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 response
    return 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 MiddlewareMixin


class 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、、、、、")
        pass

    def process_View(self, request, view_func, view_args, view_kwargs):
        print('process_View 正在执行中')
        pass

    def 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