django(一)验证码

这里讲讲在django中使用第三方插件验证码的流程。

一、先安装pillow, 通过 python -m pip install pillow

二、安装完后，在官方网站上看操作过程。地址：pillow.readthedocs.io/en/

三、视图部分逻辑代码--

1、验证码部分 ( 注意：验证码要用全局变量来使得后期可以和输入的值进行验证）

def verifycode(request):
    from PIL import Image, ImageDraw, ImageFont
    import random

    #background
    bgColor = (random.randrange(50,100),random.randrange(50,100),random.randrange(50,100))

    #hight and length
    width = 100
    height = 25

    #create a canvas
    image = Image.new('RGB',(width,height),bgColor)

    #
    #font = ImageFont.truetype('FreeMono.ttf',24)
    #create a pen
    draw = ImageDraw.Draw(image)

    #create a global empty string for verify code
    global textTemp

    textTemp=''
    #create char
    for i in range(4):
        textTemp1 = text[random.randrange(0, len(text))]
        textTemp += textTemp1
        draw.text((i*25,0) ,
                  #text[random.randrange(0,len(text))]
                  textTemp1 ,
                  (255,255,255),
                  )
    request.session['code']=textTemp
    #draw.text((0,0),text,(255,255,255))

    #save
    from io import BytesIO as StringIO
    buf = StringIO()
    image.save(buf,'png')

    #output to clinet

    return HttpResponse(buf.getvalue(),'image/png')

2、表格页面一的视图逻辑

def verifyTest1(request):
    return render(request, 'booktest/verifyTest1.html')

3、验证输入的视图逻辑

def verifyTest2(request):
       code = request.POST['code']
       if( code == textTemp ):
           return HttpResponse('You got it')
       return HttpResponse('False')

四、创建模板

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<image src="/booktest/verifycode"></image><br>
<form action="verifyTest1" method="post">
    {% csrf_token %}
    <input type="text" name ="code1">
    <input type="submit" name="submit">
</form>
</body>
</html>

#创建模板如果把 “form” 写成 “from” 就没法跳转了

五、创建url

  url(r'^verifycode/$', views.verifycode),
  url(r'^verifyTest1/$', views.verifyTest1),
  url(r'^verifyTest2/$', views.verifyTest2)

六、效果

当输入的验证码错误，会返回“false”。正确则返回“You got it.”