Django 1.5.4 专题六 login 和 logout

login()

在view中使用来登录用户。参数包括一个HttpRequest对象和一个User对象。login() 将用户ID保存到session中（使用Django session framework）。

注意：当用户登陆后对于匿名session的任何数据设置都会保留在session中

首先调用authenticate()
如果你自己写代码，一定要确保首先调用authenticate()，然后再调用login()。 authenticate() 会设置User的一个属性来通知认证后台该用户已经成功认证（具体参见：backends documentation），这个属性信息在后续的login处理中需要。因此，如果你直接调用login就会抛出异常。

如何登出How to log a user out

logout()

通过 django.contrib.auth.login()登录的用户登出时要在view中使用django.contrib.auth.logout() 。使用HttpRequest对象为参数，无返回值。例如：

注意：logout()不会抛出异常，即使用户并没有登录。

当调用logout()时，当前请求的session数据会彻底清空。如果你需要在用户登出后使用session中的数据，务必在调用django.contrib.auth.logout()后在设置

一.修改settings.py的APPS的内容如下



二.修改django_test/urls.py的内容如下

from django.conf.urls import patterns, include, url

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    # Examples:
    (r'^articles/',include('article.urls')),
    url(r'^hello/$','article.views.hello'),
    url(r'^hello_template_simple/$','article.views.hello_template_simple'),
    # url(r'^$', 'django_test.views.home', name='home'),
    # url(r'^django_test/', include('django_test.foo.urls')),

    # Uncomment the admin/doc line below to enable admin documentation:
    # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
    url(r'^admin/', include(admin.site.urls)),

    # user auth urls
    url(r'^accounts/login/$','django_test.views.login'),
    url(r'^accounts/auth/$','django_test.views.auth_view'),
    url(r'^accounts/logout/$','django_test.views.logout'),
    url(r'^accounts/loggedin/$','django_test.views.loggedin'),
    url(r'^accounts/invalid/$','django_test.views.invalid_login'),
    url(r'^accounts/register/$','django_test.views.register_user'),
    url(r'^accounts/register_success/$','django_test.views.register_success'),
    
)

三.修改django_test/views.py的内容如下

from django.shortcuts import render_to_response
from django.http    import HttpResponseRedirect,HttpResponse
from django.contrib import auth
from django.core.context_processors import csrf
from django.contrib.auth.forms import UserCreationForm
from datetime import datetime

def login(request):
    c=  {}
    c.update(csrf(request))
    return render_to_response('login.html',c)
def auth_view(request):
    username=request.POST.get('login','')
    password=request.POST.get('password','')
    user=auth.authenticate(username=username,password=password)
    if user is not None:
        auth.login(request,user)
        return HttpResponseRedirect('/accounts/loggedin')
    else:
        return HttpResponseRedirect('/accounts/invalid')
def loggedin(request):
    return render_to_response('loggedin.html',
            {'full_name':request.user.username})
def invalid_login(request):
    return render_to_response('invalid_login.html')
def logout(request):
    auth.logout(request)
    return render_to_response('logout.html')
def register_user(request):
    if request.method =='POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirct('/accounts/register_success')
    args={}
    args.update(csrf(request))
    args['form']=UserCreationForm()
    return render_to_response('register.html',args)
def register_success(request):
    return render_to_response('register_success.html')

四.修改django_test/templates/login.html的内容如下

{% extends "base.html" %}

{% block content %}

    {% if form.errors %}
        <p class="error">Sorry. that's not a valid username or password </p>
    {% endif %}

    <form action="/accounts/auth/" method="post">{% csrf_token %}
        <label for="username">User name:</label>
        <input type="text" name="username" value="" id="username">
        <label for="password">Password:</label>
        <input type="password" name="password" value="" id="password">

        <input type="submit" value="login">
    </form>

{% endblock %}

五.修改django_test/templates/loggedin.html的内容如下

{% extends "base.html" %}

{% block content %}
    <h2>Hi {{full_name}} you are now Logged in!</h2>
    <p>Click <a href="/accounts/logout/">here</a> to logout.  </p>
{% endblock %}

六.修改django_test/templates/register.html的内容如下

{% extends "base.html" %}
{% block content %}
    <h2>Register</h2>
    <form action="/accounts/register/" method="post">
        {{form}}
        <input type="submit" value="Register" />
    </form>
{% endblock %}

六.修改django_test/templates/invalid.html的内容如下

{% extends "base.html" %}

{% block content %}
    <h2>Your login details are invalid!</h2>
    <p>Click <a href="/accounts/login/">here</a>to login again.  </p>
{% endblock %}

七.修改django_test/templates/register_success.html的内容如下

{% extends "base.html" %}
{% block content %}
    <h2>You have registered!</h2>
    <p>Click <a href="/accounts/login/">here</a> to login again </p>
{% endblock %}