python---验证码

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#查看系统安装的字体的位置sudo find / -name '*.ttf'from django.http import HttpResponsefrom io import BytesIO
from PIL import Image, ImageDraw, ImageFont

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) height = 30 width = height*4 #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)) draw.point(xy,fill=random_color()) #定义验证码的备选值 str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0' #随机选取4个值作为验证码 checkcode = '' for i in range(0, 4): checkcode += str1[random.randint(0,len(str1)-1)] #构造字体对象 font = ImageFont.truetype('DejaVuSerif.ttf',18) #构造字体颜色 draw.text((height*i+7,5),checkcode[i],font=font,fill=random_color()) #绘制4个字 for i in range(0,4): draw.text((height*i+7,5),checkcode[i],font=font,fill=random_color()) #释放画笔 del draw #存入session，用于做进一步验证 request.session['verifycode'] = checkcode #内存文件操作 from io import BytesIO buf = BytesIO() #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')#随机颜色def random_color(): return (255,random.randrange(0,255),random.randrange(0,255))
#验证码def verifycode(request): bgcolor = (random.randrange(20,101),random.randrange(20,101),random.randrange(101,255)) height = 35 width = height*4 im = Image.new('RGB',(width,height),bgcolor) draw = ImageDraw.Draw(im) for i in range(200): xy = (random.randrange(0,width),random.randrange(0,height)) draw.point(xy,fill=random_color()) str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0' checkcode = '' for i in range(0,4): checkcode += str1[random.randint(0,len(str1)-1)] font = ImageFont.truetype('DejaVuSerif.ttf',18) for i in range(0,4): draw.text((height*i+7,5),checkcode[i],font=font,fill=random_color()) del draw request.session['verifycode'] = checkcode buf = BytesIO() im.save(buf,'png') return HttpResponse(buf.getvalue(),'image/png')
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