Cookie实战

public class Cookie01 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");

        PrintWriter out = resp.getWriter();

        // 从客户端获取cookie
        Cookie[] cookies = req.getCookies();

        // 判断cookie是否为空
        if (cookies != null) {
            for (int i = 0; i < cookies.length; i++) {
                Cookie cookie = cookies[i];
                // 获得cookie的名字
                if (cookie.getName().equals("lastLoginTime")) {
                    // 获取cookie的值
                    Date date = new Date(Long.parseLong(cookie.getValue()));
                    out.print(date.toLocaleString());
                }

            }
        } else {
            out.print("这是你第一次访问网站。");
        }

        // 服务器给客户端响应一个cookie
        Cookie cookie = new Cookie("lastLoginTime", System.currentTimeMillis() + "");

        // 给cookie设置存活时间
        cookie.setMaxAge(24*60*60);

        resp.addCookie(cookie);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}