循循渐进07篇 maven Cookie代码

//保存用户上一次访问的时间
public class CookieDeom01 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //服务器，告诉你，你来的时间，把这个时间封装成一个信件，你下次来，我就你知道你来了

        //解决中文乱码
        req.setCharacterEncoding("gbk");
        resp.setCharacterEncoding("gbk");

        PrintWriter out = resp.getWriter();
        //cookie,服务器从客户端获取
        Cookie[] cookies = req.getCookies();//这里返回数组，说明cookie可能存在多个
           //判断cookie是否存在
        if(cookies!=null){
            out.write("上一次你访问的时间是：");
            //两种for循环遍历
//            for (Cookie cookie:cookies) {
//
//            }
            for (int i = 0; i <cookies.length; i++) {
                Cookie cookie = cookies[i];
                //获取cookie的名字
                if(cookie.getName().equals("lastLoginTime")){
//                    cookie.getValue();//获取cookie的值
                    long lastLoginTime = Long.parseLong(cookie.getValue());//将字符串变成时间戳
                    Date date = new Date(lastLoginTime);
                    out.write(date.toLocaleString());

                }


            }

        }else {
              out.write("这是您第一次访问本站");
        }

        //服务器给客户端响应一个cookie
        Cookie cookie = new Cookie("lastLoginTime",System.currentTimeMillis()+"");
        cookie.setMaxAge(24*60*60);//设置cookie有效期 秒为单位
        resp.addCookie(cookie);

    }

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

//删除cookie
public class CookieDeom02 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Cookie cookie = new Cookie("lastLoginTime",System.currentTimeMillis()+"");
        cookie.setMaxAge(0);
        resp.addCookie(cookie);
    }

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

public class CookieDeom03 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("gbk");
        resp.setCharacterEncoding("gbk");
        PrintWriter out = resp.getWriter();
        Cookie[] cookies = req.getCookies();
        if(cookies!=null){
            out.write("上一次你访问的时间是：");

            for (int i = 0; i <cookies.length; i++) {
                Cookie cookie = cookies[i];

                if(cookie.getName().equals("name")){


                    out.write(URLDecoder.decode(cookie.getValue(),"utf-8"));//解决cookie中文乱码

                }


            }

        }else {
            out.write("这是您第一次访问本站");
        }
        Cookie cookie = new Cookie("name", URLEncoder.encode("胡浩","utf-8"));//解决cookie中文乱码
        resp.addCookie(cookie);
    }

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

循循渐进07篇 maven Cookie代码

原文：https://www.cnblogs.com/huhao2000/p/11977813.html