FBV模式装饰器：
普通函数的装饰器（语法糖@）
views.py
1 from django.shortcuts import render
2
3 def wrapper(f):
4 def inner(*args,**kwargs):
5 print("before")
6 ret=f(*args,**kwargs)
7 print("after")
8 return ret
9 return inner
10
11 @wrapper
12 def index(request):
13 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
1 from django.shortcuts import render,HttpResponse
2 from django.views import View
3 from django.utils.decorators import method_decorator
4
5 class Myview(View):
6
7 def dispatch(self, request, *args, **kwargs):
8 print("before")
9 ret=super().dispatch(request, *args, **kwargs)
10 print("after")
11 return ret
12
13 def get(self, request):
14 return render(request, "login.html")
15
16 def post(self, request):
17 if request.method == "GET":
18 return render(request, "login.html")
19 elif request.method == "POST":
20 if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "123":
21 return render(request, "login_success.html", {"name": request.POST.get("username")})
22 else:
23 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
1 from django.shortcuts import render,HttpResponse
2 from django.views import View
3 from django.utils.decorators import method_decorator
4
5 def wrapper(f):
6 def inner(*args,**kwargs):
7 print("before")
8 ret=f(*args,**kwargs)
9 print("after")
10 return ret
11 return inner
12
13 class Myview(View):
14
15 @method_decorator(wrapper)
16 def dispatch(self, request, *args, **kwargs):
17 ret=super().dispatch(request, *args, **kwargs)
18 return ret
19
20 def get(self, request):
21 return render(request, "login.html")
22
23 def post(self, request):
24 if request.method == "GET":
25 return render(request, "login.html")
26 elif request.method == "POST":
27 if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "123":
28 return render(request, "login_success.html", {"name": request.POST.get("username")})
29 else:
30 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
1 from django.shortcuts import render,HttpResponse
2 from django.views import View
3 from django.utils.decorators import method_decorator
4
5 def wrapper(f):
6 def inner(*args,**kwargs):
7 print("before")
8 ret=f(*args,**kwargs)
9 print("after")
10 return ret
11 return inner
12
13 class Myview(View):
14 # def dispatch(self, request, *args, **kwargs):
15 # ret=super().dispatch(request, *args, **kwargs)
16 # return ret
17
18 def get(self, request):
19 return render(request, "login.html")
20
21 @method_decorator(wrapper)
22 def post(self, request):
23 if request.method == "GET":
24 return render(request, "login.html")
25 elif request.method == "POST":
26 if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "123":
27 return render(request, "login_success.html", {"name": request.POST.get("username")})
28 else:
29 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
1 from django.shortcuts import render,HttpResponse
2 from django.views import View
3 from django.utils.decorators import method_decorator
4
5
6 def wrapper(f):
7 def inner(*args,**kwargs):
8 print("before")
9 ret=f(*args,**kwargs)
10 print("after")
11 return ret
12 return inner
13
14 @method_decorator(wrapper,name="post")
15
16 class Myview(View):
17 # def dispatch(self, request, *args, **kwargs):
18 # ret=super().dispatch(request, *args, **kwargs)
19 # return ret
20
21 def get(self, request):
22 return render(request, "login.html")
23
24 def post(self, request):
25 if request.method == "GET":
26 return render(request, "login.html")
27 elif request.method == "POST":
28 if request.POST.get("username") == "yang" and request.POST.get("userpsd") == "123":
29 return render(request, "login_success.html", {"name": request.POST.get("username")})
30 else:
31 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
原文地址：https://www.cnblogs.com/open-yang/p/11221435.html