基于Django的python验证码(实例讲解)

from django.http import HttpResponsedef 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 viewsUtilurlpatterns = [ url(r'^verifycode/$', viewsUtil.verifycode),]

<img id='verifycode' src="/verifycode/"  $(function(){    $('#verifycodeChange').css('cursor','pointer').click(function() {      $('#verifycode').attr('src',$('#verifycode').attr('src')+1)    });  });</script><img id='verifycode' src="/verifycode/?1"  <input type="text" name="vc">  <img id='verifycode' src="/verifycode/?1"  vc = request.POST['vc']  if vc.upper() == request.session['verifycode']:    return HttpResponse('ok')  else:    return HttpResponse('no')

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