生成隨機驗證碼圖片

• 安裝 PIL模塊

  • pip3 install pillow

• 生成 圖片

from PIL import Image
img = Image.new(mode='RGB',size=(120,30),color=(0,255,255))

# 查看 圖片
# img.show()

# 保存 圖片 到本地

with open('code.png','wb') as f:
    img.save(f,format='png')

• 創建畫筆，在圖片上畫內容

from PIL import Image,ImageDraw

img = Image.new(mode='RGB',size=(120,30),color=(0,255,255))

draw = ImageDraw.Draw(img,mode='RGB')

# 畫點
draw.point([100,10],fill='red')
draw.point([100, 20], fill='red')
draw.point([100, 25], fill='red')

# 畫線
draw.line((10,10,100,20),fill=(255,0,255))

# 畫圓
draw.arc((0,0,30,20),0,360,fill='red')

# 寫文字
draw.text([0,0],'python','red') 


# 加入特殊字體
from PIL import ImageFont
font = ImageFont.truetype('kumo.ttf',28)

draw.text([0,0],'python','red'，font=font) 

• 上面 是把生成寫入本地 這種方法是不好的，應該把這個圖片寫入到內存裏

from PIL import Image,ImageDraw,ImageFont

from io import BytesIO

f = BytesIO()

img = Image.new(mode='RGB',size=(120,30),color=(0,255,255))

draw = ImageDraw.Draw(img,mode='RGB')

# .......

img.save(f,'png')
# 取圖片
data = f.getvalue()

• 生成隨機驗證碼圖片

# views.py
def check_code(request):

    from io import BytesIO
    from utils.random_check_code import rd_check_code
    img,code = rd_check_code()
    stream = BytesIO()
    img.save(stream,'png')
    request.session['code'] = code

    return HttpResponse(stream.getvalue())


# random_check_code.py
from PIL import Image,ImageDraw,ImageFont,ImageFilter
import random

def rd_check_code(width=120, height=30, char_length=5, font_file='kumo.ttf', font_size=28):
    code = []
    img = Image.new(mode='RGB', size=(width, height), color=(255, 255, 255))
    draw = ImageDraw.Draw(img, mode='RGB')

    def rndChar():
        """
        生成隨機字母   
        :return:
        """
        return chr(random.randint(65, 90))

    def rndColor():
        """
        生成隨機顏色
        :return:
        """
        return (random.randint(0, 255), random.randint(10, 255), random.randint(64, 255))

    # 寫文字
    font = ImageFont.truetype(font_file, font_size)
    for i in range(char_length):
        char = rndChar()
        code.append(char)
        h = random.randint(0, 4)
        draw.text([i * width / char_length, h], char, font=font, fill=rndColor())

    # 寫干擾點
    for i in range(40):
        draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())

    # 寫干擾圓圈
    for i in range(40):
        draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())
        x = random.randint(0, width)
        y = random.randint(0, height)
        draw.arc((x, y, x + 4, y + 4), 0, 90, fill=rndColor())

    # 畫干擾線
    for i in range(5):
        x1 = random.randint(0, width)
        y1 = random.randint(0, height)
        x2 = random.randint(0, width)
        y2 = random.randint(0, height)

        draw.line((x1, y1, x2, y2), fill=rndColor())

    img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
    return img,''.join(code)