Django--FBV + CBV
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')
