[移动开发]cookie

通过设置cookie来记录上次访问时间

public class cookie  extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=UTF-8");
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");//保证输出到页面的不是乱码
        Cookie[] cookies = req.getCookies();
        if(cookies!=null){
            resp.getWriter().write("你上次的访问时间是：");
            for (int i = 0; i <cookies.length ; i++) {
                Cookie cookie=cookies[i];//通过遍历将cookie转化为字符串
                if (cookie.getName().equals("lastLoginTime")){
                    long lastLoginTime = Long.parseLong(cookie.getValue());
                    Date date = new Date(lastLoginTime);
                    resp.getWriter().write(date.toString());
                }
            }
        }else {
            resp.getWriter().write("这是你第一次访问本站");
        }
        Cookie cookie=new Cookie("lastLoginTime",System.currentTimeMillis()+"");//设置cookie名与cookie值
        cookie.setMaxAge(24*60*60);
        resp.addCookie(cookie);
    }

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

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