servlet小练习：获取用户上一次访问的时间

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //防止乱码
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out=response.getWriter();
		//2.获取客户端所有的Cookie
		Cookie[] cookies =request.getCookies();
		//当Cookies为null的时候，说明可能是第一次访问
		for (int i = 0; cookies!=null&&i < cookies.length; i++) {
			if("LastVisitTime".equals(cookies[i].getName())){
				long time =Long.parseLong(cookies[i].getValue());
				out.write("你的上次访问时间是："+new Date(time).toLocaleString());
			}
		}
		//1.创建Cookie
		Cookie c=new Cookie("LastVisitTime",System.currentTimeMillis()+"");
		//设置失效时间为1小时
		c.setMaxAge(60*60);
		//将Cookie信息响应给客户端
		response.addCookie(c);
	}

protect