[JSP] 쿠키 사용하기

Cookie[] cookies = req.getCookies();

		String num_ = req.getParameter("num");
		int y_num = Integer.parseInt(req.getParameter("num"));
		String cal = req.getParameter("cal");
		String cal_ = "";

		int x_num = 0;
		int result = 0;
		if (cal.equals("=")) {
			for (Cookie c : cookies) {

				if (c.getName().equals("v"))
					x_num = Integer.parseInt(c.getValue());
				if (c.getName().equals("cc")) {
					if (c.getValue().equals("+")) {
						result = x_num + y_num;
						out.println(result);
					} else {
						result = x_num - y_num;
						out.println(result);
					}
				}
			}
		} else {
			Cookie num_cookie = new Cookie("v", num_);
			res.addCookie(num_cookie);
			Cookie cal_cookie = new Cookie("cc", cal);
			res.addCookie(cal_cookie);