public String modifyPassWord() throws Exception {
    UserbaseinfoDAO userDao = (UserbaseinfoDAO) DAOFactory.getIUserbaseinfoDAOInstance();
    String useroldPassword = request.getParameter("myoldPassword");
    String usernewPassword = request.getParameter("mynewPassword");
    String userId = (String) ServletActionContext.getRequest().getSession().getAttribute("userId");
    String DaoUserPass = userDao.getUserAllMsgById(Integer.parseInt(userId)).getUserPassword();
    boolean Istrue = true;
    boolean Isrepeat = true;
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    byte[] md = md5.digest(useroldPassword.getBytes());
    useroldPassword = new String(md);
    byte[] md1 = md5.digest(usernewPassword.getBytes());
    usernewPassword = new String(md1);

    // 如果旧密码与数据库密码不匹配,提示用户错误消息
    if (!DaoUserPass.equals(useroldPassword)) {
      Istrue = false;
    } else {
      // 比较新密码与原始密码是否一致,如果一致,提示用户新密码与旧密码不能一致
      if (!DaoUserPass.equals(usernewPassword) && usernewPassword != "") { // 如果不一致,修改数据库中的密码
        Isrepeat = false; // 没有重复
        System.out.println("用户id=" + userId + "用户新密码=" + usernewPassword);
        DAOFactory.getIUserbaseinfoDAOInstance()
            .updatePassword(Integer.parseInt(userId), usernewPassword);
      }
    }
    System.out.println(Istrue + "            " + Isrepeat);
    response.getWriter().print("[{\"isTrue\":" + Istrue + "},{\"isRepeat\":" + Isrepeat + "}]");
    return null;
  }
 public String updateMsgMail() {
   int userId = Integer.parseInt((String) request.getSession().getAttribute("userId"));
   UserbaseinfoDAO userDAO = (UserbaseinfoDAO) DAOFactory.getIUserbaseinfoDAOInstance();
   userDAO.updateUserMsgMail(user, userId);
   try {
     showInformation();
   } catch (IOException e) {
     e.printStackTrace();
   }
   return "toUpdate";
 }