django 使用装饰器验证用户登陆

def checkLogin(func):
    def wrapper(request,*args,**kwargs):
        is_login=request.session.get('Is_Login',False)
        if is_login:
            return func(request,*args,**kwargs) #此处一定要有return,否则会报返回为空的错误.
        else:
            return  redirect('/Index/')
    return  wrapper

login 模块

def login_user(request):
    if request.method == 'POST':
        form = LoginForm(request.POST)
        if form.is_valid():
            all_data = form.clean()   #获取post数据，例如 {'username': u'yang1', 'password': 111}
            exist = User.objects.filter(username = all_data['Form_username'],password = all_data['Form_password']).first()
            if exist:
                request.session['Is_Login'] = True  #设置session的随机字段值
                request.session['username'] = exist.username   #设置uname字段为登录用户
                return redirect('/index/')
            else:
                return HttpResponse("账户或密码错误")
    else:
        form = LoginForm()
    return render(request, 'login.html', {'form': form})
 
@checkLogin
def home(request):
        username = request.session.get('uname', False)   #获取登录用户名
        return render(request, home.html', {'username': username}) #用户名渲染到前端页面