protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		String action_flag = request.getParameter("action_flag");
		if (action_flag.equals("userlist")) {
			listUser(request, response);
		} else if (action_flag.equals("searchuser")) {
			searchUser(request, response);
		} else if (action_flag.equals("changeuser")) {
			changeUser(request, response);
		} else if (action_flag.equals("productlist")) {
			listProduct(request, response);
		} else if (action_flag.equals("searchpro")) {
			searchPro(request, response);
		} else if (action_flag.equals("password")) {
			changePswd(request, response);
		}
	}