FBV模式装饰器：
普通函数的装饰器（语法糖@）
views.py
from django.shortcuts import render def wrapper(f):
def inner(*args,**kwargs):
print("before")
ret=f(*args,**kwargs)
print("after")
return ret
return inner @wrapper
def index(request):
return render(request,"index.html")
CBV模式装饰器：
在CBV模式视图函数中必须先导入：from django.views import View
（1）重写父类dispatch分发方法，在分发执行每个请求响应函数前后加上相应功能为实现类比装饰器
views.py
from django.shortcuts import render,HttpResponse
from django.views import View
from django.utils.decorators import method_decorator class Myview(View): def dispatch(self, request, *args, **kwargs):
print("before")
ret=super().dispatch(request, *args, **kwargs)
print("after")
return ret def get(self, request):
return render(request, "login.html") def post(self, request):
if request.method == "GET":
return render(request, "login.html")
elif request.method == "POST":
if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "":
return render(request, "login_success.html", {"name": request.POST.get("username")})
else:
return HttpResponse("账号或密码有误！")
（2）在子类重写分发函数时加上装饰器（每个请求函数都会被装饰）
必须先导入：
from django.views import View
from django.utils.decorators import method_decorator
views.py
from django.shortcuts import render,HttpResponse
from django.views import View
from django.utils.decorators import method_decorator def wrapper(f):
def inner(*args,**kwargs):
print("before")
ret=f(*args,**kwargs)
print("after")
return ret
return inner class Myview(View): @method_decorator(wrapper)
def dispatch(self, request, *args, **kwargs):
ret=super().dispatch(request, *args, **kwargs)
return ret def get(self, request):
return render(request, "login.html") def post(self, request):
if request.method == "GET":
return render(request, "login.html")
elif request.method == "POST":
if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "":
return render(request, "login_success.html", {"name": request.POST.get("username")})
else:
return HttpResponse("账号或密码有误！")
（3）在子类重写的不同响应请求函数上加上装饰器
必须先导入：
from django.views import View
from django.utils.decorators import method_decorator
views.py
from django.shortcuts import render,HttpResponse
from django.views import View
from django.utils.decorators import method_decorator def wrapper(f):
def inner(*args,**kwargs):
print("before")
ret=f(*args,**kwargs)
print("after")
return ret
return inner class Myview(View):
# def dispatch(self, request, *args, **kwargs):
# ret=super().dispatch(request, *args, **kwargs)
# return ret def get(self, request):
return render(request, "login.html") @method_decorator(wrapper)
def post(self, request):
if request.method == "GET":
return render(request, "login.html")
elif request.method == "POST":
if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "":
return render(request, "login_success.html", {"name": request.POST.get("username")})
else:
return HttpResponse("账号或密码有误！")
（4）在子类定义时加上装饰器，必须指定而且唯一指定加在的函数
必须先导入：
from django.views import View
from django.utils.decorators import method_decorator
views.py
from django.shortcuts import render,HttpResponse
from django.views import View
from django.utils.decorators import method_decorator def wrapper(f):
def inner(*args,**kwargs):
print("before")
ret=f(*args,**kwargs)
print("after")
return ret
return inner @method_decorator(wrapper,name="post") class Myview(View):
# def dispatch(self, request, *args, **kwargs):
# ret=super().dispatch(request, *args, **kwargs)
# return ret def get(self, request):
return render(request, "login.html") def post(self, request):
if request.method == "GET":
return render(request, "login.html")
elif request.method == "POST":
if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "":
return render(request, "login_success.html", {"name": request.POST.get("username")})
else:
return HttpResponse("账号或密码有误！")
其它装饰器：
· 添加装饰器前必须导入from django.utils.decorators import method_decorator
· 添加装饰器的格式必须为@method_decorator()，括号里面为装饰器的函数名
· 给类添加是必须声明name
· 注意csrf-token装饰器的特殊性，在CBV模式下它只能加在dispatch上面(后面再说)
下面这是csrf_token的装饰器：
@csrf_protect，为当前函数强制设置防跨站请求伪造功能，即便settings中没有设置csrfToken全局中间件。
@csrf_exempt，取消当前函数防跨站请求伪造功能，即便settings中设置了全局中间件。
注意：from django.views.decorators.csrf import csrf_exempt,csrf_protect