# url.py

from django.conf.urls import url, include

from mytest import views

urlpatterns = [

    url(r‘^index/‘, views.index),

]

# views.py

from django.shortcuts import render

def index(req):

    if req.method == ‘POST‘:

        print(‘method is :‘ + req.method)

    elif req.method == ‘GET‘:

        print(‘method is :‘ + req.method)

    return render(req, ‘index.html‘)

# urls.py

from mytest import views

urlpatterns = [

    # url(r‘^index/‘, views.index),

    url(r‘^index/‘, views.Index.as_view()),

]

# views.py

from django.views import View

class Index(View):

    def get(self, req):

        print(‘method is :‘ + req.method)

        return render(req, ‘index.html‘)

    def post(self, req):

        print(‘method is :‘ + req.method)

        return render(req, ‘index.html‘)

# 注：类要继承 View ，类中函数名必须小写。

# cbv 模式下继承了django的view类

# 在请求来临的时候，会调用继承类的 dispatch 方法

# 通过反射的方法它会去调用自己写的视图函数, 那么这便是一个切入点，可以在自己的 cbv 视图中，重写这个方法。

class View(object):

    def dispatch(self, request, *args, **kwargs):

        # Try to dispatch to the right method; if a method doesn't exist,

        # defer to the error handler. Also defer to the error handler if the

        # request method isn't on the approved list.

        if request.method.lower() in self.http_method_names:

            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)

        else:

            handler = self.http_method_not_allowed

        return handler(request, *args, **kwargs)

CBV模式下的一个拓展