisNode = walker.nextNode();
   while (thisNode != null) {
    if (thisNode.getNodeType() == thisNode.ELEMENT_NODE) {
     System.out.print(thisNode.getNodeName() + " ");
     Element thisElement = (Element) thisNode;
     NamedNodeMap attributes = thisElement.getAttributes();
     System.out.print("(");
     for (int i = 0; i < attributes.getLength(); i++) {
      System.out.print(attributes.item(i).getNodeName()
        + "=\"" + attributes.item(i).getNodeValue()
        + "\" ");
     }
     System.out.print(") : ");
    } else if (thisNode.getNodeType() == thisNode.TEXT_NODE) {
     System.out.print(thisNode.getNodeValue());
    }
    thisNode = walker.nextNode();
   }
  } else {
   System.out.println("The Traversal module isn't supported.");
  }
 }
}

系统输出：The Traversal module isn't supported.
employees.xml与class在同级目录中
是不是 环境的问题呀？
谢谢

屏幕输出如下：
E:\CodeAndFile\XML\DOMSAX>java ShowDocument

  person (contr="false" id="Big.Boss" ) :
    name () : family () : Boss given () : Big
    email () : chief@foo.com
    link (subordinates="one.worker two.worker three.worker four.worker five.work
er" ) :

  person (contr="false" id="one.worker" ) :
    name () : family () : Worker given () : One
    email () : one@foo.com
    link (manager="Big.Boss" ) :

  person (contr="false" id="two.worker" ) :
    name () : family () : Worker given () : Two
    email () : two@foo.com
    link (manager="Big.Boss" ) :

  person (contr="false" id="three.worker" ) :
    name () : family () : Worker given () : Three
    email () : three@foo.com
    link (manager="Big.Boss" ) :

  person (contr="false" id="four.worker" ) :
    name () : family () : Worker given () : Four
    email () : four@foo.com
    link (manager="Big.Boss" ) :

  person (contr="false" id="five.worker" ) :
    name () : family () : Worker given () : Five
    email () : five@foo.com
    link (manager="Big.Boss" ) :

E:\CodeAndFile\XML\DOMSAX>

感谢以上各层的解答，谢谢！！！