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<?xml version="1.0" encoding="utf-8"?>
<root>
  <child ID="1"> old </child>
  <child ID="2"> old </child>
</root>
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<?xml version="1.0" encoding="utf-8"?>
<root>
  <child ID="1"> old </child>
  <child ID="3"> new </child> -->ÕâÊÇвåÈëµÄµÄ½Úµã
  <child ID="2"> old </child>
</root>
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SAXReader reader = new SAXReader(); 
  Document doc = reader.read("conf/student.xml"); 
  Element root = doc.getRootElement(); 
  Element zhangsanNode = (Element) root.selectSingleNode(path); 
  Element cloneE = (Element) zhangsanNode.clone(); 
  cloneE.element("age").setText(Integer.parseInt(cloneE.elementText("age"))+1+""); 
  Element parent = zhangsanNode.getParent(); 
  parent.elements().add(2, cloneE);