Django登录部分(Django login part)

 我现在正在使用Django框架的系统。 我正在编写用户登录部分。 它似乎很成功，但效果不佳。 
 
 
 
 登录系统可以通过他/她的用户名和密码识别用户。 
 
 
 身份验证只能持续一个“网页”。 当我加载另一个页面甚至重新加载页面时，django无法获取用户的信息（似乎已注销） 
 
 
 如果我查看了页面资源，我看到了登录过程后创建的会话号。 
 
 
 我该怎么做才能确保只需要一次登录？ 并让我的用户在整个过程中登录？ 
 
 这是我的视图文件 
 
from django.shortcuts import render
from django.http import HttpResponse,HttpResponseRedirect
from django.template import RequestContext, loader
from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.contrib.auth import authenticate, login, logout
from django.shortcuts import render_to_response,redirect
from django.template import RequestContext
from django.views.decorators.csrf import csrf_exempt
from django.template.context_processors import csrf
from . import models
from . import form as f
from django.contrib.sessions.backends.db import SessionStore

def index(request):
    if request.user != None :
        template = loader.get_template('index.html')
        return HttpResponse(template.render(None))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def Home(request):
    template = loader.get_template('Home.html')
    return HttpResponse(template.render(None))  

def loggin_in(request):
    c = {}
    c.update(csrf(request))
    return render_to_response('login.html', c)

def login_user(request):
    logout(request)
    username = password = ''
    if request.POST:
        username = request.POST.get('username','')
        password = request.POST.get('password','')
        user = authenticate(username=username, password=password)
        if user is not None:
            if user.is_active:
                login(request, user)
                request.session['username']=user.username



                return HttpResponseRedirect('/PDT/logged_successful')
            return HttpResponseRedirect('/PDT/inactive')
        return HttpResponseRedirect('/PDT/incorrect')
    return HttpResponseRedirect('/PDT/login_failed')

def logged_in(request):
    if request.user :
        return render_to_response('index.html',{ 'user' : request.user },context_instance=RequestContext(request))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def login_failed(request):
    return render_to_response('problem.html',{ 'message' : "Login failed" })

def log_out(request):
    request.session.flush()
    logout(request)
    return render_to_response('problem.html',{ 'message' : "Logged out" })

def inactive(request):
    return render_to_response('problem.html',{ 'message' : "Inactive" })

def incorrect(request):
    return render_to_response('problem.html',{ 'message' : "Incorrect Username or Password" })

def iter_update(request):
    if request.session['username'] != None :
        return render_to_response('iter_update.html',{ 'user' : request.user },context_instance=RequestContext(request))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def Create_form(request):
    if request.method == "POST":

        form = f.ProjectForm(request.POST)

        if(form.is_valid()):
            print(request.POST['title'])
            form.save()
            message = 'success'
        else:
            message = 'fail'

        return render_to_response('Create_form.html',
              {'message': message,
              'user': request.user,},
              context_instance=RequestContext(request))
    else:
        return render_to_response('Create_form.html',
                {'form': f.ProjectForm()},
                context_instance=RequestContext(request))

I am now working on a system using the Django framework. I am writing the user login part. It seems successful but it doesn't work very well. 
 
 
 
The login system can recognise the user by his/her username and password.
 
 
The authentication could only last for one "webpage". When I loaded another page or even reloaded the page, django can't get the info of the user(seems logged out)
 
 
If I looked at the page resources, I saw a session number made after the login process.
 
 
What should I do to ensure only one login is needed? And keep my user logged in during the whole process?
 
Here is my view file
 
from django.shortcuts import render
from django.http import HttpResponse,HttpResponseRedirect
from django.template import RequestContext, loader
from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.contrib.auth import authenticate, login, logout
from django.shortcuts import render_to_response,redirect
from django.template import RequestContext
from django.views.decorators.csrf import csrf_exempt
from django.template.context_processors import csrf
from . import models
from . import form as f
from django.contrib.sessions.backends.db import SessionStore

def index(request):
    if request.user != None :
        template = loader.get_template('index.html')
        return HttpResponse(template.render(None))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def Home(request):
    template = loader.get_template('Home.html')
    return HttpResponse(template.render(None))  

def loggin_in(request):
    c = {}
    c.update(csrf(request))
    return render_to_response('login.html', c)

def login_user(request):
    logout(request)
    username = password = ''
    if request.POST:
        username = request.POST.get('username','')
        password = request.POST.get('password','')
        user = authenticate(username=username, password=password)
        if user is not None:
            if user.is_active:
                login(request, user)
                request.session['username']=user.username



                return HttpResponseRedirect('/PDT/logged_successful')
            return HttpResponseRedirect('/PDT/inactive')
        return HttpResponseRedirect('/PDT/incorrect')
    return HttpResponseRedirect('/PDT/login_failed')

def logged_in(request):
    if request.user :
        return render_to_response('index.html',{ 'user' : request.user },context_instance=RequestContext(request))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def login_failed(request):
    return render_to_response('problem.html',{ 'message' : "Login failed" })

def log_out(request):
    request.session.flush()
    logout(request)
    return render_to_response('problem.html',{ 'message' : "Logged out" })

def inactive(request):
    return render_to_response('problem.html',{ 'message' : "Inactive" })

def incorrect(request):
    return render_to_response('problem.html',{ 'message' : "Incorrect Username or Password" })

def iter_update(request):
    if request.session['username'] != None :
        return render_to_response('iter_update.html',{ 'user' : request.user },context_instance=RequestContext(request))
    else :
        return HttpResponseRedirect('/PDT/login_failed')

def Create_form(request):
    if request.method == "POST":

        form = f.ProjectForm(request.POST)

        if(form.is_valid()):
            print(request.POST['title'])
            form.save()
            message = 'success'
        else:
            message = 'fail'

        return render_to_response('Create_form.html',
              {'message': message,
              'user': request.user,},
              context_instance=RequestContext(request))
    else:
        return render_to_response('Create_form.html',
                {'form': f.ProjectForm()},
                context_instance=RequestContext(request))

原文：https://stackoverflow.com/questions/33890467