Django captcha 验证码

序

登录功能中验证码是十分重要的，在这里就简单的介绍Django中验证码的实现

安装

pip install django-simple-captcha

配置


 INSTALLED_APPS中加入captcha

 urlpatterns += patterns('',
 url(r'^captcha/', include('captcha.urls')),
 )

建立表单


from django.core.cache import cache
from django import forms
from captcha.fields import CaptchaField
class TestForm(forms.Form):
 name=forms.CharField()
 def clean_name(self):
     clean_name=self.cleaned_data['name']
     if clean_name=='shanyj':
         return clean_name
     else:
         raise forms.ValidationError("aaaa!")
class CForm(forms.Form):
 captcha = CaptchaField()

验证表单


def some_view(request):
 form2=''
 if request.POST:
     if request.POST.get('captcha_0','na')!='na':
         form1=TestForm(request.POST)
         form2=CForm(request.POST)
         if form1.is_valid() and form2.is_valid():
             cache.delete('pass')
             return HttpResponse('ok')
         else:
             try:
                 cache.incr('pass')
             except:
                 cache.set('pass',1,3600)
     else:
         form1=TestForm(request.POST)
         if form1.is_valid():
             cache.delete('pass')
             return HttpResponse('ok')
         else:
             try:
                 cache.incr('pass')
             except:
                 cache.set('pass',1,3600)
 else:
     form1=TestForm()
 if cache.get('pass')>3:
     form2=CForm()
 return render_to_response('template.html',RequestContext(request,{'form1':form1,'form':form2}))

模板显示


 { % load staticfiles % }

 < form action='.' method='POST' >{ % csrf_token % }
     { { form1 } }
     { % if form.captcha % }
     { { form.captcha } }
     { % endif % }
     < input type="submit" />
     < button class='captcha-refresh'>刷新< /button>
     { % if form.captcha.errors % }
     { { form.captcha.errors } }
     { % endif % }
 

 < script type="text/javascript" src='{ % static "js/jquery.js" % }'>
 < script type="text/javascript">
 $('.captcha-refresh').click(function(){
     form = $(this).parents('form');
     $.getJSON('/captcha/refresh/', {}, function(json) {
         $('.captcha').attr('url',json.image_url);
         $('.captcha').attr('src',json.image_url);
         $('#id_captcha_0').attr('value',json.image_url.split('/')[3]);
     });
     return false;
 });
 < /script>