urls.py 文件设置：

views.py文件设置：

from functools import wraps
def check_login(func):
    @wraps(func)    #装饰器修复技术
    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")
        # 从url中获取到next参数
        next_url = request.GET.get("next")             这是在post请求中 获取get请求的数据 所以要在修改html的action信息
        print(next_url)
        if user == "alex" and password == "123456":
            if next_url:      #如果有next_url  就跳转到next_url页面
                ret=redirect(next_url)
            else:    #没有就跳转到home页面
                ret = redirect("/home/")
            # ret.set_cookie("is_login","1")  这是设置不加盐的cookie
            # 设置加盐的cookie
            ret.set_signed_cookie("is_login","1",salt="zhangces123")    #salt:加盐
            return ret
    return render(request,"login.html")

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

login.html页面：

<form action="{{ request.get_full_path }}" method="post">    #这里的action信息 要么为空  要么是request.get_full_path