public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  AddStudentForm addStudentForm = (AddStudentForm) form;
  
  PersonDAO personDAO = new PersonDAO();
  Student student = new Student();
  String birth = addStudentForm.getBirthdayYear() + "-"+ addStudentForm.getBirthdayMonth() +
                      "-"+   addStudentForm.getBirhthdayDay();           

  student.setUsername(addStudentForm.getUsername());
  student.setPassword(addStudentForm.getPassword());
  student.setSex(addStudentForm.getSex());

  try {
   SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");//固定的格式
   Date date = sd.parse(birth);//将字符转化为DATE类型
   student.setBirthday(date);
  } catch (ParseException e) {

   System.out.println("插入失败插入失败插入失败插入失败插入失败");
  }

  student.setGrade(addStudentForm.getGragde());
  personDAO.insertStudentOrTeacher(student);
  return mapping.findForward("ok");
 }



/*************************************************************************/



SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date date=new Date();
     String toLocaleString = date.toLocaleString();
 article.setSavetime(sd.parse(toLocaleString));


/*************************************************
SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date date=new Date();
String dd=sd.format(date);