Django练习——用户管理系统——补充知识点

Posted 2020-10-16

补充知识点：

1.FBV 和 CBV

views.py
# 方法一：FBV
def login(request):
    if request.method == "POST":
        user = request.POST.get("user")
        pwd = request.POST.get("pwd")
        c = models.Administrator.objects.filter(username=user,password=pwd).count()
        print(c)
        if c:
            #设置session中存储的数据
            request.session["is_login"] = True
            request.session["username"] = user
            #尤其注意跳转到哪个页面！！！
            return render(request,"index.html",{"username":user})
        else:
            msg = "用户名或密码错误"
            return redirect("/login.html",{"msg":msg})

    return render(request,"login.html")

---

urs.py

# url(r‘^login.html$‘, views.login),

cbv：

#CBV
from django import views
class Login(views.View):
    def get(self,request,*args,**kwargs):
        return render(request, "login.html")

    def post(self,request,*args,**kwargs):
        user = request.POST.get("user")
        pwd = request.POST.get("pwd")
        c = models.Administrator.objects.filter(username=user, password=pwd).count()
        print(c)
        if c:
            #设置session中存储的数据
            request.session["is_login"] = True
            request.session["username"] = user
            #尤其注意跳转到哪个页面！！！
            return render(request,"index.html",{"username":user})
        else:
            msg = "用户名或密码错误"
            return redirect("/login.html",{"msg":msg})

---

urs.py

url(r‘^login.html$‘, views.Login.as_view()),#以类的方式进行创建

2.类中用装饰器

 方法一：自定义装饰器

from django import views
from django.utils.decorators import method_decorator#1.引入库
#2.定义装饰器函数
def outer(func):
    def inner(request,*args,**kwargs):
        print(request.method)
        return func(request,*args,**kwargs)
    return inner

class Login(views.View):
    #3.使用装饰器
    @method_decorator(outer)
    def get(self,request,*args,**kwargs):
        return render(request, "login.html")

 方法二：自定义dispatch方法，同时继承父类该方法，等同于装饰器

 

from django import views

class Login(views.View):
    #1.先执行自定义的dispatch方法
    def dispatch(self, request, *args, **kwargs):
        print(11111)
        if request.method == "GET":
            return HttpResponse("ok")
        #2.再调用父类中的dispatch方法，dispatch方法类似路由分发
        ret = super(Login,self).dispatch(request, *args, **kwargs)
        print(22222)
        return ret

    def get(self,request,*args,**kwargs):
        return render(request, "login.html")

    def post(self,request,*args,**kwargs):
        user = request.POST.get("user")
        pwd = request.POST.get("pwd")
        c = models.Administrator.objects.filter(username=user, password=pwd).count()
        print(c)
        if c:
            #设置session中存储的数据
            request.session["is_login"] = True
            request.session["username"] = user
            #尤其注意跳转到哪个页面！！！
            return render(request,"index.html",{"username":user})
        else:
            msg = "用户名或密码错误"
            return redirect("/login.html",{"msg":msg})