Django中使用pillow实现登录验证码功能(带刷新验证码功能)

首先在项目里建立common目录,编写验证码的函数

verification_code.py

import random

from PIL import Image, ImageFont, ImageDraw

def get_code():
    mode = 'RGB'
    bg_width = 180 #这个是验证码那个框框的宽度
    bg_height = 30 #这个是验证码那个框框的高度
    bg_size = (bg_width, bg_height)
    bg_color = (255, 255, 255)
    ttf_path = 'config/DejaVuSansMono.ttf'#这个是字体，从linux里扒出来饿字体
    # ttf_path = '/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf' #这个要换你服务器里有的字体才行
    img = Image.new(mode, bg_size, bg_color)
    draw = ImageDraw.Draw(img, mode)
    font = ImageFont.truetype(ttf_path, 20)#这个俺也没懂

    # generate text
    letters = get_letters()
    for index, text in enumerate(letters):
        x = 35 * index + 10 #这个好像是调那个字符间距的
        y = 0
        draw.text((x, y), text, get_rdmcolor(), font)

    # blur the background
    for i in range(100): #这个是设置干扰线的,数值越大,干扰的越厉害
        x = random.randint(0, bg_width)
        y = random.randint(0, bg_height)
        fill = get_rdmcolor()
        draw.point((x, y), fill)
    return img, letters

def get_letters(): #这个就是从下面这些字母里去随机4个出来
    base = '1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM'
    result = []
    for i in range(4): #这个是4位,应该改更多位,那么上面的参数还要调试,不然显示有问题
        result.append(random.choice(base))
    return result

def get_rdmcolor():
    return random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)

模板

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="POST" action="login/">
    <p>用户名：<input type="text" name="user"></p>
    <p>密码：<input type="text" name="pwd"></p>
    <label for="verification_code">验证码:</label><input type="text" id="verification_code" name="verification_code"
                                                      placeholder="Please type below code">
    <img class="identifyCode" title="点击重新获取" onclick="this.setAttribute('src','verification_code?random='+Math.random())" src="{% url 'verification_code' %}" alt="verification code">
    <br>
    <input type="submit" value="登录">
</form>
<script>
</script>
</body>
</html>

onclick="this.setAttribute('src','verification_code?random='+Math.random())"

这个 onclick事件 就是实现点击图片刷新验证码功能 ,那为啥要加个随机数呢，这样就不会走浏览器缓存了

urls.py

from django.urls import path

from test_login_app import views

urlpatterns = [
    path('',views.index),
    path('verification_code/', views.verification_code, name='verification_code'),
    path('login/',views.login),
    path('index/',views.index2),
]

views.py

from io import BytesIO

from django.http import HttpResponse
from django.shortcuts import render, redirect

from common.verification_code import get_code

# Create your views here.

def index(request):
    return render(request, 'login.html')

def verification_code(request):
    img, letters = get_code()
    request.session['verification_code'] = ''.join(letters)
    fp = BytesIO()
    img.save(fp, 'png')
    return HttpResponse(fp.getvalue(), content_type='image/png')

def login(request):#我这个没跟数据库联动,简单模拟的逻辑
    if request.method == 'POST':
        name = request.POST.get('user')
        password = request.POST.get('pwd')
        code = request.POST.get('verification_code')
        if name == 'fuck' and password == 'xxoo' and code == request.session.get('verification_code', ''):
            return redirect('/index/')
    return render(request,'login.html')

def index2(request):
    return render(request,'index.html')

成品如图

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