062.Python前段框架Django视图CBV
一 CBV与FBV
- CBV:Class Based View
- FBV:Function Based View
- 之前写过的都是基于函数的view,就叫FBV。还可以把view写成基于类的,那就是CBV。
1.1 创建项目
root@darren-virtual-machine:~/PycharmProjects# django-admin startproject cbv_test
root@darren-virtual-machine:~/PycharmProjects# cd cbv_test/
root@darren-virtual-machine:~/PycharmProjects/cbv_test# python3 manage.py startapp app01
setting注册app
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'app01.apps.App01Config',
]
root@darren-virtual-machine:~/PycharmProjects/cbv_test# mkdir templates
root@darren-virtual-machine:~/PycharmProjects/cbv_test# vim cbv_test/settings.py
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(BASE_DIR,"templates")],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
路由分发
from django.contrib import admin
from django.urls import path,include urlpatterns = [
path('admin/', admin.site.urls),
path('app01/',include(app01.urls)),
]
配置一个登录页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h3>用户登录</h3>
<form action="" method="POST">
{% csrf_token %}
<p>用户名:<input type="text" name="username"></p>
<p>密 码:<input type="password" name="password"></p>
<input type="submit">
</form> </body>
</html>
url文件
from django.urls import path,re_path
from app01 import views urlpatterns = [
path('login/',views.login),
]
views视图文件
from django.shortcuts import render,redirect,HttpResponse # Create your views here.
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html")
访问

1.2 使用CBV改写
urls文件
from django.urls import path,re_path
from app01 import views urlpatterns = [
path('login_fbv/',views.login),
path('login_cbv/', views.Login.as_view()),
]
views文件
from django.shortcuts import render,redirect,HttpResponse
from django.views import View # Create your views here.
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html") #CBV
class Login(View):
def get(self,request):
return render(request, "login.html")
def post(self,request):
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request, "login.html")
访问http://127.0.0.1:8000/app01/login_cbv/登录

FBV本身就是一个函数,所以和给普通的函数加装饰器无差
1.3 使用装饰器装饰CBV
给CBV加装饰器
from django.shortcuts import render,redirect,HttpResponse
from django.views import View
import time # Create your views here. def timer(func):
def inner(request,*args,**kwargs):
start_time = time.time()
time.sleep(2)
rep = func(request,*args,**kwargs)
end_time = time.time()
print (end_time-start_time)
return rep
return inner #FBV
@timer
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html")
1.4 使用装饰器装饰FBV
类中的方法与独立函数不完全相同,因此不能直接将函数装饰器应用于类中的方法 ,我们需要先将其转换为方法装饰器。Django中提供了method_decorator装饰器用于将函数装饰器转换为方法装饰器。
1.4.1 给某个方法加上装饰器
此例给get方法加上)
from django.shortcuts import render,redirect,HttpResponse
from django.views import View
import time
from django.utils.decorators import method_decorator
# Create your views here. def timer(func):
def inner(request,*args,**kwargs):
start_time = time.time()
time.sleep(2)
rep = func(request,*args,**kwargs)
end_time = time.time()
print (end_time-start_time)
return rep
return inner #FBV
@timer
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html") #CBV
class Login(View):
@method_decorator(timer)
def get(self,request):
return render(request, "login.html")
def post(self,request):
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request, "login.html")
访问http://127.0.0.1:8000/app01/login_cbv/,只有get有,post并没有用到装饰器
[10/Apr/2020 11:27:53] "GET /app01/login_cbv HTTP/1.1" 301 0
2.024909496307373
[10/Apr/2020 11:27:55] "GET /app01/login_cbv/ HTTP/1.1" 200 456
[10/Apr/2020 11:28:05] "POST /app01/login_cbv/ HTTP/1.1" 200 16
1.4.2 加在dispatch方法上面
会给类下的所有方法加上此装饰器
from django.shortcuts import render,redirect,HttpResponse
from django.views import View
import time
from django.utils.decorators import method_decorator
# Create your views here. def timer(func):
def inner(request,*args,**kwargs):
start_time = time.time()
time.sleep(2)
rep = func(request,*args,**kwargs)
end_time = time.time()
print (end_time-start_time)
return rep
return inner #FBV
@timer
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html") #CBV
class Login(View):
@method_decorator(timer)
def dispatch(self, request, *args, **kwargs):
obj = super().dispatch(request,*args,**kwargs)
return obj #这里必须返回,否则Httpresponse错误
#@method_decorator(timer)
def get(self,request):
return render(request, "login.html")
def post(self,request):
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request, "login.html")
访问http://127.0.0.1:8000/app01/login_cbv
[10/Apr/2020 11:35:08] "GET /app01/login_cbv/ HTTP/1.1" 200 456
2.01680588722229
2.00297474861145
[10/Apr/2020 11:35:16] "POST /app01/login_cbv/ HTTP/1.1" 200 16
1.4.3加在类上面
from django.shortcuts import render,redirect,HttpResponse
from django.views import View
import time
from django.utils.decorators import method_decorator
# Create your views here. def timer(func):
def inner(request,*args,**kwargs):
start_time = time.time()
time.sleep(2)
rep = func(request,*args,**kwargs)
end_time = time.time()
print (end_time-start_time)
return rep
return inner #FBV
@timer
def login(request):
if request.method == "GET":
return render(request,"login.html")
else:
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request,"login.html") #CBV
@method_decorator(timer,name="get")
#如果需要给post方法家装饰器,method_decorator(timer,nmae="post"),必须制定name的值,否则报错
class Login(View):
#@method_decorator(timer)
def dispatch(self, request, *args, **kwargs):
obj = super().dispatch(request,*args,**kwargs)
return obj #这里必须返回,否则Httpresponse错误
#@method_decorator(timer)
def get(self,request):
return render(request, "login.html")
def post(self,request):
username = request.POST.get("username")
password = request.POST.get("password")
if username == "joy" and password == "123456":
return HttpResponse("login success...")
else:
return render(request, "login.html")
访问http://127.0.0.1:8000/app01/login_cbv/
2.017592191696167
[10/Apr/2020 11:39:04] "GET /app01/login_cbv/ HTTP/1.1" 200 456
[10/Apr/2020 11:39:10] "POST /app01/login_cbv/ HTTP/1.1" 200 16
在给类加装饰器的时候,也可以使用name=dispatch,也可以,关键是必须有这个类存在
062.Python前段框架Django视图CBV的更多相关文章
- python测试开发django-73.django视图 CBV 和 FBV
前言 FBV(function base views) 就是在视图里使用函数处理请求,这一般是学django入门的时候开始使用的方式. CBV(class base views) 就是在视图里使用类处 ...
- 利用python web框架django实现py-faster-rcnn demo实例
操作系统.编程环境及其他: window7 cpu python2.7 pycharm5.0 django1.8x 说明:本blog是上一篇blog(http://www.cnblogs.co ...
- python 终极篇 --- django 视图系统
Django的View(视图) 一个视图函数(类),简称视图,是一个简单的Python 函数(类),它接受Web请求并且返回Web响应. 响应可以是一张网页的HTML内容,一个重定向,一个404错误, ...
- django视图 CBV 和 FBV
目录 视图 CBV 和 FBV 什么是视图? FBV function based view 基于函数的视图 CBV class based view 基于类的视图 小技巧 CBV 如何获取页面请求类 ...
- python web框架Django入门
Django 简介 背景及介绍 Django是一个开放源代码的Web应用框架,由Python写成.采用了MVC的框架模式,即模型M,视图V和控制器C.它最初是被开发来用于管理劳伦斯出版集团旗下的一些以 ...
- Django(视图 CBV、FBV)
day67 参考:http://www.cnblogs.com/liwenzhou/articles/8305104.html CBV和FBV 我们之前写过的都是基于函数的view,就叫FBV.还可以 ...
- Python Web框架——Django
返回顶部 使用框架简单快速开发特定的系统. pip freeze > requirements.txt pip install -r requirements.txt 一 MVC和MTV模式 二 ...
- python web框架 Django进阶
django 进阶 基础中,一些操作都是手动创建连接的非主流操作,这样显得太low,当然也是为了熟悉这个框架! 实际中,django自带连接数据库和创建app的机制,同时还有更完善的路由系统机制.既然 ...
- python web框架 Django基本操作
django 操作总结! django框架安装: cmd安装: pip3 install django pycharm安装: 在python变量下 搜索 django 安装 创建django项目: c ...
随机推荐
- OO第二章总结
OO第二章总结 电梯作业终于结束了!!! 这三周作业用多线程模拟搭建电梯的运行,我从开始对多线程的一无所知到结束时的能够完成一些多线程任务的水平,进步还是蛮大的,尽管过程有点艰难. 一.复杂度与UML ...
- Buuctf刷题:部分
get_started_3dsctf_2016 关键词:ROP链.栈溢出.mprotect()函数 可参考文章(优质): https://www.cnblogs.com/lyxf/p/12113401 ...
- 浅入Kubernetes(7):应用部署实例,Deployment、Service、ReplicaSet
目录 Deployment 创建 Deployment kubectl apply/create 网络端口映射和更新 Deployment ReplicaSet 在本文之前,你需要阅读: 尝试 kub ...
- Tony老师带你来看Java设计模式:代理模式
目录 定义 作用 意图 主要解决问题 优缺点 与装饰者模式的区别 结构 从Tony老师来看实现方式 静态代理 动态代理 JDK动态代理的实现 cglib动态代理的实现 定义 为其他对象提供一种代理来控 ...
- Borrowers UVA - 230
I mean your borrowers of books - those mutilators of collections, spoilers of the symmetry of shel ...
- JAVAEE_Servlet_03_Servlet对象生命周期
Servlet的对象声明周期 * 什么是对象生命周期? - 生命周期表示一个JAVA对象从创建到销毁的过程是一个生命周期 * Servlet对象生命周期 1. Servlet对象创建 无参构造 2. ...
- .Net之静态资源
介绍 静态文件都存储在Core Web根目录中.默认目录是<content_root>/wwwroot,但可通过 UseWebRoot方法更改访问目录.而content_root是指web ...
- hdu4908 中位数子串
题意: 给你N个数字组成的数列,然后问你这里面有多少个是以M为中位数的子序列. 思路: 首先分四中简单的情况求 (1) 就是只有他自己的那种情况 那么sum+1 ...
- Windows中的工作组和域
目录 工作组 工作组的访问 工作组的优缺点 域 域结构 域的原理 部署域架构 如何加入域 域中主机的登录 SRV出错及解决办法 SRV记录注册不成功的可能原因 禁用域中的账户 将计算机退出域 工作组 ...
- JSONP跨域资源共享的安全问题
目录 关于 JSONP 一.JSON 劫持 二.Callback 可定义导致的安全问题 三.其他文件格式( Content-Type )与 JSON 四.防御 摘自:http://blog.known ...