django项目登录中使用图片验证码的实现方法

import randomdef get_random_color():    return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))def get_valid_code_img(request):  # 方式:  from PIL import Image, ImageDraw, ImageFont  from io import BytesIO  import random  img = Image.new("RGB", (270, 40), color=get_random_color())#生成一个宽270*高40的画布，背景颜色随机  draw = ImageDraw.Draw(img)#进行绘画  kumo_font = ImageFont.truetype("static/font/kumo.ttf", size=32)#字体 字体大小  valid_code_str = ""  for i in range(5):    random_num = str(random.randint(0, 9))#0-9的随机数 9    random_low_alpha = chr(random.randint(97, 122))#a 到 z 随机的一个小写字母 b    random_upper_alpha = chr(random.randint(65, 90))#A 到 Z 随机的一个大写字母 Q    random_char = random.choice([random_num, random_low_alpha, random_upper_alpha])    #2    draw.text((i * 50 + 20, 5), random_char, get_random_color(), font=kumo_font) #往长方形上写字    # 保存验证码字符串    valid_code_str += random_char #85656  width=270  height=40  for i in range(10):    # draw.point([random.randint(0, width), random.randint(0, height)], fill=get_random_color())#画小点    x = random.randint(0, width)    y = random.randint(0, height)    draw.arc((x, y, x + 4, y + 4), 0, 90, fill=get_random_color()) #小线段  request.session["valid_code_str"] = valid_code_str  f = BytesIO()  img.save(f, "png") #png  data = f.getvalue()  return data

# 登录path('login/', login.login,name='login'),# 图片验证码re_path('get_valid_code_img/', login.get_valid_code_img, name='get_valid_code_img'),

from blog.utils import validCode # 引入自定义的验证码#页面返回方法from django.shortcuts import render, HttpResponse, redirect#哈希加密from django.contrib.auth.hashers import make_password, check_password#数据库from blog.models import Article, Comment, Member, Praise, Web, Image# 登陆def login(request):  res = {'status': None, 'info': None}  if request.method == 'POST':    valid_code = request.POST.get("valid_code")    valid_code_str = request.session.get("valid_code_str")    print(valid_code, valid_code_str)    if valid_code.upper() == valid_code_str.upper():      # 查询用户和密码是否正确      username = request.POST.get('username')      pwd = request.POST.get('pwd')      username_obj = Member.objects.filter(member_name=username).first()      if not username_obj:        res['status'] = 3        res['info'] = '用户名不存在'        return HttpResponse(json.dumps(res))      if check_password(pwd, username_obj.member_pwd):        res['status'] = 1        res['info'] = '登录成功'        request.session['member_name'] = username        request.session['member_id'] = Member.objects.filter(member_name=username).first().member_id        response_new = HttpResponse(json.dumps(res)) # 把这个结果告诉给前台，ajax        return response_new      else:        res['status'] = 0        res['info'] = '帐号/密码错误'        return HttpResponse(json.dumps(res))    else:      res['status'] = 2      res['info'] = '验证码错误'      return HttpResponse(json.dumps(res))  return render(request, 'blog/login.html', locals())  # 生成图片验证码def get_valid_code_img(request):  img_data = validCode.get_valid_code_img(request)  return HttpResponse(img_data)

{#登陆的表单#}<form action="{% url 'blog:login' %}" method="post" id="login">  <input type="text" class="name" name="username" Placeholder="Username" required=""/>  <input type="password" class="password" name="pwd" Placeholder="Password" required=""/>  {% csrf_token %}  <input type="text" name="valid_code" placeholder="验证码">  <img width="270" height="36" id="valid_code_img" src="/blog/get_valid_code_img/" alt=""     onclick="this.src='/blog/get_valid_code_img/?'+Math.random()">  <div class="login-agileits-bottom">    <h6><a href="javascript:;" type="button" id="onsubmit">登陆</a></h6>  </div></form>{#登陆的表单结束#}

{# 登陆的jquery #}$(document).ready(function () {  $('#onsubmit').click(function () {    $.post('/blog/login/', $('#login').serialize(), function (data) {      if (data['status'] == 1) {        layer.msg(data.info);        location.href = "{% url 'index' %}";      } else {        layer.msg(data['info'])      }    }, 'json')  })}){# 登陆的jquery结束 #}