Python 如何生成包含字母和数字的图片验证码 Python源码

from flask import Flask , render_template , session ,make_response import random import string from PIL import Image, ImageFont, ImageDraw from io import BytesIO app = Flask(__name__) # 实例化Flask类 app.secret_key = "mrsoft" # 设置secret_key def rndColor(): '''随机颜色''' return (random.randint(32, 127), random.randint(32, 127), random.randint(32, 127)) def gene_text(): '''生成4位验证码''' return ''.join(random.sample(string.ascii_letters+string.digits, 4)) def draw_lines(draw, num, width, height): '''干扰线''' for num in range(num): x1 = random.randint(0, width / 2) y1 = random.randint(0, height / 2) x2 = random.randint(0, width) y2 = random.randint(height / 2, height) draw.line(((x1, y1), (x2, y2)), fill='black', width=1) def get_verify_code(): '''生成验证码图形''' code = gene_text() # 图片大小120×50 width, height = 120, 50 # 新图片对象 im = Image.new('RGB',(width, height),'white') # 字体 # font = ImageFont.truetype('app/static/fonts/arial.ttf', 40) font = ImageFont.truetype(r'C:\Windows\Fonts\SIMLI.TTF', 50) # 设置验证码字体为隶书 # draw对象 draw = ImageDraw.Draw(im) draw_lines(draw,num=5,width=200,height=50) # 绘制字符串 for item in range(4): draw.text((5+random.randint(-3,3)+23*item, 5+random.randint(-3,3)), text=code[item], fill=rndColor(),font=font ) return im, code @app.route('/login') def login(): '''登录''' return render_template("login.html") # 渲染页面 @app.route('/code') def get_code(): image, code = get_verify_code() # 图片以二进制形式写入 buf = BytesIO() image.save(buf, 'jpeg') buf_str = buf.getvalue() # 把buf_str作为response返回前端，并设置首部字段 response = make_response(buf_str) response.headers['Content-Type'] = 'image/gif' # 将验证码字符串储存在session中 session['image'] = code return response if __name__ == "__main__": app.run(debug=True) # 开启调试模式