django 的form登录 注册

 #!/usr/bin/env python
 # -*- coding: utf8 -*-
 #__Author: "Skiler Hao"
 #date: 2017/3/30 15:40
 from django.core.exceptions import ValidationError  #抛出异常
 from django import forms
 from django.forms import fields
 from django.forms import widgets   #内部有插件 用于密码什么二次验证
 from django.core.validators import RegexValidator  #定义正则表达式
 from respository import models

 class RegisterForm(forms.Form):
     username = fields.CharField(
　　　　　　 #limit_cjoices_to={"username__in":["alex","egon']}   补充##针对select的所有queryset做筛选,用于foreignkey,manaytomany字段
         required=True,
         widget=widgets.TextInput(attrs={'class': "form-control",'placeholder': '用户名为8-12个字符'}),
         min_length=6,
         max_length=12,
         strip=True,
         error_messages={'required': '标题不能为空',
                         'min_length': '用户名最少为6个字符',
                         'max_length': '用户名最不超过为20个字符'},
     )
     email = fields.EmailField(
         required=True,
         widget=widgets.TextInput(attrs={'class': "form-control",'placeholder': '请输入邮箱'}),
         strip=True,
         error_messages={'required': '邮箱不能为空',
                         'invalid':'请输入正确的邮箱格式'},
     )
     pwd = fields.CharField(
         widget=widgets.PasswordInput(attrs={'class': "form-control",'placeholder': '请输入密码，必须包含数字,字母,特殊字符'},render_value=True),
         required=True,
         min_length=6,
         max_length=12,
         strip=True,
         validators=[
             # 下面的正则内容一目了然，我就不注释了
             RegexValidator(r'((?=.*\d))^.{6,12}$', '必须包含数字'),
             RegexValidator(r'((?=.*[a-zA-Z]))^.{6,12}$', '必须包含字母'),
             RegexValidator(r'((?=.*[^a-zA-Z0-9]))^.{6,12}$', '必须包含特殊字符'),
             RegexValidator(r'^.(\S){6,10}$', '密码不能包含空白字符'),
         ], #用于对密码的正则验证
         error_messages={'required': '密码不能为空!',
                         'min_length': '密码最少为6个字符',
                         'max_length': '密码最多不超过为12个字符!',},
     )
     pwd_again = fields.CharField(
         #render_value会对于PasswordInput，错误是否清空密码输入框内容，默认为清除，我改为不清楚
         widget=widgets.PasswordInput(attrs={'class': "form-control",'placeholder': '请再次输入密码!'},render_value=True),
         required=True,
         strip=True,
         error_messages={'required': '请再次输入密码!',}

     )

     def clean_username(self):
         # 对username的扩展验证，查找用户是否已经存在
         username = self.cleaned_data.get('username')
         users = models.User.objects.filter(username=username).count()
         if users:
             raise ValidationError('用户已经存在！')
         return username

     def clean_email(self):
         # 对email的扩展验证，查找用户是否已经存在
         email = self.cleaned_data.get('email')
         email_count = models.User.objects.filter(email=email).count() #从数据库中查找是否用户已经存在
         if email_count:
             raise ValidationError('该邮箱已经注册！')
         return email

     def _clean_new_password2(self): #查看两次密码是否一致
         password1 = self.cleaned_data.get('pwd')
         password2 = self.cleaned_data.get('pwd_again')
         if password1 and password2:
             if password1 != password2:
                 # self.error_dict['pwd_again'] = '两次密码不匹配'
                 raise ValidationError('两次密码不匹配！')

     def clean(self):
         #是基于form对象的验证，字段全部验证通过会调用clean函数进行验证
         self._clean_new_password2() #简单的调用而已

 class loginForm(forms.Form):
     username = fields.CharField(
         required=True,
         widget=widgets.TextInput(attrs={'class': "form-control",'placeholder': '请输入用户名'}),
         min_length=6,
         max_length=12,
         strip=True,
         error_messages={'required': '用户名不能为空',}
     )

     pwd = fields.CharField(
         widget=widgets.PasswordInput(attrs={'class': "form-control",'placeholder': '请输入密码'}),
         required=True,
         min_length=6,
         max_length=12,
         strip=True,
         error_messages={'required': '密码不能为空!',}
     )

     def clean(self):
         username = self.cleaned_data.get('username')
         pwd = self.cleaned_data.get('pwd')
         user = models.User.objects.filter(username=username).first()
         if username and pwd:
             if not user :

                 # self.error_dict['pwd_again'] = '两次密码不匹配'
                 raise ValidationError('用户名不存在！')
             elif pwd != user.password:
                 raise ValidationError('密码不正确！')

 forms.py