使用dom4j解析xml字符串

public class GetStandarDocs{
 
 //private static String menuPath = File.separator+"menu_XML.xml";
 
 private static String fileRealPath = File.separator+"standardPDF"+File.separator;
 
 private static Logger log = Logger.getLogger(GetStandarDocs.class);
  
 public static Document spellStandarDocsXML(String file,List<StandarDocs> standarDocsList) throws Exception{
  log.info("-----------------------spellStandarDocsXML Start------------------------------------");
  if(file == null) return null;
  Document document = null;
  try{//这里使用DocumentHelper来解析传过来的字符串

   //SAXReader read = new SAXReader();
  //document = read.read(file);此时file为文件或者文件路径
  document = DocumentHelper.parseText(file);
  Element root = document.getRootElement();
  List<Element> elementList = root.elements();
  for(Element treeElement : elementList){
   root.remove(treeElement);
  }
  List<StandarDocs> standarDocsList1 = new ArrayList<StandarDocs>();
  List<StandarDocs> standarDocsList2 = new ArrayList<StandarDocs>();
  for(StandarDocs standarDocs : standarDocsList){
   String lv = standarDocs.getLv();
   if("1".equals(lv)){
    standarDocsList1.add(standarDocs);
   }else{
    standarDocsList2.add(standarDocs);
   }
  }
  for(StandarDocs standarDocs1:standarDocsList1){
   Element treeElement = root.addElement("tree");
   treeElement.addAttribute("id", changeEmpety(standarDocs1.getId()));
   treeElement.addAttribute("lv", changeEmpety(standarDocs1.getLv()));
   Element textElement = treeElement.addElement("text");
   textElement.setText(changeEmpety(standarDocs1.getName()));
   Element targetElement = treeElement.addElement("target");
   targetElement.setText("Rmain");
   Element titleElement = treeElement.addElement("title");
   titleElement.setText(changeEmpety(standarDocs1.getTitle()));
   Element linkElement = treeElement.addElement("link");
   linkElement.setText(URLEncoding(changeEmpety(standarDocs1.getLink())));
   for(StandarDocs standarDocs2:standarDocsList2){
    String parentid = standarDocs2.getParentid();
    if(parentid.equals(changeEmpety(standarDocs1.getId()))){
     Element subTreeElement = treeElement.addElement("tree");
     subTreeElement.addAttribute("id", changeEmpety(standarDocs2.getId()));
     subTreeElement.addAttribute("lv", changeEmpety(standarDocs2.getLv()));
     Element subtextElement = subTreeElement.addElement("text");
     subtextElement.setText(changeEmpety(standarDocs2.getName()));
     Element subtargetElement = subTreeElement.addElement("target");
     subtargetElement.setText("Rmain");
     Element subtitleElement = subTreeElement.addElement("title");
     subtitleElement.setText(changeEmpety(standarDocs2.getTitle()));
     Element sublinkElement = subTreeElement.addElement("link");
     sublinkElement.setText(URLEncoding(changeEmpety(standarDocs2.getLink())));
    }
   }
  }
  }catch(Exception e){
   e.printStackTrace();
  }
  log.info("-----------------------spellStandarDocsXML End------------------------------------");
  return document;
 }
 
 private static String URLEncoding(String changeEmpety) throws UnsupportedEncodingException {
  // TODO Auto-generated method stub 
  return URLEncoder.encode(changeEmpety,"UTF-8");
 }

 public static void deleteFile(String name,String filePath){
  log.info("-----------------------RemoveStandarDocsAction Start------------------------------------");
  try{
   if(filePath!=null){
    filePath = filePath + fileRealPath + name;
   }else{
    return;
   }
   log.info("-----------------------filePath:"+filePath+"------------------------------------");
   File file = new File(filePath);
   if(file.exists()) file.delete(); 
  }catch(Exception e){
   e.printStackTrace();
  }
  log.info("-----------------------RemoveStandarDocsAction End------------------------------------");
 }
 
 private static String changeEmpety(String str){
  if(str==null){
   str="";
  }
  return str;
 }
}