django-登录和退出及redis存储session信息

登录

1.视图函数views.py

# 登录
from django.contrib.auth import authenticate, login  # authenticate:user认证  login:用户登录并记录session
class LoginView(View):
    '''登录'''
    def get(self, request):
        '''显示登录页面'''
        # 判断是否记住用户名
        if 'username' in request.COOKIES:
            username = request.COOKIES.get('username')
            checked = 'checked'
        else:
            username= ''
            checked = ''
        # 使用模板
        return render(request, 'login.html', {'username':username, 'checked':checked})

    def post(self, request):
        '''登录校验'''
        # 接收数据
        username = request.POST.get('username')
        password = request.POST.get('pwd')

        # 校验数据
        if not all([username, password]):
            return render(request, 'login.html', {'errmsg':'数据不完整'})

        user = authenticate(username=username, password=password)  # 查找数据库，有的话返回user信息 没有的话返回None
        if user is not None:
            # 用户名和密码正确
            # 验证是否激活
            if user.is_active:
                # 用户已激活
                # 记录用户登录状态
                login(request, user)  # django.contrib.auth中的login方法
                # 跳转到首页
                response = redirect(reverse('goods:index'))  # HttpResponseRedirct
                # 判断是否要记住用户名
                remember = request.POST.get('remember')

                if remember == 'on':
                    # 记住用户名
                    response.set_cookie('username', username, max_age=7*24*3600)  # 记录cookie
                else:
                    response.delete_cookie('username')
                # 返回response
                return response

            else:
                return render(request, 'login.html', {'errmsg':'用户尚未激活'})
        else:
            # 用户名或密码错误
            return render(request, 'login.html', {'errmsg':'用户名或密码错误'})

2.模板login.html

<form method="post">
                        {% csrf_token %}
                        <input type="text" name="username" class="name_input" value="{{ username }}" placeholder="请输入用户名">
                        <div class="user_error">输入错误</div>
                        <input type="password" name="pwd" class="pass_input" placeholder="请输入密码">
                        <div class="pwd_error">输入错误</div>
                        <div class="more_input clearfix">
                            <input type="checkbox" name="remember" {{ checked }}>
                            <label>记住用户名</label>
                            <a href="#">忘记密码</a>
                        </div>
                        <input type="submit" name="" value="登录" class="input_submit">
                    </form>

3.使用django-redis

django-redis文档：https://django-redis-chs.readthedocs.io/zh_CN/latest/

配置settings.py文件

# django缓存配置
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://192.168.199.130:6379/9",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}
# 存储在缓存中：存储在本机内存中，如果丢失则不能找回，比数据库的方式读写更快。
SESSION_ENGINE = "django.contrib.sessions.backends.cache"
SESSION_CACHE_ALIAS = "default"

报错

Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/utils/autoreload.py", line 77, in raise_last_exception
    raise _exception[1]
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 665, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/models/base.py", line 117, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/models/base.py", line 321, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/models/options.py", line 204, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/__init__.py", line 28, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/utils.py", line 201, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/utils.py", line 110, in load_backend
    return import_module('%s.base' % backend_name)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/home/python/.virtualenvs/bj19/lib/python3.5/site-packages/django/db/backends/mysql/base.py", line 36, in <module>
    raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

 原因django-redis版本是4.10.0 不支持django1.8.2 自动把django版本升到了2.2.5

pip install django-redis==4.7.0

 退出

视图函数views.py

# 退出
from django.contrib.auth import logout  # logout:退出并清除session信息
class LogoutView(View):
    def get(self, request):
        '''退出页面'''
        # 退出并清除session信息
        logout(request)

        # 跳转到首页
        return redirect(reverse('goods:index'))