python图片验证码生成代码

 #!/usr/bin/env python # -*- coding: UTF-8 -*- import random from PIL import Image, ImageDraw, ImageFont, ImageFilter try: import cStringIO as StringIO except ImportError: import StringIO _letter_cases = "abcdefghjkmnpqrstuvwxy"            # 小写字母 _upper_cases = "ABCDEFGHJKLMNPQRSTUVWXY"            # 大写字母 _numbers = "1234567890"                     # 数字 init_chars = ''.join((_letter_cases, _upper_cases, _numbers))  # 生成允许的字符集合 default_font = "./DejaVuSans.ttf"                # 验证码字体 # 生成验证码接口 def generate_verify_image(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=default_font, length=4, draw_lines=True, n_line=(1, 2), draw_points=True, point_chance=2, save_img=False): """ 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 DejaVuSans.ttf :param length: 验证码字符个数 :param draw_lines: 是否划干扰线 :param n_line: 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] :param save_img: 是否保存为图片 :return: [0]: 验证码字节流, [1]: 验证码图片中的字符串 """ width, height = size # 宽， 高 img = Image.new(mode, size, bg_color) # 创建图形 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 xrange(width): for h in xrange(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） mstream = StringIO.StringIO() img.save(mstream, img_type) if save_img: img.save("validate.gif", img_type) return mstream, strs if __name__ == "__main__": mstream, strs = generate_verify_image(save_img=True) print strs