步步为营-75-Cookie简介

说明:cookie常用于数据保存

1 使用

　　//创建cookie

　　Response.cookies["yk"].value ="xyxtl";

　　//设置过期时间如果不设置cookie只存在内存中,无法实现长期保存

　　Response.cookies["yk"].Expires = DateTime.Now.AddDays(3);

　　//删除cookie == 修改过期时间

　　Response.cookies["yk"].Expires = DateTime.Now.AddDays(-3);

　　//cookie跨域正常的情况主域可以自动向子域传递数据,子域无法向主域传递数据

　　Response.cookies["yk"].Domain = "主域网址";

　　//cookie使用范围

　 Response.cookies["yk"].Path = ...

二：C#中的使用实例:记住密码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="01Cookie记住密码.aspx.cs" Inherits="_03状态保持_Cookies和Session_._01Cookie记住密码" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
   
</head>
<body>
    <form id="form1" method="post" >
    用户名:<input type="text" name="UserName"/>
        <br />
    密码:<input type="password" name="Pwd"/>
        <br />
     <input type="checkbox" id="Remember" name="Remember"  />记住我1周    
     <input type="checkbox" id="Forget" name="Forget" />退出 
        <br />
     <input type="submit" value="登录" />
    </form>
</body>
</html>

aspx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace _03状态保持_Cookies和Session_
{
    public partial class _01Cookie记住密码 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //写入cookie
            if (   Request["Remember"]=="on")
            {
                string userName = Request["UserName"];
                string pwd = Request["Pwd"];
                Response.Cookies[userName].Value = pwd;
                Response.Cookies[userName].Expires = DateTime.Now.AddDays(7);

            }
            //删除cookie
            if ( Request["Forget"] == "on")
            {
                string userName = Request["UserName"];
                string pwd = Request["Pwd"];
                Response.Cookies[userName].Value = pwd;
                Response.Cookies[userName].Expires = DateTime.Now.AddDays(-3);

            }
            //判断cookie
            if ( (Request.Cookies["yk"]) != null)
            {
                if (Request.Cookies["yk"].Value == "123")
                {
                    Response.Write("登录成功!");
                     Response.Write(Request["category"]);
                }
                else {
                    Response.Write("登录失败!");
                    Response.Write(Request["category"]);
                }
            }
            else 
            {
                if (!String.IsNullOrEmpty(Request["UserName"]) && !String.IsNullOrEmpty(Request["Pwd"]) && Request["UserName"] == "yk" && Request["Pwd"]=="123")
                {
                    Response.Write("登录成功!");
                    Response.Write(Request["category"]);
                }
                else {
                    Response.Write("登录失败!");
                      Response.Write(Request["category"]);
                }
            }
        }
    }
}

aspx.cs

在不使用cookie记录前登录是失败的

三：python 中使用cookie直接访问index页面

1：注释掉setting.py的中间件配置

2：配置路由

"""cookie_Session URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/2.1/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
"""
from django.contrib import admin
from django.urls import path
from app011 import views
urlpatterns = [
    path('admin/', admin.site.urls),
    path('login/', views.login),
    path('index/', views.index),

]

urls.py

from django.shortcuts import render,redirect

# Create your views here.
def login(request):
    # print("SSSSSSSSS",request.session)
    if request.method=="POST":
        name=request.POST.get("user")
        pwd = request.POST.get("pwd")
        if  name=="aaron" and pwd=="1":
            ret = redirect("/index/")
            ret.set_cookie("user",name)
            ret.set_cookie("password",pwd)
            return ret
    return render(request,"login.html")

def index(request):

    if  request.COOKIES.get("user",None) == "aaron":
        name = "aaron"
        return render(request, "index.html",locals())
    else:
        return redirect("/login/")

Views.py

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>{{ name }}</h1>
</body>
</html>

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <style>
        *{
            margin: 0;
            padding:0;
        }
    </style>
</head>
<body>
<form action="/login/" method="post">
    <p>姓名<input type="text" name="user"></p>
    <p>密码<input type="password" name="pwd"></p>
    <p><input type="submit"></p>

</form>
</body>
</html>