图片验证码

生成验证码代码

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from PIL import Image,ImageDraw,ImageFont,ImageFilter

import random


def check_code(width=120, height=30, char_length=5, font_file='Monaco.ttf', font_size=28):
    code = []
    img = Image.new(mode='RGB', size=(width, height), color=(255, 255, 255))
    draw = ImageDraw.Draw(img, mode='RGB')

    def rndChar():
        """
        生成随机字母
        :return:
        """
        return chr(random.randint(65, 90))

    def rndColor():
        """
        生成随机颜色
        :return:
        """
        return (random.randint(0, 255), random.randint(10, 255), random.randint(64, 255))

    # 写文字
    font = ImageFont.truetype(font_file, font_size)
    for i in range(char_length):
        char = rndChar()
        code.append(char)
        h = random.randint(0, 4)
        draw.text([i * width / char_length, h], char, font=font, fill=rndColor())

    # 写干扰点
    for i in range(40):
        draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())

    # 写干扰圆圈
    for i in range(40):
        draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())
        x = random.randint(0, width)
        y = random.randint(0, height)
        draw.arc((x, y, x + 4, y + 4), 0, 90, fill=rndColor())

    # 画干扰线
    for i in range(5):
        x1 = random.randint(0, width)
        y1 = random.randint(0, height)
        x2 = random.randint(0, width)
        y2 = random.randint(0, height)

        draw.line((x1, y1, x2, y2), fill=rndColor())

    img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
    return img, ''.join(code)
# if __name__ == '__main__':
#     image_object,code = check_code()
    # print(code)
    # # with open('code.png', 'wb') as f:
    # #     image_object.save(f,format='png')
    # from io import BytesIO
    # stream = BytesIO()
    # image_object.save(stream,'png')
    # stream.getvalue()

把图片存在内存中,并在session中设置超时时间,更新的话可以写个script让原地址url加上个?没请求一次url变一次相当于重新请求

def image_code(request):
    '''生成图片验证码'''
    from utils.image_code import check_code
    from io import BytesIO
    # # 把图片写到内存中
    image_object,code = check_code()
    stream = BytesIO()
    image_object.save(stream,'png')
    request.session['image_code'] = code
    # 超时时间60s
    request.session.set_expiry(60)

    return HttpResponse(stream.getvalue())

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