安裝

pip install pillow

代碼貼圖

import os
import string
import random
# Image:是一個畫板(context)  ImageDraw:是一個畫筆  ImageFont:畫筆的字體
from PIL import Image, ImageDraw, ImageFont


class Captcha:
    # 字體的路徑
    font_path = os.path.join(os.path.dirname(__file__), 'NuevaStd-Italic.otf')
    # 驗證碼位數(shù)
    number = 4
    # 驗證碼尺寸(寬高)
    size = (120, 48)
    # 背景顏色，默認為白色 rgb(red,green,blue)
    bg_color = (12, 12, 12)
    # 隨機字體顏色
    font_color = (random.randint(230, 255), random.randint(200, 255), random.randint(100, 255))
    # 驗證碼字體大小
    font_size = 36
    # 隨機干擾線顏色。
    line_color = (random.randint(123, 250), random.randint(100, 200), random.randint(0, 100))
    # 是否繪制干擾線
    is_draw_line = True
    # 是否繪制干擾點
    is_draw_point = True
    # 干擾線的數(shù)量
    line_number = 5

    # 生成 a~zA~Z1~9 字符串
    SOURCE = list(string.ascii_letters)
    for index in range(1, 10):
        SOURCE.append(str(index))

    @classmethod
    def gene_text(cls):
        """
        用來隨機生成一個字符串(包括英文和數(shù)字)
        :return:  text  返回文本
        """
        # number是生成驗證碼的位數(shù)
        text = ''.join(random.sample(cls.SOURCE, cls.number))
        return text

    @classmethod
    def __gene_line(cls, draw, width, height):
        """繪制干擾線"""
        begin = (random.randint(0, width), random.randint(0, height))
        end = (random.randint(0, width), random.randint(0, height))
        draw.line([begin, end], fill=cls.line_color)

    @classmethod
    def __gene_points(cls, draw, point_chance, width, height):
        """繪制干擾點"""
        # 大小限制在[0, 100]
        chance = min(100, max(0, int(point_chance)))
        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))

    @classmethod
    def gene_code(cls):
        """
        繪制圖形驗證碼
        :return:  [text, image]
        """
        # 寬和高
        width, height = cls.size
        # 創(chuàng)建圖片
        image = Image.new('RGBA', (width, height), cls.bg_color)
        # 驗證碼的字體
        font = ImageFont.truetype(cls.font_path, cls.font_size)
        # 創(chuàng)建畫筆
        draw = ImageDraw.Draw(image)
        # 生成驗證碼字符串
        text = cls.gene_text()
        # 獲取字體寬高
        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.font_color)
        # 如果需要繪制干擾線
        if cls.is_draw_line:
            # 遍歷 line_number 次, 就是畫l ine_number 根線條
            for x in range(0, cls.line_number):
                cls.__gene_line(draw, width, height)
        # 如果需要繪制噪點
        if cls.is_draw_point:
            cls.__gene_points(draw, 10, width, height)
        return [text, image]

渲染在頁面上

Flask 實現(xiàn)

import flask
from io import BytesIO
from utils.captcha.captcha import Captcha


def graph_captcha():
    #  生成驗證碼
    text,image = Captcha.gene_code()
    # BytesIO 相當(dāng)于一個管道
    out = BytesIO()
    # 把image塞到BytesIO這個管道中
    image.save(out,'png')
    # 指針指向開始的地方 0
    out.seek(0)

    # 創(chuàng)建一個response響應(yīng)對象， out.read是把圖形讀出來
    response = flask.make_response(out.read())
    # 指定響應(yīng)的類型
    response.content_type = 'image/png'
    return response

Django 實現(xiàn)

from django.http import HttpResponse
from io import BytesIO
from utils.captcha.captcha import Captcha


def graph_captcha(request):
    # 生成驗證碼
    captcha, image = Captcha.gene_code()
    # BytesIO 相當(dāng)于一個管道
    out = BytesIO()
    # 創(chuàng)建一個response響應(yīng)對象， out.read是把圖形讀出來
    image.save(out, 'png')
    # 指針指向開始的地方 0
    out.seek(0)

    response = HttpResponse(content_type="image/png")
    response.write(out.read())
    return response