urls.py 檔案設定：

views.py檔案設定：

from functools import wraps
def check_login(func):
    @wraps(func)    #裝飾器修復技術
    def inner(request,*args,**kwargs):
        ret= request.get_signed_cookie("is_login",default="0",salt="zhangces123")
        if ret== "1":
            return func(request,*args,**kwargs)
        else:
 

            next_url =request.path_info
            return  redirect("/login/?next={}".format(next_url))
    return inner


def login(request):
    if request.method == "POST":
        user = request.POST.get("user")
        password = request.POST.get("pwd")
 # 從url中獲取到next引數
        next_url = request.GET.get("next")             這是在post請求中 獲取get請求的資料 所以要在修改html的action資訊
 

        print(next_url)
        if user == "alex" and password == "123456":
if next_url:      #如果有next_url  就跳轉到next_url頁面
                ret=redirect(next_url)
            else:    #沒有就跳轉到home頁面
                ret = redirect("/home/")
            # ret.set_cookie("is_login","1")  這是設定不加鹽的cookie
            # 設定加鹽的cookie
            ret.set_signed_cookie("is_login","1",salt="zhangces123")    #salt:加鹽
            return ret
    return render(request,"login.html")

@check_login
def index(request):
    return render(request,"index.html")

login.html頁面：

<form action="{{ request.get_full_path }}" method="post">    #這裡的action資訊 要麼為空  要麼是request.get_full_path