回顾基础知识，类，fbv,cbv

一 类中绑定方法的传参，不需要self

class Foo(object):
    def __init__(self,name):
        self.name = name
    def foo(self,x):
        self.x = x

f = Foo('sccc')

func = f.foo
func('miracle')
print(f.x)

　　输出：

miracle

　　同样

class OrderView(View):
    def dispatch(self, request, *args, **kwargs):
        print(self.request.method)
        func = getattr(self,request.method.lower())
        print(func)
        ret = func(request,*args,**kwargs)
        return ret
    def get(self,request,*args,**kwargs):
        return HttpResponse('get')
    def post(self,request,*args,**kwargs):
        return HttpResponse('post')
    def delete(self,request,*args,**kwargs):
        return HttpResponse('delete')
    def update(self,request,*args,**kwargs):
        return HttpResponse('update')

　　输出： 注意，request.method 会将get，post等变为大写。

GET
[/Mar/ ::] "GET /orders/ HTTP/1.1"
<bound method OrderView.get of <app01.views.OrderView object at 0x000001215CF09E48>>

　　

二 super 与 mro顺序

　　为了实现继承,python会在MRO列表上从左到右开始查找基类,直到找到第一个匹配这个属性的类为止。

class A:
    def xx(self):
        print('xxx')
        super().xx()
        print(super())
class C:
    def xx(self):
        print('cc')
        print(super())
class B(A,C):
    pass

b = B()
b.xx()
print(B.mro())

　　输出：

xxx
cc
<super: <class 'C'>, <B object>>
<super: <class 'A'>, <B object>>
[<class '__main__.B'>, <class '__main__.A'>, <class '__main__.C'>, <class 'object'>]

　　从 父类A中，super（），继续按照mro顺序查找。

　　同样的道理。

　　自定义父类 MyBaseView，子类 StudentView 继承MyBaseView和系统导入的View。 实现在原有View基础的扩增功能，类似装饰器。

class MyBaseView(object):
    def dispatch(self,request,*args,**kwargs):
        print('before')
        ret = super(MyBaseView,self).dispatch(request,*args,**kwargs)
        print('after')
        return ret
class StudentView(MyBaseView,View):
    def get(self,request,*args,**kwargs):
        return HttpResponse('get')
    def post(self,request,*args,**kwargs):
        return HttpResponse('post')
    def delete(self,request,*args,**kwargs):
        return HttpResponse('delete')
    def update(self,request,*args,**kwargs):
        return HttpResponse('update')

三  csrf_exempt,csrf_protect

　　from django.views.decorators.csrf import csrf_exempt,csrf_protect

　　可以单独对某个FBV,或CBV进行csrf 设置。

　　FBV的设置比价简单，直接加装饰器

                    @csrf_protect # 该函数需认证
                    def users(request):
                        user_list = ['alex','oldboy']
                        return HttpResponse(json.dumps((user_list)))

@csrf_exempt # 该函数无需认证
def users(request):
    user_list = ['alex','oldboy']
    return HttpResponse(json.dumps((user_list)))

　　CBV相对复杂一些。

方式一：
    from django.views.decorators.csrf import csrf_exempt,csrf_protect
    from django.utils.decorators import method_decorator
    class StudentsView(View):

        @method_decorator(csrf_exempt)
        def dispatch(self, request, *args, **kwargs):
            return super(StudentsView,self).dispatch(request, *args, **kwargs)

        def get(self,request,*args,**kwargs):
            print('get方法')
            return HttpResponse('GET')

        def post(self, request, *args, **kwargs):
            return HttpResponse('POST')

        def put(self, request, *args, **kwargs):
            return HttpResponse('PUT')

        def delete(self, request, *args, **kwargs):
            return HttpResponse('DELETE')

方式二：
    from django.views.decorators.csrf import csrf_exempt,csrf_protect
    from django.utils.decorators import method_decorator

    @method_decorator(csrf_exempt,name='dispatch')
    class StudentsView(View):
        def dispatch(self, request, *args, **kwargs):
            return super(StudentsView,self).dispatch(request, *args, **kwargs)

        def get(self,request,*args,**kwargs):
            print('get方法')
            return HttpResponse('GET')

        def post(self, request, *args, **kwargs):
            return HttpResponse('POST')

        def put(self, request, *args, **kwargs):
            return HttpResponse('PUT')

        def delete(self, request, *args, **kwargs):
            return HttpResponse('DELETE')

四 FBV,CBV

　　CBV，基于反射实现根据请求方式不同，执行不同的方法。　　

　　原理：
　　　　url -> view方法 -> dispatch方法（反射执行其他：GET/POST/DELETE/PUT）

　　

　　流程：

class StudentsView(View):
                def dispatch(self, request, *args, **kwargs):
                    print('before')
                    ret = super(StudentsView,self).dispatch(request, *args, **kwargs)
                    print('after')
                    return ret

                def get(self,request,*args,**kwargs):
                    return HttpResponse('GET')

                def post(self, request, *args, **kwargs):
                    return HttpResponse('POST')

                def put(self, request, *args, **kwargs):
                    return HttpResponse('PUT')

                def delete(self, request, *args, **kwargs):
                    return HttpResponse('DELETE')