python 中文验证码

# -*- coding: utf-8 -*-
import Image,ImageDraw,ImageFont
import random
import math, string  

class RandomChar():
  """用于随机生成汉字"""
  @staticmethod
  def Unicode():
    val = random.randint(0x4E00, 0x9FBF)
    return unichr(val)  

  @staticmethod
  def GB2312():
    head = random.randint(0xB0, 0xCF)
    body = random.randint(0xA, 0xF)
    tail = random.randint(0, 0xF)
    val = ( head << 8 ) | (body << 4) | tail
    str = "%x" % val
    return str.decode('hex').decode('gb2312')  

class ImageChar():
  def __init__(self, fontColor = (0, 0, 0),
                     size = (100, 40),
                     fontPath = 'wqy.ttc',
                     bgColor = (255, 255, 255),
                     fontSize = 20):
    self.size = size
    self.fontPath = fontPath
    self.bgColor = bgColor
    self.fontSize = fontSize
    self.fontColor = fontColor
    self.font = ImageFont.truetype(self.fontPath, self.fontSize)
    self.image = Image.new('RGB', size, bgColor)  

  def rotate(self):
    self.image.rotate(random.randint(0, 30), expand=0)  

  def drawText(self, pos, txt, fill):
    draw = ImageDraw.Draw(self.image)
    draw.text(pos, txt, font=self.font, fill=fill)
    del draw  

  def randRGB(self):
    return (random.randint(0, 255),
           random.randint(0, 255),
           random.randint(0, 255))  

  def randPoint(self):
    (width, height) = self.size
    return (random.randint(0, width), random.randint(0, height))  

  def randLine(self, num):
    draw = ImageDraw.Draw(self.image)
    for i in range(0, num):
      draw.line([self.randPoint(), self.randPoint()], self.randRGB())
    del draw  

  def randChinese(self, num):
    gap = 5
    start = 0
    for i in range(0, num):
      char = RandomChar().GB2312()
      x = start + self.fontSize * i + random.randint(0, gap) + gap * i
      self.drawText((x, random.randint(-5, 5)), RandomChar().GB2312(), self.randRGB())
      self.rotate()
    self.randLine(18)  

  def save(self, path):
    self.image.save(path)