python之页面验证码

一，准备阶段

　　安装pillow 模块

pip install pillow

二，使用

from PIL import Image, ImageDraw,ImageFont
from io import BytesIO
import random

def get_valid_img(request):

    # 生成随机颜色
    def get_random_color():
        return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))

    image = Image.new("RGB", (200, 35), get_random_color())

    # 生成随机字符
    draw = ImageDraw.Draw(image)
    font = ImageFont.truetype("./static/font/kumo.ttf", size=25)
    print(font,"font")
    temp = []
    for i in range(5):
        random_num = str(random.randint(0, 9))
        random_low = chr(random.randint(97, 122))
        random_upper_alpha = chr(random.randint(65, 90))
        random_char = random.choice([random_num, random_low, random_upper_alpha])
        draw.text((30 + i * 30, 3), random_char, get_random_color(), font=font)

        temp.append(random_char)


        # 噪点噪线
        width=100
        height=40
        for i in range(1):
            x1=random.randint(0,width)
            x2=random.randint(0,width)
            y1=random.randint(0,height)
            y2=random.randint(0,height)
            draw.line((x1,y1,x2,y2),fill=get_random_color())

        for i in range(1):
            draw.point([random.randint(0, width), random.randint(0, height)], fill=get_random_color())
            x = random.randint(0, width)
            y = random.randint(0, height)
            draw.arc((x, y, x + 4, y + 4), 0, 90, fill=get_random_color())

    # 在内存中生成图片
    
    f = BytesIO()
    image.save(f, "png")
    data = f.getvalue()
    f.close()

    temp_str = "".join(temp)
   # 存入session中方便在其他视图函数中验证 
    request.session["temp_str"] = temp_str

    return HttpResponse(data)

html

　　<h1>验证码</h1>
　　<img  id="valid_img" src="/get_valid_img" alt="验证码加载异常" height="50px" width="300px">
　　# 点击刷新验证码
　　<script>
　　　　$("#valid_img").cilck(function(){
　　　　　　$(this)[0].src=$(this)[0].src+"？"

})


    </script>

url.py

　　url(r'^get_valid_img', views.get_valid_img)

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