python中间件，,1.中间件的方法pr

python中间件，,1.中间件的方法pr

1.中间件的方法

process_request(self,request)process_view(self, request, callback, callback_args, callback_kwargs)process_template_response(self,request,response)process_exception(self, request, exception)process_response(self, request, response

2.中间件运行机制

　　a.玩法1

from  django.utils.deprecation import MiddlewareMixinclass M1(MiddlewareMixin):    def process_request(self, request):        print(‘M1.request‘)     def process_view(self, request,callback,callback_args,callback_kwargs ):        print("M1.process_view")         def process_response(self, request, response):        print(‘M1.response‘)        return response class M2(MiddlewareMixin):    def process_request(self, request):        print(‘M2.request‘)     def process_view(self, request,callback,callback_args,callback_kwargs ):        print("M2.process_view")      def process_response(self, request, response):        print(‘M2.response‘)        return response

#### 输出结果M1.requestM2.requestM1.process_viewM2.process_view#执行views视图M2.responseM1.response

　　b.玩法2

from  django.utils.deprecation import MiddlewareMixinclass M1(MiddlewareMixin):    def process_request(self, request):        print(‘M1.request‘)    # callback视图函数名称 callback_args,callback_kwargs 视图函数执行所需的参数    def process_view(self, request,callback,callback_args,callback_kwargs ):        print("M1.process_view")        response=callback(request,*callback_args,**callback_kwargs)        return response    def process_response(self, request, response):        print(‘M1.response‘)        return responseclass M2(MiddlewareMixin):    def process_request(self, request):        print(‘M2.request‘)      def process_view(self, request,callback,callback_args,callback_kwargs ):        print("M2.process_view")    def process_response(self, request, response):        print(‘M2.response‘)        return response

####输出结果M1.requestM2.requestM1.process_view#执行views视图函数M2.responseM1.response

python中间件