显示用户上次访问时间

/**
 * @Author:gaoyuan
 * @Description:显示用户上次访问时间
 * @DateTime:2021/3/2 20:36
 **/
@WebServlet("/last")
public class LastLoginServlet extends HttpServlet {
    
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //cookie的值必须是字符串，并且里面不能有空格
        //获取cookie请求头，cookie：key=value；key=value
        //也就是对于获取cookie请求头的封装,cookies数组
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
    
    
            for (Cookie cookie : cookies)
                //get the cookie name
                if ("lastLogin".equals(cookie.getName())) {
    
    
                    //et the cookie value
                    String value = cookie.getValue();
                    //Long.parseLong将一个字符串转换成数字的
                    long time = Long.parseLong(value);
                    Date date = new Date(time);
                    response.getWriter().println(date);

                }
        }
//创建cookie键值对
        Cookie cookie = new Cookie("lastLogin", System.currentTimeMillis() + "");
        //此行代码就是对于设置Set-Cookie；key=value的封装
        response.addCookie(cookie);
    }
}

结果：