#!/usr/bin/env python
# -*- coding:utf-8 -*-
import random
from PIL import Image, ImageDraw, ImageFont, ImageFilter
_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母,去除可能干扰的i,l,o,z
_upper_cases = _letter_cases.upper() # 大写字母
_numbers = ''.join(map(str, range(3, 10))) # 数字
init_chars = ''.join((_letter_cases, _upper_cases, _numbers))
def create_validate_code(size=(120, 30),
chars=init_chars,
img_type="GIF",
mode="RGB",
bg_color=(238,99,99),
fg_color=(0, 0, 255),
font_size=18,
font_type="Monaco.ttf",
length=4,
draw_lines=True,
n_line=(1, 2),
draw_points=True,
point_chance=2):
"""
@todo: 生成验证码图片
@param size: 图片的大小,格式(宽,高),默认为(120, 30)
@param chars: 允许的字符集合,格式字符串
@param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG
@param mode: 图片模式,默认为RGB
@param bg_color: 背景颜色,默认为白色
@param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF
@param font_size: 验证码字体大小
@param font_type: 验证码字体,默认为 ae_AlArabiya.ttf
@param length: 验证码字符个数
@param draw_lines: 是否划干扰线
@param n_lines: 干扰线的条数范围,格式元组,默认为(1, 2),只有draw_lines为True时有效
@param draw_points: 是否画干扰点
@param point_chance: 干扰点出现的概率,大小范围[0, 100]
@return: [0]: PIL Image实例
@return: [1]: 验证码图片中的字符串
"""
width, height = size # 宽高
# 创建图形
img = Image.new(mode, size, bg_color)
draw = ImageDraw.Draw(img) # 创建画笔
def get_chars():
"""生成给定长度的字符串,返回列表格式"""
return random.sample(chars, length)
def create_lines():
"""绘制干扰线"""
line_num = random.randint(*n_line) # 干扰线条数
for i in range(line_num):
# 起始点
begin = (random.randint(0, size[0]), random.randint(0, size[1]))
# 结束点
end = (random.randint(0, size[0]), random.randint(0, size[1]))
draw.line([begin, end], fill=(0, 0, 0))
def create_points():
"""绘制干扰点"""
chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]
for w in range(width):
for h in range(height):
tmp = random.randint(0, 100)
if tmp > 100 - chance:
draw.point((w, h), fill=(0, 0, 0))
def create_strs():
"""绘制验证码字符"""
c_chars = get_chars()
strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开
font = ImageFont.truetype(font_type, font_size)
font_width, font_height = font.getsize(strs)
draw.text(((width - font_width) / 3, (height - font_height) / 3),
strs, font=font, fill=fg_color)
return ''.join(c_chars)
if draw_lines:
create_lines()
if draw_points:
create_points()
strs = create_strs()
# 图形扭曲参数
params = [1 - float(random.randint(1, 2)) / 100,
0,
0,
0,
1 - float(random.randint(1, 10)) / 100,
float(random.randint(1, 2)) / 500,
0.001,
float(random.randint(1, 2)) / 500
]
img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜,边界加强(阈值更大)
return img, strs
from django.conf.urls import url from django.contrib import admin from web import views urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^yzhome.html',views.yz_home ), url(r'^yanzheng.html',views.yanzheng ), ]
from django.shortcuts import render
from django.shortcuts import HttpResponse
from utils.check_code import create_validate_code
from django.shortcuts import redirect
from io import BytesIO
# Create your views here.
def yz_home(requset):
if requset.method=='GET':
return render(requset,'yz_home.html')
else:
return HttpResponse('ok')
def yanzheng(requset):
f=BytesIO()
img,code=create_validate_code()
requset.session['check_code']=code
img.save(f,'PNG')
return HttpResponse(f.getvalue())
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证码</title>
</head>
<body>
<form action="yz_home.html" method="POST">
<div> 用户名:<input type="text" placeholder="用户名" name="username"></div>
<div>密码:<input type="password" placeholder="密码" name="pwa"></div>
<div>验证码:<input type="text" name="yzm"></div>
<img src="/yanzheng.html" onclick="shuaxin(this);">
<div><input type="submit" value="确认"></div>
<script src="/static/js/jquery-1.12.4.js">
</script>
<script>
function shuaxin(ths){
{# ths.src = ths.src + "?"#}
var i =$(ths).prop("src")
$(ths).prop("src",i+"?")
}
</script>
</form>
</body>
</html>
<img src="/yanzheng.html" onclick="shuaxin(this);">
<script>
function shuaxin(ths){
ths.src = ths.src + "?"
}
</script>
<img src="/yanzheng.html" onclick="shuaxin(this);">
<script src="/static/js/jquery-1.12.4.js">
</script>
<script>
function shuaxin(ths){
var i =$(ths).prop("src")
$(ths).prop("src",i+"?")
}
</script>
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