from django.http import HttpResponse
def verifycode(request):
 #引入繪圖模塊
 from PIL import Image, ImageDraw, ImageFont
 #引入隨機(jī)函數(shù)模塊
 import random
 #定義變量，用于畫面的背景色、寬、高
 bgcolor = (random.randrange(20, 100), random.randrange(
  20, 100), 255)
 width = 100
 height = 25
 #創(chuàng)建畫面對(duì)象
 im = Image.new('RGB', (width, height), bgcolor)
 #創(chuàng)建畫筆對(duì)象
 draw = ImageDraw.Draw(im)
 #調(diào)用畫筆的point()函數(shù)繪制噪點(diǎn)
 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)
 #定義驗(yàn)證碼的備選值
 str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
 #隨機(jī)選取4個(gè)值作為驗(yàn)證碼
 rand_str = ''
 for i in range(0, 4):
  rand_str += str1[random.randrange(0, len(str1))]
 #構(gòu)造字體對(duì)象
 font = ImageFont.truetype('FreeMono.ttf', 23)
 #構(gòu)造字體顏色
 fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
 #繪制4個(gè)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)
 #釋放畫筆
 del draw
 #存入session，用于做進(jìn)一步驗(yàn)證
 request.session['verifycode'] = rand_str
 #內(nèi)存文件操作
 import io
 buf = io.StringIO()
 #將圖片保存在內(nèi)存中，文件類型為png
 im.save(buf, 'png')
 #將內(nèi)存中的圖片數(shù)據(jù)返回給客戶端，MIME類型為圖片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，換一個(gè)</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，換一個(gè)</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),
]