#!/usr/bin/env python#coding=utf-8import randomfrom PIL import Image, ImageDraw, ImageFont, ImageFilter_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小寫字母，去除可能干擾的i，l，o，z_upper_cases = _letter_cases.upper() # 大寫字母_numbers = ''.join(map(str, range(3, 10))) # 數字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="ae_AlArabiya.ttf",             length=4,             draw_lines=True,             n_line=(1, 2),             draw_points=True,             point_chance = 2):  '''  @todo: 生成驗證碼圖片  @param size: 圖片的大小，格式（寬，高），默認為(120, 30)  @param chars: 允許的字符集合，格式字符串  @param img_type: 圖片保存的格式，默認為GIF，可選的為GIF，JPEG，TIFF，PNG  @param mode: 圖片模式，默認為RGB  @param bg_color: 背景顏色，默認為白色  @param fg_color: 前景色，驗證碼字符顏色，默認為藍色#0000FF  @param font_size: 驗證碼字體大小  @param font_type: 驗證碼字體，默認為 ae_AlArabiya.ttf  @param length: 驗證碼字符個數  @param draw_lines: 是否劃干擾線  @param n_lines: 干擾線的條數范圍，格式元組，默認為(1, 2)，只有draw_lines為True時有效  @param draw_points: 是否畫干擾點  @param point_chance: 干擾點出現的概率，大小范圍[0, 100]  @return: [0]: PIL Image實例  @return: [1]: 驗證碼圖片中的字符串  '''  width, height = size # 寬， 高  img = Image.new(mode, size, bg_color) # 創建圖形  draw = ImageDraw.Draw(img) # 創建畫筆  def get_chars():    '''生成給定長度的字符串，返回列表格式'''    return random.sample(chars, length)  def create_lines():    '''繪制干擾線'''    line_num = random.randint(*n_line) # 干擾線條數    for i in range(line_num):      # 起始點      begin = (random.randint(0, size[0]), random.randint(0, size[1]))      #結束點      end = (random.randint(0, size[0]), random.randint(0, size[1]))      draw.line([begin, end], fill=(0, 0, 0))  def create_points():    '''繪制干擾點'''    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():    '''繪制驗證碼字符'''    c_chars = get_chars()    strs = ' %s ' % ' '.join(c_chars) # 每個字符前后以空格隔開    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()  # 圖形扭曲參數  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) # 創建扭曲  img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 濾鏡，邊界加強（閾值更大）  return img, strsif __name__ == "__main__":  code_img = create_validate_code()  code_img.save("validate.gif", "GIF")

try:  import cStringIO as StringIOexcept ImportError:  import StringIOmstream = StringIO.StringIO()img = create_validate_code()[0]img.save(mstream, "GIF") 

from django.conf.urls.defaults import *urlpatterns = patterns('example.views',  url(r'^validate/$', 'validate', name='validate'),)

from django.shortcuts import HttpResponsefrom validate import create_validate_codedef validate(request):  mstream = StringIO.StringIO()  validate_code = create_validate_code()  img = validate_code[0]  img.save(mstream, "GIF")  request.session['validate'] = validate_code[1]  return HttpResponse(mstream.getvalue(), "image/gif")