public String getTestObjectTreeStr(TestObject to, String id, String value) {

  if(to == null){
   return "null";
  }
  
  StringBuffer xpath = new StringBuffer();
  addPropertyToCatch(to, id, value, xpath);
  this.getTestObjectProperty(to, xpath);

  String path = xpath.toString();
  String rs = parseXpath(path);
  return rs += "[1]";
 }

public void writeXpathToFile(String ObjectID, String xpath, String filename) {
  File file = new File(filename);

  try {
   if (this.isObjectXpathExists(ObjectID, file)) {
    this.updataXpathbyObjectID(ObjectID, xpath, filename);
   } else {

    BufferedWriter writer = new BufferedWriter(new FileWriter(file,
      true));

    writer.write(ObjectID + "=" + xpath);
    writer.write("\r\n");

    writer.flush();
    writer.close();
   }

  } catch (IOException e) {
   // TODO 自动生成 catch 块
   e.printStackTrace();
  }

  String rootStr = this.getFirstRootStr(xpath);
  String rootStr_ID = ObjectID + "_head";
  try {
   if (this.isObjectXpathExists(rootStr_ID, file)) {
    return;
   } else {

    BufferedWriter writer = new BufferedWriter(new FileWriter(file,
      true));
    writer.write(rootStr_ID + "=" + rootStr);
    writer.write("\r\n");
    writer.flush();
    writer.close();

   }

  } catch (IOException e) {
   // TODO 自动生成 catch 块
   e.printStackTrace();
  }
  file = null;
 }