Django框架学习笔记（23.中间件结合实例介绍）

中间件的作用是对所有的请求做统一操作

实例：

创建一个Middle文件夹，新建一个m1.py

from django.utils.deprecation import MiddlewareMixinfrom django.shortcuts import HttpResponseclass Row1(MiddlewareMixin):    def process_request(self, request):        print('1')    def process_response(self, request, response):        print('|1|')        return responseclass Row2(MiddlewareMixin):    def process_request(self, request):        print('2')        return HttpResponse('STOP')    def process_response(self, request, response):        print('|2|')        return responseclass Row3(MiddlewareMixin):    def process_request(self, request):        print('3')    def process_response(self, request, response):        print('|3|')        return response

定义一个测试URL：

urls.py:

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

views.py:

def test(request):    print('成功')    return HttpResponse('OK')

settings.py中配置中间件：

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',    'Middle.m1.Row1',    'Middle.m1.Row2',    'Middle.m1.Row3',]

运行后访问测试URL输出：

中间件还有其他操作：

m1.py:

from django.utils.deprecation import MiddlewareMixinfrom django.shortcuts import HttpResponseclass Row1(MiddlewareMixin):    def process_request(self, request):        print('1')    def process_view(self, request, view_func, view_func_args, view_func_kwargs):        print('*1*')    def process_response(self, request, response):        print('|1|')        return responseclass Row2(MiddlewareMixin):    def process_request(self, request):        print('2')    def process_view(self, request, view_func, view_func_args, view_func_kwargs):        print('*2*')    def process_response(self, request, response):        print('|2|')        return responseclass Row3(MiddlewareMixin):    def process_request(self, request):        print('3')    def process_view(self, request, view_func, view_func_args, view_func_kwargs):        print('*3*')    def process_response(self, request, response):        print('|3|')        return response

运行后：

还有几个不重要并且很少使用的，就不介绍了