标签：comm style with pre sage res request util exec
网上很多写法，都是传统的写法，
process_request和process_response方法，还可以用，
但process_view的执行流程已经不行了。
看了官方文档，推荐的写法，也是用__call__方法来作实现了。
我试了新老方法，从输出，可以看出效果了。
中间件处理的顺序还是request从上到下，response从下回到上的。
from django.utils.deprecation import MiddlewareMixin from django.shortcuts import HttpResponse class Row1(MiddlewareMixin): def __init__(self, get_response): self.get_response = get_response # One-time configuration and initialization. def process_request(self, request): print(‘中间件1的请求‘) def process_response(self, request, response): print(‘中间件1的返回‘) return response def __call__(self, request): # Code to be executed for each request before # the view (and later middleware) are called. print(‘中间件1的 view前调用‘) response = self.get_response(request) # Code to be executed for each request before # the view (and later middleware) are called. print(‘中间件1的 view之后调用‘) return response class Row2(MiddlewareMixin): def __init__(self, get_response): self.get_response = get_response # One-time configuration and initialization. def process_request(self, request): print(‘中间件2的请求‘) # return HttpResponse(‘前端显示：中间件：M2.process_request‘) def process_response(self, request, response): print(‘中间件2的返回‘) return response def __call__(self, request): # Code to be executed for each request before # the view (and later middleware) are called. print(‘中间件2的 view前调用‘) response = self.get_response(request) # Code to be executed for each request before # the view (and later middleware) are called. print(‘中间件2的 view之后调用‘) return response class Row3(MiddlewareMixin): def __init__(self, get_response): self.get_response = get_response # One-time configuration and initialization. def process_request(self, request): print(‘中间件3的请求‘) def process_response(self, request, response): print(‘中间件3的返回‘) return response def process_view(self, request, callback, callback_args, callback_kwargs): print(‘中间件3的 view‘)
settings.py里的排列：
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.cm1.Row1‘, ‘Middle.cm1.Row2‘, ‘Middle.cm1.Row3‘, ]
输出，注意Row3里process_view输出没有反应，
而Row1和Row2的process_request, process_rewponse的输出被忽略。
Quit the server with CTRL-BREAK. 中间件1的 view前调用 中间件2的 view前调用 中间件3的请求 中间件3的返回 中间件2的 view之后调用 中间件1的 view之后调用 [03/Jan/2019 20:08:58] "GET / HTTP/1.1" 200 16348
标签：comm style with pre sage res request util exec
原文地址：https://www.cnblogs.com/aguncn/p/10214364.html
