public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");

    //		PrintWriter out = response.getWriter(); // 再拿到输出对象
    response.setContentType("text/html;charset=UTF-8");

    String flag = request.getParameter("flag");

    if (flag == null) {
      //			flag=request.getAttribute("flag").toString();
    }
    System.out.println("flag:" + flag);
    if (("queryOrder").equals(flag)) {
      List<OrderBean> beans = orderBeanManager.queryOrder(request, response);
      System.out.println("order.size:" + beans.size());
      request.setAttribute("orderBeans", beans);
      request.getRequestDispatcher("/order.jsp").forward(request, response);
      return;
    } else if ("queryFood".equals(flag)) {
      List<FoodBean> foodBeans = orderBeanManager.queryFood(request, response);
      request.setAttribute("foodBeans", foodBeans);
      request.getRequestDispatcher("/food_new.jsp").forward(request, response);
      return;

    } else if ("updateFood".equals(flag)) {
      System.out.println(request.getParameter("picture"));
      FileManager f = new FileManager();
      f.upload(request, response);
      ;
    } else if ("updateOrder".equals(flag)) {
      int id = Integer.parseInt(request.getParameter("id"));
      orderBeanManager.updateOrder(id);
      List<OrderBean> beans = orderBeanManager.queryOrder(request, response);
      request.setAttribute("orderBeans", beans);
      request.getRequestDispatcher("/order.jsp").forward(request, response);
      return;
    } else if ("queryUser".equals(flag)) {
      List<UserBean> userBeans = orderBeanManager.queryUser();
      request.setAttribute("userBeans", userBeans);
      request.getRequestDispatcher("/user.jsp").forward(request, response);

    } else {
      FileManager f = new FileManager();
      f.upload(request, response);

      List<FoodBean> foodBeans = orderBeanManager.queryFood(request, response);
      request.setAttribute("foodBeans", foodBeans);
      request.getRequestDispatcher("/food_new.jsp").forward(request, response);
      return;
    }
  }
  public void init() throws ServletException {

    orderBeanManager = OrderBeanManager.getInstance();
    webPath = getServletContext().getRealPath("/");
  }