验证码生成-蒲公英云

视图函数里

1,导入图片，画布，画笔，画笔上的字体，定义坐标
2，从外部导入字体（字体导入到static静态中）
3，随机生成验证码，验证码颜色，验证码背景，给验证码加干扰点
4，清理垃圾
5，把验证码导入到对应的页面上
6, 验证码更新策略（浏览器在处理图片地址设置的时候，如果图片地址没有改变，
而内容发生了改变，浏览器不会认为发生了改变，导致图片不能正常刷新）

解决图片更新问题方案，在地址最后拼接时间戳
验证使用的session缓存的验证码

import random
from PIL import Image, ImageDraw, ImageFont
from django.http import HttpResponse
from django.shortcuts import render, redirect
# Create your views here.
# timestamp参数是定义的时间戳
def getVerifyCode(request, timestamp):
    # 绘制验证码，画布，画笔，画笔字体
    imageMode = 'RGB'
    imageSize = (100, 50)
    red = random.randrange(0, 255)
    green = random.randrange(0, 255)
    blue = random.randrange(0, 255)
    imageColor = (red, green, blue)
    # 画布完成 imageMode画布颜色 imageSize画布大小
    image = Image.new(imageMode, imageSize, imageColor)
    # 画笔
    imageDrwaw = ImageDraw.Draw(image)
    # 文本坐标
    xy = (10, 10)
    # 导入字体 （）字体路径，字体大小
    imageFont = ImageFont.truetype('static/fonts/ADOBEARABIC-BOLD.OTF', 30)
    # 随机生成四个大写字母
    verifyCode = ''
    for i in range(4):
        num = random.randrange(65, 91)
        letter = chr(num)
        verifyCode += letter
    # 把当下的四个随机数的数字赋给session
    request.session["verifycode"] = verifyCode
    x = 5
    # 验证码的颜色
    for l in verifyCode:
        fred = random.randrange(0, 255)
        fgreen = random.randrange(0, 255)
        fblue = random.randrange(0, 255)
        fontColor = (fred, fgreen, fblue)
        # 验证码的位置
        xy = (x, 10)
        x += 20
        imageDrwaw.text(xy, l, font=imageFont, fill=(0, 0, 255))
    # 验证码加点
    for i in range(300):
        x = random.randrange(0, 100)
        y = random.randrange(0, 50)
        xy = (x, y)
        pred = random.randrange(0, 256)
        pgreen = random.randrange(0, 256)
        pblue = random.randrange(0, 256)
        pColor = (pred, pgreen, pblue)
        imageDrwaw.point(xy, pColor)
    # 清理垃圾
    del imageDrwaw
    # 使用IO将画布转换成流，输出
    import io
    # 缓冲区
    buffer = io.BytesIO()
    # 将image导入到缓冲区
    image.save(buffer, 'png')
    return HttpResponse(buffer.getvalue(), 'image/png')
# 进入登录页面
def verifycode(request):
    return render(request, 'youapp/verifycode.html')
# 验证
def doverifycode(request):
    # 获取用户输入的验证码的值
    verifycode = request.POST.get('verifycode')
    # 在生成验证码的地方获取session，
    cacaverifycode = request.session.get('verifycode')
    # 判断比较
    if verifycode == cacaverifycode:
        return HttpResponse('欢迎来到王者荣耀')
    else:
        # 这里不能用重定向
        return HttpResponse('王者荣耀')
        # return redirect("/youapp/verifycode/")
# 富文本 pip install django-tinymce
def rtfblog(request):
    return render(request, 'youapp/blog.html')

在HTML页面里

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>验证码</title> {# 导入jq#} <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script> <script> $(function () { $("#ww").click(function () { {#Date.now()时间戳 #} $('#verify_img').prop("src", "http://127.0.0.1:8000/youapp/getverifycode/" + Date.now()); }) }) </script> <style> #ww { background: #00ff00; width: 100px; } </style> </head> <body> <form action="{% url 'youapp:doverifycode' %}" method="post"> {% csrf_token %} <span>验证码</span><input type="text" name='verifycode' placeholder="请输入验证码"> {# 验证码的图传进来 1 是传入的参数，默认值#} <img id="verify_img" src="{% url 'youapp:getVerifyCode' 1 %}"> <br> <div id='ww'>更换验证码</div> <input type="submit" value="提交"> </form> </body> </html>

配置路径

from django.conf.urls import url
from youapp import views
urlpatterns = [
    url(r'^getverifycode/(\d+)', views.getVerifyCode, name='getVerifyCode'),
    url(r'^verifycode', views.verifycode, name='verifycode'),
    url(r'^doverifycode', views.doverifycode, name='doverifycode'),
    url(r'^rtfblog', views.rtfblog, name='rtfblog'),
]