Python-web开发验证码的制作

一、安装依赖包Pillow

pip install Pillow

二、验证码一般是放在一个项目的工具方法中

三、验证码的代码

#!/usr/bin/env python# encoding: utf-8from random import randint,choicefrom PIL import Image,ImageDraw,ImageFontfrom cStringIO import StringIOfrom string import printabledef pillow_test():    #设置选用的字体    font_path = "utils/captcha/font/Arial.ttf"    font_color = (randint(150, 200), randint(0, 150), randint(0, 150))    line_color = (randint(0, 150), randint(0, 150), randint(150, 200))    point_color = (randint(0, 150), randint(50, 150), randint(150, 200))    #设置验证码的宽与高    width, height = 100, 34    image = Image.new("RGB",(width, height),(200,200,200))    font = ImageFont.truetype(font_path,height - 10)    draw = ImageDraw.Draw(image)    #生成验证码    text = "".join([choice(printable[:62]) for i in xrange(4)])    font_width, font_height = font.getsize(text)    #把验证码写在画布上    draw.text((10, 10), text, font=font, fill=font_color)    #绘制干扰线    for i in xrange(0, 5):        draw.line(((randint(0, width), randint(0, height)),                   (randint(0, width), randint(0, height))),                  fill=line_color, width=2)    # 绘制点    for i in xrange(randint(100, 1000)):        draw.point((randint(0, width), randint(0, height)), fill=point_color)    #输出    out = StringIO()    image.save(out, format='jpeg')    content = out.getvalue()    out.close()    return text, content

四、创建一个视图返回验证码(基于tornado)

#获取图像验证码class TestHandler(BaseHandler):    def get(self):        text, img = pillow_test()        #设置头信息        self.set_header("Content-Type", "image/jpg")        self.write(img)

五、直接在前端页面中的img中使用这个视图