from PIL import Image from PIL import ImageDraw from PIL import ImageFont import random class ValidCodeImg: def __init__(self,width=150,height=45,code_count=5,font_size=32,point_count=20,line_count=3,img_format='png'): ''' 能够生成一个通过降噪后的随机验证码的图片 :param width: 图片宽度 单位px :param height: 图片高度 单位px :param code_count: 验证码个数 :param font_size: 字体大小 :param point_count: 噪点个数 :param line_count: 划线个数 :param img_format: 图片格式 :return 生成的图片的bytes类型的data ''' self.width = width self.height = height self.code_count = code_count self.font_size = font_size self.point_count = point_count self.line_count = line_count self.img_format = img_format @staticmethod def getRandomColor(): '''获取一个随机颜色(r,g,b)格式的''' c1 = random.randint(0,255) c2 = random.randint(0,255) c3 = random.randint(0,255) return (c1,c2,c3) @staticmethod def getRandomStr(): '''获取一个随机字符串,每一个字符的颜色也是随机的''' random_num = str(random.randint(0, 9)) random_low_alpha = chr(random.randint(97, 122)) random_upper_alpha = chr(random.randint(65, 90)) random_char = random.choice([random_num, random_low_alpha, random_upper_alpha]) return random_char def getValidCodeImg(self): # 获取一个Image对象,参数分别是RGB模式。宽150,高30,随机颜色 image = Image.new('RGB',(self.width,self.height),self.getRandomColor()) # 获取一个画笔对象,将图片对象传过去 draw = ImageDraw.Draw(image) # 获取一个font字体对象参数是ttf的字体文件的目录,以及字体的大小 font=ImageFont.truetype('RomanT.ttf', size=self.font_size) temp = [] for i in range(self.code_count): # 循环5次,获取5个随机字符串 random_char = self.getRandomStr() # 在图片上一次写入获得的随机字符串,参数是:定位,字符串,颜色,字体 draw.text((10+i*30, 5),random_char , self.getRandomColor(), font=font) # 保存随机字符,以供验证用户输入的验证码是否正确时使用 temp.append(random_char) valid_str = "".join(temp) # 噪点噪线 # 划线 for i in range(self.line_count): x1=random.randint(0,self.width) x2=random.randint(0,self.width) y1=random.randint(0,self.height) y2=random.randint(0,self.height) draw.line((x1,y1,x2,y2),fill=self.getRandomColor()) # 画点 for i in range(self.point_count): draw.point([random.randint(0, self.width), random.randint(0, self.height)], fill=self.getRandomColor()) x = random.randint(0, self.width) y = random.randint(0, self.height) draw.arc((x, y, x + 4, y + 4), 0, 90, fill=self.getRandomColor()) # 在内存生成图片 from io import BytesIO f = BytesIO() image.save(f, self.img_format) data = f.getvalue() f.close() return data,valid_str if __name__ == '__main__': img = ValidCodeImg() data, valid_str = img.getValidCodeImg() print(valid_str) f = open('test.png', 'wb') f.write(data)
data是二进制,str是随机字符串。前端
前端图片实现点击切换只要绑定一个点击事件,app
函数:dom
<img onclick='function(this);’>ide
function(ths){函数
ths.src=ths.src+'?';字体
}this