Django用户注册、登录、注销（一）

使用Django自带的用户认证系统编写认证、登录、注销基本功能

功能：

使用Django默认的User表

1）注册

　　判断是否已存在此用户，存在的话提示报错“用户已存在”；

　　判断两次输入的密码是否一致，不一致的话提示报错“密码不一致”。

　实现报错提示的方式有两种：

　　第一种：在form表单中使用clean_函数进行定义判断函数，在views中进行的is_valid（）判断时进行校验，并获取错误传送到模板中显示在前端。

　　第二种：直接在views视图中判断

2）登录

　　登录成功，跳转到主页index；

　　登录不成功，初始化登录页面；

　　跳转到注册页面。

3）主页

　　直接访问主页，用户没有登录的话跳转到登录页面；　

　　用户已登录显示用户登录名。

4）注销

　　清除登录的session，退出登录

项目目录结构：

mysite/setting设置

注册应用：

更改时区和语言设置

from django.contrib import admin
from django.urls import path
from django.conf.urls import url,include
urlpatterns = [path('admin/', admin.site.urls),url(r'^djauth/',include('djauth.urls',namespace='djauth')),]

mysite/urls.py

from django.urls import re_path
from . import views
app_name='djauth'
urlpatterns=[re_path(r'^$',views.index),re_path(r'register/$',views.register,name="register"),re_path(r'login/$',views.login_view,name="login"),re_path(r'logout/$',views.logout_view,name="logout"),
]

djauth/urls.py

from django import forms
from django.contrib.auth.models import User
class login_form(forms.Form):username=forms.CharField(max_length=30)password=forms.CharField(widget=forms.PasswordInput)class register_form(forms.Form):username=forms.CharField(max_length=30,label="姓名")email=forms.EmailField()password=forms.CharField(widget=forms.PasswordInput,min_length=3,label="密码")password_re=forms.CharField(widget=forms.PasswordInput,min_length=3,label="确认密码")#第一种报错方式，使用form表单，views中捕捉##clean_字段,,在视图views使用is_valid时自动严重表单字段的有效性# def clean_username(self):#     cd=self.cleaned_data#     user=User.objects.filter(username=cd['username'])#     if user:#         raise forms.ValidationError('用户已存在')#     return cd['username']# def clean_password_re(self):#     cd=self.cleaned_data#     if cd['password']!=cd['password_re']:#         raise forms.ValidationError("密码不一致")#     return cd['password_re']

djauth/forms.py

from django.shortcuts import render,redirect,reverse
from django.http import HttpResponse
import time
from django.contrib import auth
from django.contrib.auth.models import User
from . import forms#访问index首页前先判断用户是否登录，没有登录的话需要跳转到login登录
#实现方式一：判断request.user.is_authenticated
# def index(request):
#     #验证用户是否登录成功
#     if  request.user.is_authenticated:
#         # request.user.username；；获取登录用户名
#         print("UserAuth:",request.user.username)
#         return render(request,"djauth/index.html")
#     else:
#         return redirect("/djauth/login/")
#实现方式二：使用@login_required装饰器
#login_required装饰器会先判断用户是否登录，如果没有登录则自动跳转到login_url路径，
#默认跳转路径是/accounts/login/，并在登录后跳转到原先的请求路径；如请求路径/djauth、，
#默认跳转路径为/accounts/login/?next=/djauth/#示例：
#没有login_url
#[13/Dec/2018 14:40:16] "GET /djauth/ HTTP/1.1" 302 0
#302跳转
#[13/Dec/2018 14:40:16] "GET /accounts/login/?next=/djauth/ HTTP/1.1"
#指定loging_url
#[13/Dec/2018 14:41:31] "GET /djauth/ HTTP/1.1" 302 0
#[13/Dec/2018 14:41:32] "GET /djauth/login/?next=/djauth/ HTTP/1.1" 200 725
#[13/Dec/2018 14:42:35] "POST /djauth/login/?next=/djauth/ HTTP/1.1" 302 0
#302登录成功后自动跳转
#[13/Dec/2018 14:42:35] "GET /djauth/ HTTP/1.1" 200 263
from django.contrib.auth.decorators import login_required
@login_required(login_url="/djauth/login/")
def index(request):return render(request,"djauth/index.html")def register(request):errors=[]if request.method=='POST':#初始化表单RegisterForm=forms.register_form(request.POST)#验证表单的输入是否有效，格式是否正确if RegisterForm.is_valid():# 第一种报错方式，捕捉form表单的报错##获取表单有效的值# Register=RegisterForm.cleaned_data##创建用户# user=User.objects.create_user(username=Register['username'],#                               password=Register['password'],#                               email=Register['email']#                               )##保存# user.save()# return HttpResponse("注册成功")##获取form表单clean函数中raise的错误#errors=RegisterForm.errors#第二种报错方式，直接在views中判断Register=RegisterForm.cleaned_data#判断用户是否存在user_exist=User.objects.filter(username=Register['username']).exists()if user_exist:errors.append("用户已存在")if Register['password']!=Register['password_re']:errors.append("密码不一致")else:user=User.objects.create_user(username=Register['username'],password=Register['password'],email=Register['email'])user.save()return HttpResponse("注册成功")#初始化表单RegisterForm=forms.register_form()return render(request,"djauth/register.html",{"RegisterForm":RegisterForm,"errors":errors})def login_view(request):error=[]curtime=time.strftime("%Y-%m-%d %H:%M:%S",time.localtime())if request.method=='POST':LoginForm=forms.login_form(request.POST)if LoginForm.is_valid():Account=LoginForm.cleaned_data#验证User表中用户的账号密码是否正确，验证通过，返回用户名，不通过，返回Noneuser=auth.authenticate(username=Account['username'],password=Account['password'])if user is not None:#判断账户是否活跃if user.is_active:auth.login(request,user)return redirect("/djauth/")else:error.append("用户无效")else:error.append("账号或密码错误")else:LoginForm=forms.login_form()return render(request,'djauth/login.html',{"LoginForm":LoginForm,"curtime":curtime,"error":error})def logout_view(request):#清除session，登出
    auth.logout(request)return redirect("/djauth/login")

djauth/views.py

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>{% block title %}{% endblock %}</title>
</head>
<body>
{% block content %}{% endblock %}
</body>
</html>

djauth/templates/djauth/base.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>首页</title>
</head>
<body>
<h1>首页</h1>
<!--获取登录用户名:request.user.username或user.username-->
{% if request.user.is_authenticated %}{{ user.username }}
{% endif %}<p><a href="{% url 'djauth:logout' %}">退出</a></p>
</body>
</html>

djauth/templates/djauth/index.html

{% extends "djauth/base.html" %}{% block title %}
Login Page
{% endblock %}{% block content %}
<h1>Login Page</h1>{% if error %}{{ error }}{% endif %}<p>时间:{{ curtime }}</p><form action="" method="post">{% csrf_token %}{{ LoginForm.as_p }}<input type="submit" value="Login"></form><p>没有账号？点击<a href="{% url 'djauth:register' %}">注册</a></p>
{% endblock %}

djauth/templates/djauth/login.html

{% extends "djauth/base.html" %}
{% block title %}
Register Page
{% endblock %}{% block content %}
<h1>Register Page</h1>{% if errors %}<p>{{ errors }}</p>{% endif %}<form action="" method="post">{% csrf_token %}{% for foo in RegisterForm %}<p>{{ foo.label_tag }}{{ foo }} {{ errors.foo }}</p>{% endfor %}<input type="submit" value="注册"></form>
{% endblock %}