Create a login app

python manage.py startapp login

Add app

settings.py

INSTALLED_APPS = [
    'login',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]

Write html file

templates/login/login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>高考推荐系统登录</title>
</head>
<body>
<form action="" method="post">
  <p>username: <input type="text" name="username" /></p>
  <p>password: <input type="text" name="password" /></p>
  <input type="submit" value="登录" />
</form>
</body>
</html>

templates/login/register.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册界面</title>
</head>
<body>
    <h1>注册界面</h1>
    <form action="" method="post">
        用户名：<input type="text" name="username"><br>
        密码：<input type="password" name="password"><br>
        确认密码：<input type="password" name="re_password"><br>
        <input type="submit" value="注册">
    </form>
</body>
</html>

Create a database

from django.db import models


class User(models.Model):
    username = models.CharField(max_length=20, unique=True)
    password = models.CharField(max_length=20)

    def __str__(self):
        return self.username

Database Migration

python manage.py makemigrations login
python manage.py migrate

Create a view

Import the render django.shortcuts from, the HttpResponse, the redirect 
from the User login.models Import 
from django.views.decorators.csrf Import csrf_exempt 
@csrf_exempt 
DEF Login (Request): 
    # Request This request is sent to the front end of the request, carries all data, django gave us deal with some of the columns, packaged as an object pass over 
    # is actually very simple, learn to use it to give you some ways like, in fact, you also think of how it is handled. 
    request.method == IF 'the GET': 
        return the render (Request, 'Login / the login.html') 
    IF request.method == 'the POST': 
        username = request.POST.get ( 'username') 
        password of request.POST = .get ( 'password') 
        USER_OBJ = User.objects.filter (username = username, password = password) .first () 
        IF USER_OBJ:
            return HttpResponse('登陆成功')
            return HttpResponse('用户名或密码错误')


@csrf_exempt
def register(request):
    if request.method == 'GET':
        return render(request, 'login/register.html')
    if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        re_password = request.POST.get('re_password')
        if username and password and re_password:
            if password == re_password:
                user_obj = User.objects.filter(username=username).first()
                if user_obj:
                    return HttpResponse ( 'user already exists')
                the else: 
                    User.objects.create (username = username, password = password) .save ()
                    return redirect('/login/')
            else:
                return HttpResponse ( 'two passwords do not match') 
        the else: 
            return HttpResponse ( 'not free!')

Creating urls

from django.urls import path

from . import views

urlpatterns = [
    path('', views.login, name='login'),
    path('register', views.register, name='register'),
    ]

Creating overall routing file

urls.py

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('login/', include('login.urls')),
]

Administrator Management (optional)

from django.contrib import admin
from .models import User
# Register your models here.
admin.site.register(User)

Adding superuser

python manage.py createsuperuser

127.0.0.1:8000/admin

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