python3 简单验证码的实现
视图
views.py
#验证码
def verify_code(request):
#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，ubuntu的字体路径为“/usr/share/fonts/truetype/freefont”
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(python2)
#import cStringIO
#buf = cStringIO.StringIO()
#内存文件操作(python3)
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')
#调用验证码
def verify_show(request):
return render(request,'verify_show.html')
模板
templates (html)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证码</title>
<script src="/static/js/jquery-1.12.4.min.js"></script>
<script>
$(function () {
// 添加点击事件 鼠标浮动时变成小手
$('#change').css('cursor','pointer').click(function () {
// 获取到图片的src路径 换一个新的路径 此代码相当与在原来的基础上增加数据
$('#yzm').attr('src',$('#yzm').attr('src')+'?1')
})
})
</script>
</head>
<body>
<form method="post" action="{% url 'booktest:verify_yz' %}">
{%csrf_token%}
<input type="text" name="yzm">
<img id="yzm" src="{% url 'booktest:verify_code' %}"/>
{# 这种方法是整个页面刷新 不好用#}
{# <span id="change"><a href="/booktest/verify_show" style="text-decoration:none">看不清楚，换一个</a></span>#}
<span id="change">看不清，换一个</span>
<br>
<input type="submit" value="提交">
</form>
</body>
</html>
验证
def verify_yz(request):
yzm = request.POST.get('yzm')
verifycode = request.session['verifycode']
response = HttpResponse('NO------------------------')
if yzm == verifycode:
response = HttpResponse('OK-------------------------------')
return response
