jdom解析XML文件

     Reader reader = new StringReader(XXX.xml);
     InputSource is = new InputSource(reader);
     DocumentBuilderFactory factory =  DocumentBuilderFactory.newInstance();
     DocumentBuilder builder = factory.newDocumentBuilder();
     SAXBuilder build = new SAXBuilder();
     Document   doc = build.build(is);
     Element root=doc.getRootElement();
     java.util.List<Element> list = root.getChildren("attribute");
     Element rootelem=null;
     for (Element elem :list) {
     String name = elem.getAttributeValue("displayname");
      String value = elem.getValue();
      String before = elem.getChildText("before");
     oldvalue.put(name, before);
      if (before !=null) {
     String str = value.replace(before, "");
      newvalue.put(name, str);
      } else {
       newvalue.put(name, value);
         }
              }