@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String id = req.getParameter("id");
		String password = req.getParameter("password");

		if (id == null || id.length() == 0 || password == null || password.length() == 0) {
			resp.sendError(400, "incomplete parameter");
			return;
		}

		AccountService service = (AccountService) context.getBean("accountService");

		try {
			service.login(id, password);
			resp.getWriter().print("Login Successful!");
		} catch (AccountServiceException e) {
			resp.sendError(400, e.getMessage());
		}
	}