验证码实现

Posted 2021-01-20 ziyun20160613

yanzhengma.html:

<form>
<img src="{% url ‘yanzhengma_code‘ %}" onclick="this.src=this.src+‘?‘+Math.random()">
验证码：<input type="" name=""><br>
<button>提交</button>
</form>

 

路由urls.py

url(r‘^yanzhengma/$‘,views.yanzhengma),
url(r‘^yanzhengmacode/$‘,views.yanzhengmacode,name=‘yanzhengma_code‘)

 

def yanzhengma(request):
return render(request,‘myhome/yanzhengma.html‘)

 

views.py:

def yanzhengmacode(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‘
str1 = ‘123456789‘
#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.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‘)