workon h1

django-admin startproject test

进入项目test目录,创建应用booktest,这个booktest应用目录和manage.py在

同级目录下

python manage.py startapp booktest

from django.shortcuts import render


def session1(request):

  uname = None

  context = {'uname':uname}

  return render(request, 'booktest/session1.html', context)

  from django.conf.urls import include, url
  from django.contrib import admin

  urlpatterns = [

    url(r'^admin/', include(admin.site.urls)),

    url(r'^booktest/', include('booktest.urls')),

  ]

  from django.conf.urls import url
  import views


  urlpatterns = [

    url(r'^session1/$', views.session1),

  ]

        你好:{{uname}}
        <br>
        <a href="/booktest/session2/" rel="external nofollow" >登录</a>
        <br>
        <a href="/booktest/session3/" rel="external nofollow" >退出</a>

  'DIRS': [os.path.join(BASE_DIR, 'templates')],

你好:None 
登录 
退出

1 视图session2代码如下:

def session2(request):

  return render(request, 'booktest/session2.html')

2 booktest/urls.py的应用url配置,添加如下代码:

  url(r'^session2/$', views.session2),

3 在templates/booktest目录下创建登录表单对应的模板文件session2.html

body代码如下:

    <form action="/booktest/session2_handle/" method="post">

        用户名: <input type="text" name="uname">
        <br>
        <input type="submit" value="提交">
    </form>

1  OperationalError at /booktest/session2_handle/
  no such table: django_session

解决办法:在test/settins.py添加以下代码,以保证session数据保存到redis

# SESSION_ENGINE = 'redis_sessions.session'
# SESSION_REDIS_HOST = 'localhost'
# SESSION_REDIS_PORT = '6379'
# SESSION_REDIS_DB = '0'
# SESSION_REDIS_PASSWORD = ''
# SESSION_REDIS_PREFIX = 'session'

使用django-admin startproject test默认会开启session.



2 Forbidden (403)

CSRF verification failed. Request aborted.

解决方法:在test/settins.py里面把 MIDDLEWARE_CLASSES的值里面以下代码注释

     'django.middleware.csrf.CsrfViewMiddleware',

from django.shortcuts import redirect

def session2_handle(request):

  uname = request.POST['uname']

  request.session['myname'] = uname

  return redirect('/booktest/session1/')

  由于http协议是无状态的,所以利用session来完成状态保持,把表单里面

  用户名输入的值赋值给类字典对象request.session里面的键 'myname'

修改视图session2对应的代码,把session类字典里面的键赋值给uname,使用

get方法可以避免uname = request.session['maname']在点击退出时报错.

KeyError at /booktest/session1/
  'myname'

  uname = request.session.get('myname', '未登录')

url(r'^session2_handle/$', views.session2_handle),

1 视图session3代码如下,作用删除session回话,并重定向到/booktest/session1/

  def session3(request):

    del request.session['myname']

    return redirect('/booktest/session1/')

2 应用下视图session3对应的url配置如下:

  url(r'^session3', views.session3)

  你好:未登录 
  登录 
  退出

  用户名:
  提交

 http://127.0.0.1:8000/booktest/session1/

  你好:ff
  登录 
  退出

  你好:未登录 
  登录 
  退出

 sudo service redis-server start  

 sudo ps ajx|grep redis

 redis-cli

 keys *   查看所有的键

 get 'myname' 查看键myname对应值,

 get mcp20n5r2lcbzb1rqjw2mpqe2lakjnpc 

 查看该键对应的值如下,拿到在线base64进行解码,即可

  "NzI4MzA2MmJlY2UxOWI2YWFlNjc2ZWZjMTY3NDE0OTJiMWFlMzgyNTp7Im15bmFtZSI6ImZmIn0="

  解码后7283062bece19b6aae676efc16741492b1ae3825:{"myname":"ff"}

  由此可见,可以使用redis来存储session,可以实现http状态保持.