Django框架中间件(Middleware)用法实例分析

from django.http import HttpResponsefrom django.shortcuts import render, redirectfrom django.urls import reversefrom django.utils.deprecation import MiddlewareMixinfrom MidUpVcode.settings import BLACK_LIST, VIP_LIST'''所有的钩子函数都可以返回一个Response一旦钩子函数返回了Response,整个请求的受理就结束了'''# 继承于框架中间件class MyappMiddleware(MiddlewareMixin): # 中间件的初始化方法,全局执行一次 # def __init__(self, get_response=None): #   super(MyappMiddleware, self).__init__() #   print(">>>>>>>>>> MyappMiddlware __init__") # 下钩子于所有路由被交给路由表之前 def process_request(self, request):   # 获取客户端IP地址   clientIp = request.META['REMOTE_ADDR']   # 请求的路由   url = request.path   print(">>> process_request", request, clientIp, url)   # # 屏蔽黑名单用户   # 只要客户端IP在黑名单中   # if clientIp in BLACK_LIST:   #   直接渲染fuckoff.html并立刻返回   #   return render(request,'fuckoff.html')   # # 当VIP用户访问福利页面时提供更多好的服务   # if clientIp in VIP_LIST and url=='/myapp/fuli/':   #   return render(request, 'fuli.html', context={'imgpath': 'meinv1.jpg'})   # 福利页必须登录了才能查看   if url == '/myapp/fuli/' and not request.session.get('uname', None):     return redirect(reverse('myapp:login')) # 下钩子于所有路由请求被交给视图函数之前 def process_view(self, request, view_func, view_args, view_kwargs):   print(">>> process_view", request, view_func, view_args, view_kwargs) # 理论上下钩子于所有路由请求的模板被渲染完成以后 # 这个函数实测无法回调 def process_template_response(self, request, response):   print(">>>>>>>>>> process_template_response", request, response)   return response # 下钩子于所有路由的响应被返回之前 def process_response(self, request, response):   print(">>>>>>>>>> process_response", request, response)   return response def process_exception(self, request, exception):   print(">>>>>>>>>> process_exception", request, exception)   return redirect('/')

class LearnAOP(MiddlewareMixin):  def process_request(self,request):    print('request的路径',request.GET.path)

MIDDLEWARE = [  ...  # 注册自定义的中间件  'middleware.MyMiddleware.MyappMiddleware',  ...]