基于Django的python验证码(实例讲解)

from django.http import HttpResponse
def verifycode(request):
 #引入绘图模块
 from PIL import Image, ImageDraw, ImageFont
 #引入随机函数模块
 import random
 #定义变量，用于画面的背景色、宽、高
 bgcolor = (random.randrange(20, 100), random.randrange(
  20, 100), 255)
 width = 100
 height = 25
 #创建画面对象
 im = Image.new('RGB', (width, height), bgcolor)
 #创建画笔对象
 draw = ImageDraw.Draw(im)
 #调用画笔的point()函数绘制噪点
 for i in range(0, 100):
  xy = (random.randrange(0, width), random.randrange(0, height))
  fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
  draw.point(xy, fill=fill)
 #定义验证码的备选值
 str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
 #随机选取4个值作为验证码
 rand_str = ''
 for i in range(0, 4):
  rand_str += str1[random.randrange(0, len(str1))]
 #构造字体对象
 font = ImageFont.truetype('FreeMono.ttf', 23)
 #构造字体颜色
 fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
 #绘制4个字
 draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
 draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
 draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
 draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
 #释放画笔
 del draw
 #存入session，用于做进一步验证
 request.session['verifycode'] = rand_str
 #内存文件操作
 import io
 buf = io.StringIO()
 #将图片保存在内存中，文件类型为png
 im.save(buf, 'png')
 #将内存中的图片数据返回给客户端，MIME类型为图片png
 return HttpResponse(buf.getvalue(), 'image/png')

from . import viewsUtil

urlpatterns = [
 url(r'^verifycode/$', viewsUtil.verifycode),
]

<img id='verifycode' src="/verifycode/" alt="CheckCode"/>

<script type="text/javascript" src="/static/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
  $(function(){
    $('#verifycodeChange').css('cursor','pointer').click(function() {
      $('#verifycode').attr('src',$('#verifycode').attr('src')+1)
    });
  });
</script>
<img id='verifycode' src="/verifycode/?1" alt="CheckCode"/>
<span id='verifycodeChange'>看不清，换一个</span>

<form method='post' action='/verifycodeValid/'>
  <input type="text" name="vc">
  <img id='verifycode' src="/verifycode/?1" alt="CheckCode"/>
<span id='verifycodeChange'>看不清，换一个</span>
<br>
<input type="submit" value="提交">
</form>

from django.http import HttpResponse

def verifycodeValid(request):
  vc = request.POST['vc']
  if vc.upper() == request.session['verifycode']:
    return HttpResponse('ok')
  else:
    return HttpResponse('no')

urlpatterns = [
  url(r'^verifycodeValid/$', views.verifycodeValid),
]