Django中login_required装饰器详细介绍

Django提供了多种装饰器，其中login_required可以被频繁使用。以下是使用此装饰器的四种方法。

当然，使用前记得在项目目录下的Settings.py中设置LOGIN_URL

使用方法

1。 URLconf 中的装饰

from django.contrib.auth.decorators import login_required, permission_required
from django.views.generic import TemplateView

from .views import VoteView

urlpatterns = [
 url(r'^about/', login_required(TemplateView.as_view(template_name="secret.html"))),
 url(r'^vote/', permission_required('polls.can_vote')(VoteView.as_view())),
]

2.基于功能的视图的装饰

from django.contrib.auth.decorators import login_required
from django.http import HttpResponse

@login_required
def my_view(request):
 if request.method == 'GET':
  # <view logic>
  return HttpResponse('result')

3。装饰类视图

from django.contrib.auth.decorators import login_required
from django.utils.decorators import method_decorator
from django.views.generic import TemplateView

class ProtectedView(TemplateView):
 template_name = 'secret.html'

 @method_decorator(login_required)
 def dispatch(self, *args, **kwargs):
  return super(ProtectedView, self).dispatch(*args, **kwargs)

4。通过Mixin类继承实现装饰

from django.contrib.auth.decorators import login_required

from django.http import HttpResponseRedirect
from django.shortcuts import render
from django.views.generic import View

from .forms import MyForm

class LoginRequiredMixin(object):
 @classmethod
 def as_view(cls, **initkwargs):
  view = super(LoginRequiredMixin, cls).as_view(**initkwargs)
  return login_required(view)

class MyFormView(LoginRequiredMixin, View):
 form_class = MyForm
 initial = {'key': 'value'}
 template_name = 'form_template.html'

 def get(self, request, *args, **kwargs):
  form = self.form_class(initial=self.initial)
  return render(request, self.template_name, {'form': form})
 
 def post(self, request, *args, **kwargs):
  # code here

Django用户登录访问限制@login_required

在网站开发过程中，我们经常会遇到这样的需求：用户登录系统只有在访问某些页面之前，如果用户没有登录直接访问，会跳转到登录界面。

其实很容易实现这样一个要求：

1。在对应的视图方法前添加django自带的装饰器@login_required

2.在settings.py中配置LOGIN_URL参数

3.更改login.html表单中的action参数

# views.py
from djanco.contrib.auth.decorators import login_required
from django.shortcuts import render_to_response

@login_required
def index(request):
return render_to_response('index.html')

# settings.py
....
LOGIN_URL = '/accounts/login/' # 根据你网站的实际登陆地址来设置
....

如果想使用Django的默认登录地址，可以在urls.py中添加此配置：

# urls.py
....
url(r'^accounts/login/', views.login),
....

# login.html
<div class="container">
<form class="form-signin" action="/accounts/login/" method="post">
{% csrf_token %}
<!--csrf_token：生成令牌-->
<h2 class="form-signin-heading" align="center">登录系统</h2>
<label for="inputUsername" class="sr-only">username</label>
<input type="text" name="username" id="inputUsername" class="form-control" placeholder="username" required autofocus>
<label for="inputPassword" class="sr-only">Password</label>
<input type="password" name="password" id="inputPassword" class="form-control" placeholder="Password" required>
<div class="checkbox">
<label>
<input type="checkbox" value="remember-me"> 记住密码
</label>
</div>
<br />
<button class="btn btn-lg btn-primary btn-block" type="submit">登录</button>
<br />
<span style="color: red;">{{ login_err }}</span>
</form>
</div>
<!-- /container -->