Cookie案例-显示用户的上次访问时间代码实现

Posted 2020-10-21 leeoo

1 案例分析

2 Java实现代码

public class LastAccessTimeServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //获得当前时间
        Date date = new Date();
　　　　　//将日期格式化一下
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String currentTime = format.format(date);
        
        //1、创建Cookie 记录当前的最新的访问时间
        Cookie cookie = new Cookie("lastAccessTime",currentTime);
        cookie.setMaxAge(60*10*500);
        response.addCookie(cookie);
        
        //2、获得客户端携带cookie ---- lastAccessTime
        String lastAccessTime = null;
        Cookie[] cookies = request.getCookies();
        if(cookies!=null){
            for(Cookie coo : cookies){
                if("lastAccessTime".equals(coo.getName())){
                    lastAccessTime = coo.getValue();
                }
            }
        }
        
        response.setContentType("text/html;charset=UTF-8");
        if(lastAccessTime==null){
            response.getWriter().write("您是第一次访问");
        }else{
            response.getWriter().write("您上次的访问的时间是："+lastAccessTime);
        }
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}