Flask 验证码点击验证码刷新

时间 2019-12-08

原文原文链接

---恢复内容开始---javascript

import random
import string
# Image:一个画布
# ImageDraw:一个画笔
# ImageFont:画笔的字体

# pip install pillow
from PIL import Image, ImageDraw, ImageFont


class Captcha(object):
    # 生成几位数的验证码
    number = 4
    # 验证码图片的高度和宽度
    size = (100, 30)
    # 验证码字体大小
    fontsize = 25
    # 加入干扰线条数
    line_number = 2

    # 构建一个验证码源文本
    SOURCE = list(string.ascii_letters)
    for index in range(0, 10):
        SOURCE.append(str(index))

    # 用来绘制干扰线
    @classmethod
    def __gene_line(cls, draw, width, height):
        begin = (random.randint(0, width), random.randint(0, height))
        end = (random.randint(0, width), random.randint(0, height))
        draw.line([begin, end], fill=cls.__gene_random_color(), width=2)

    # 用来绘制干扰点
    @classmethod
    def __gene_points(cls, draw, point_chance, width, height):
        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=cls.__gene_random_color())

    # 生成随机的颜色
    @classmethod
    def __gene_random_color(cls, start=0, end=255):
        random.seed()
        return (random.randint(start, end), random.randint(start, end), random.randint(start, end))

    # 随机选择一个字体
    @classmethod
    def __gene_random_font(cls):
        fonts = [

            'Lobster-Regular.ttf',
            'verdana.ttf'
        ]
        font = random.choice(fonts)
        return font

    # 用来随机生成一个字符串
    @classmethod
    def gene_text(cls, number):
        # num是生成验证码的位数
        return ''.join(random.sample(cls.SOURCE, number))

    # 生成验证码
    @classmethod
    def gene_graph_captcha(cls):
        # 验证码图片的高和宽
        width, height = cls.size
        # 建立图片
        image = Image.new('RGBA', (width, height), cls.__gene_random_color(0, 100))
        # 验证码的字体
        font = ImageFont.truetype(cls.__gene_random_font(), cls.fontsize)
        # font = ImageFont.truetype(cls.__gene_random_font(), cls.fontsize)
        # 建立画笔
        draw = ImageDraw.Draw(image)
        # 生成字符串
        text = cls.gene_text(cls.number)
        # 获取字体尺寸
        font_width, font_height = font.getsize(text)
        # 填充字符串
        draw.text(((width - font_width) / 2, (height - font_height) / 2), text, font=font,
                  fill=cls.__gene_random_color(150, 255))
        # 绘制干扰线
        for x in range(0, cls.line_number):
            cls.__gene_line(draw, width, height)
        # 绘制噪点
        cls.__gene_points(draw, 10, width, height)
        return (text, image)





from flask import make_response
from flask import Flaskfrom io import BytesIO
from flask import render_template


app = Flask(__name__)


@app.route('/')
def index():
    return render_template('login.html')


@app.route('/ver_image_code')
def graph_captcha():
    text, image = Captcha.gene_graph_captcha()
    out = BytesIO()
    image.save(out, 'png')
    out.seek(0)
    resp = make_response(out.read())
    resp.content_type = 'image/png'
return resp


if __name__ == '__main__':
    app.run()

---恢复内容结束---html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title>    <style>        <!--        样式-- >        .captcha-addon {            padding: 0;            /*/ / 这是内边距为0，由于input-group-addon有设置内边距 overflow: hidden;*/            /*/ / 当里面的元素超出则隐藏*/        }        #captcha-img {            height: 32px;            /*/ / 设置图片的高度为32px cursor: pointer;*/            /*/ / 当鼠标移到图片上变成手的图标*/        }    </style></head><body><div class="input-group">    <input type="text" class="form-control" name="graph_captcha" placeholder="图形验证码">    <span class="input-group-addon captcha-addon"> <!--加了一个类captcha-addon-->                 <img id="captcha-img" name="captcha-img" src="/ver_image_code/1" onclick="get_src()">        <!--加了id aptcha-img-->    </span></div><script src="{{ url_for('static', filename='jquery-3.3.1.js') }}"></script><script type="text/javascript">    function get_src() {        var img = document.getElementById("captcha-img");        img.src = "http://127.0.0.1:5000/ver_image_code/" + Math.random();    }</script></body></html>

Flask 验证码 点击验证码刷新

Flask 验证码点击验证码刷新