FBV + CBV

django中请求处理方式有2种：FBV 和 CBV

FBV(function bases views)

就是在视图里使用函数处理请求,如下:

# urls.py

from django.conf.urls import url, include
from app01 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')

注意此处定义的是函数【def index(req):】

<!--index.html-->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
</head>
<body>
    <form action="" method="post">
        <input type="text" name="A" />
        <input type="submit" name="b" value="提交" />
    </form>
</body>
</html>

FBV中加装饰器相关

def deco(func):
    def wapper(request,*agrs,**kwargs):
        if request.COOKIES.get('LOGIN'):
            return func(request, *args, **kwargs)     
        return redirect('/login/')
    return wrapper


@deco
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')

上面就是FBV的使用。

CBV(class bases views)

就是在视图里使用类处理请求,如下:

# urls.py

from app01 import views
 
urlpatterns = [
    url(r'^index/', views.Index.as_view()),
]

# views.py

from django.views import View
 
# 类要继承View ，类中函数名必须小写
class Index(View):
    def get(self, req):
        '''
        处理GET请求
        '''
        print('method is :' + req.method)
        return render(req, 'index.html')
 
    def post(self, req):
        '''
        处理POST请求
        '''
        print('method is :' + req.method)
        return render(req, 'index.html')

CBV中加装饰器相关

要在CBV视图中使用我们上面的check_login装饰器，有以下三种方式：

加在CBV视图的get或post方法上

from django.utils.decorators import method_decorator
from django.views import View

class Index(View):
    
    def dispatch(self,req,*args,**kwargs):
        return super(Index,self).dispatch(req,*args,**kwargs)
    
    
    def get(self, req):
        print('method is :' + req.method)
        return render(req, 'index.html')
    
 	@method_decorator(deco)
    def post(self, req):
        print('method is :' + req.method)
        return render(req, 'index.html')

加在diapatch方法上，因为CBV中首先执行的就是dispatch方法，所以这么写相当于给get和post方法都加上了登录校验。

from django.utils.decorators import method_decorator
from django.views import View

class Index(View):
    
    @method_decorator(deco)
    def dispatch(self,req,*args,**kwargs):
        return super(Index,self).dispatch(req,*args,**kwargs)
    
    
    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')

直接加在视图类上，但method_decorator必须传name关键字参数

如果get方法和post方法都需要登录校验的话就写两个装饰器

from django.utils.decorators import method_decorator
from django.views import View


@method_decorator(deco,name='get')
@method_decorator(deco,name='post')
class Index(View):

    def dispatch(self,req,*args,**kwargs):
        return super(Index,self).dispatch(req,*args,**kwargs)
    
    
    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')