• python添加图片验证码


    1.创建验证码模块

    #!/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=(255, 255, 255),
                             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
    check_code.py

    2.前端

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .form{
                height: 200px;
                width: 400px;
                border: 1px solid gray;
                top: 40%;
                left: 50%;
                position: absolute;
                margin-left: -200px;
                margin-top: -100px;
            }
            .c1{
                margin: 0 auto;
            }
            .f1{
                width: 100px;
                height: 200px;
                position: relative;
                top: 40%;
                left: 50%;
                margin-left: -75px;
                margin-top: -90px;
            }
    
        </style>
    </head>
    <body>
        <div class="form">
            <form class="f1" action="/login/" method="post">
                <p><input class="" type="text" PLACEHOLDER="用户名"></p>
                <p><input class="" type="password" placeholder="密码"></p>
                <p><input type="text" name="check_code" placeholder="验证码"><img src="/check_code.html"></p>
                <p><button>提交</button></p>
            </form>
        </div>
    </body>
    </html>
    login.html

    3.views函数

    from django.shortcuts import render, HttpResponse
    
    # Create your views here.
    from app01 import models
    from io import BytesIO
    from .check_code import create_validate_code
    
    def login(request):
        if request.method == "POST":
            code = request.POST.get('check_code')
            if code.upper() == request.session['CheckCode'].upper():
                print('验证码正确')
            else:
                print('验证码错误')
        return render(request, 'login.html')
    
    def check_code(request):
        """
        验证码
        :param request:
        :return:
        """
        # stream = BytesIO()
        # img, code = create_validate_code()
        # img.save(stream, 'PNG')
        # request.session['CheckCode'] = code
        # return HttpResponse(stream.getvalue())
    
        # data = open('static/imgs/avatar/20130809170025.png','rb').read()
        # return HttpResponse(data)
    
        # 1. 创建一张图片 pip3 install Pillow
        # 2. 在图片中写入随机字符串
        # obj = object()
        # 3. 将图片写入到制定文件
        # 4. 打开制定目录文件,读取内容
        # 5. HttpResponse(data)
    
        stream = BytesIO()
        img, code = create_validate_code()
        img.save(stream,'PNG')
        request.session['CheckCode'] = code
        return HttpResponse(stream.getvalue())
    View Code

    4.url路由

    urlpatterns = [
        path('login/', views.login),
        path('check_code.html', views.check_code),
    ]
    View Code
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  • 原文地址:https://www.cnblogs.com/ttyypjt/p/10256696.html
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