登陆功能的实现

1.在urls.py 文件里面：

url(r'^login/$', LoginView.as_view(), name='login'),

2.在views.py 文件里面：

from django.contrib.auth import authenticate,login,logout

from django.views.generic.base import View

from .forms import LoginForm

'''登陆'''
class LoginView(View):
    def get(self,request):
        return render(request,'login.html',)
    def post(self,request):
        login_form = LoginForm(request.POST)
        if login_form.is_valid():

            user_name = request.POST.get('username', None)
            pass_word = request.POST.get('password', None)
            user = authenticate(username=user_name, password=pass_word)
            if user is not None:

                if user.is_active:
                    login(request, user)
                    return render(request, 'index.html')
                else:
                    content = {
                        'msg': u'用户未激活',
                    }
                    return render(request, 'login.html', content)
            else:
                content = {
                    'msg': u'用户名或则密码不正确',
                }
                return render(request,'login.html',content)
        else:
            content =  {
                 # 'msg': u'用户名或则密码不正确',
                'login_form':login_form,
            }

　　return render(request,'login.html',content)

from django.contrib.auth.backends import ModelBackend

from django.db.models import Q

'''一个账号多样式登陆'''
class CustomBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            user = UserProfile.objects.get(Q(username=username)|Q(email=username))
            if user.check_password(password):
                return user
        except Exception as e:
            return None

2-1.在settings里面：

AUTHENTICATION_BACKENDS = (
    'users.views.CustomBackend',
)

3.在templates 文件里面找到login.html文件：

找到表单数据，在form里面加入： action="{% url 'login' %}" method="post"
在表单结尾之前加入：{% csrf_token %}
注意，表单里面的name属性要和views.py文件里面要传递的属性要相同
判断返回页面的样式，是否显示的是登陆状态，

{% if request.user.is_authenticated %}
...

{% else %}
...

{% endif %}


4.对login.html的post提交的表单经行验证是否合法

在app下面新建一个form.py文件

from django import forms

class LoginForm(forms.Form):
    username = forms.CharField(required=True,max_length=100)
    password = forms.CharField(required=True,min_length=6,max_length=16)

5.在login.html里面：
在username的字段经行判断 ：

{% if login_form.errors.password %}errorput{% endif %}
新建一个div 来放置报错信息：

{% for key,error in login_form.errors.items%}{{ error }}{% endfor %}{{ msg }}

转载于:https://www.cnblogs.com/chenyang13677/p/7771247.html