Cookie案例-显示用户的上次访问时间代码实现

1 案例分析

2 Java实现代码

public class LastAccessTimeServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws Exception {
        
        //Response 乱码问题的解决
        response.setContentType("text/html;charset=UTF-8");
        
        //获得当前时间
        Date date=new Date();
        SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String currentTime=format.format(date);
        
        //1 创建cookie记录最新的当前访问时间
        Cookie cookie=new Cookie("lastAccessTime", currentTime);
        cookie.setMaxAge(60*60);
        response.addCookie(cookie);
        //2 获得客户端携带的cookie----lastAccessTime
        String lastAccessTime=null;
        Cookie[] cookies=request.getCookies();
        if(cookies!=null){
            for (Cookie coo : cookies) {
                if ("lastAccessTime".equals(coo.getName())) {
                    lastAccessTime=coo.getValue();
                }
            }
        }
        //3判断是第几次访问
        if (lastAccessTime==null) {
            response.getWriter().write("您是第一次访问");
        } else {
            response.getWriter().write("您上次访问时间是："+lastAccessTime);
        }
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception {
        doGet(request, response);
    }
}