def my_middleware(get_response):
 print('中间件初始化')
 def middlewraer(request, *args, **kwargs):
  print('在执行执行前对请求进行干预')
  # 加入干预代码, 主要应用白名单黑名单
  if request.META['USER'] == 'KG':
   return HttpResponse('该用户无法访问')
  ret = get_response(request, *args,**kwargs)
  print('在执行后对响应进行干预')
  return ret
 return middlewrae

MIDDLEWARE = [
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 # 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
　　 # 注册中间件
 'users.middleware.my_middleware', 
]

@decorator1
@decorator2
def index(View): 
 pass