登录后台逻辑二

将上文中用函数实现逻辑改为用类实现。
增加form验证功能

用类实现

views.py完整代码：

# -*- coding: utf-8 -*-from django.shortcuts import renderfrom django.contrib.auth import authenticate, loginfrom django.contrib.auth.backends import ModelBackendfrom django.db.models import Qfrom django.views.generic.base import Viewfrom .models import UserProfileclass CustomBackend(ModelBackend):    def authenticate(self, 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 Noneclass LoginView(View):    def get(self, request):        return render(request, "login.html", {})    def post(self, request):            user_name = request.POST.get("username", "")            pass_word = request.POST.get("password", "")            user = authenticate(username=user_name, password=pass_word)            if user is not None:                login(request, user)                return render(request, "index.html")            else:                return render(request, "login.html", {"msg": "用户名或密码错误！"})

同时将urls.py更正：

from users.views import LoginViewurlpatterns = [   url('^$',TemplateView.as_view(template_name="index.html"), name="index"),url('^login/$', LoginView.as_view(), name="login"),]

form 验证功能

在users中新建forms.py,添加以下代码：

from django import formsclass LoginForm(forms.Form):    username = forms.CharField(required=True)    password = forms.CharField(required=True, min_length=5)

在views.py中引入form验证功能

from .forms import LoginFormclass 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", "")            pass_word = request.POST.get("password", "")            user = authenticate(username=user_name, password=pass_word)            if user is not None:                login(request, user)                return render(request, "index.html")            else:                return render(request, "login.html", {"msg": "用户名或密码错误！"})        else:            return render(request, "login.html", {"login_form":login_form})

在login.html中增加：

div class="form-group marb20 {% if login_form.errors.username %} errorput {% endif %}">                        <label>用&nbsp;户&nbsp;名</label>                        <input name="username" id="account_l" type="text" placeholder="手机号/邮箱" />                    </div>                    <div class="form-group marb8  {% if login_form.errors.password %}errorput{% endif %}">                        <label>密&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;码</label>                        <input name="password" id="password_l" type="password" placeholder="请输入您的密码" />                    </div>

<div class="error btns login-form-tips" id="jsLoginTips">{% for key,error in login_form.errors.items %}{{ error }} {% endfor %}{{ msg }}</div>