中间件的使用

中间件是全局使用

工厂函数定义中间件

middleware.py

# 工厂函数的中间件
def simple_middleware(get_response):def middleware(request):print("在视图函数处理之前执行、、、、、")response = get_response(request)print("在视图函数处理之后执行。。。。。")return responsereturn middleware

setings.py中注册中间件

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','the_15.middleware.simple_middleware',
]

类定义中间件

# 类定义中间件
from django.utils.deprecation import MiddlewareMixinclass Mwi(MiddlewareMixin):def process_request(self, request):"""如果没有返回值或者返回值为 None 就会继续执行视图函数如果有返回值就不会执行视图函数中的内容，直接返回值，"""print("process_request 在视图函数之前执行、、、、、")passdef process_View(self, request, view_func, view_args, view_kwargs):print('process_View 正在执行中')passdef process_response(self, request, response):"""一定要有返回值"""print("process_response 在视图函数之后执行、、、、、")return response

setings.py中注册中间件 

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',# 'the_15.middleware.simple_middleware','the_15.middleware.Mwi',
]

执行顺序

中间件的属性与方法 

▶ get_response

▶ process_request(self, request)

▶ process_view(self, request, view_func, view_args, view_kwargs)

▶ process_response(self, request, response)

▶ process_template_response(self, request, response)