day82 中间件

 

中间件

settings.py

from django.middleware.csrf import CsrfViewMiddleware #中间间的本质就是类

MIDDLEWARE = [

'md.middleware.M1', #导入md文件夹middleware.py下的M1类

'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',

'md.middleware.M2',

]

middleware.py

from django.utils.deprecation import MiddlewareMixin #导入CsrfViewMiddleware内部继承的类

class M1(MiddlewareMixin):

def process_request(self,request): #定义自己的process_request方法

print("m1.process_request")

def process_response(self,request,response): #定义自己的process_response方法

print("m1.process_response")

return response

# 源码为def process_view(self,request,callback,callback_args,callback_kwargs):

# 视图函数 视图函数的args 视图函数的kwargs

def process_view(self,request,view_func,view_func_args,view_func_kwargs):

print("m2.process_view")

class M2(MiddlewareMixin):

def process_request(self,request):

print("m2.process_request")

def process_response(self,request,response):

print("m2.process_response")

return response

def process_view(self,request,view_func,view_func_args,view_func_kwargs):

print("m2.process_view")

#执行结果依次为

m1.process_request

m2.process_request

m1.process_view

m2.process_view

m2.process_response

m1.process_response

process_view的执行顺序(执行完路由匹配后自上而下执行)

process_view的返回顺序

process_exception

process_template

返回的对象有render方法才被执行

ps:

博客园中有两种插入代码的方式

针对推荐的插入代码方式, 可以使用如下代码快速展开折叠的代码

$('div.cnblogs_code_hide').click();

针对另一种插入代码的方式, 可以使用如下代码快速展开折叠的代码

$('div.syntaxhighlighter').removeClass('collapsed');

process_view

来自为知笔记(Wiz)