# 生成驗證碼
from PIL import Image,ImageDraw,ImageFont from io import BytesIO
from .myutil import get_random_color
def get_confirm_code(req):
# 實例化畫布 img_size = (150,70) #畫布大小 img_color = get_random_color() #畫布顏色 img = Image.new('RGB',img_size,img_color) #新建畫布傳入畫布模式,大小,顏色 # 實例化畫筆 draw = ImageDraw.Draw(img) #確認畫筆在哪塊畫布上畫# 實例化一個字體 font_path = os.path.join(settings.STATICFILES_DIRS[0],'fonts/ADOBEARABIC-BOLD.OTF') #確認字體路徑 font_size = 30 #確認字體大小 font = ImageFont.truetype(font_path,font_size) #將字體傳入到畫布上
# 在畫布上生成四個隨機字母 source = 'qwertyuiopasdfghjklzxcvbnm1234567890QWERTYUIOPASDFGHJKLZXCVBNM' res = '' for i in range(4): code_color = get_random_color() index = random.randint(0,len(source)) my_str = source[index] res += my_str draw.text((20+30*i,20),my_str,fill=code_color,font=font) # 將字母畫在畫布上
# 在畫布上隨機生成200個顏色位置不肯定的點 for i in range(200): x = random.randint(0,149) y = random.randint(0,69) draw.point((x,y),fill=get_random_color())
# 將生成的畫布以二進制數據保存到內存中,並指定格式 buf = BytesIO() img.save(buf,'png') del draw #刪除保存後的畫布 # 保存到session,爲了下一步能夠取出做比較 req.session['verify_code'] = res return HttpResponse(buf.getvalue(),content_type='image/png') #以圖片形式返回保存在內存中的值
get_confirm_code用到的工具類函數以下:
import randomdef get_random_color(): r = random.randint(0,256) g = random.randint(0,256) b = random.randint(0,256) return (r,g,b)
包含驗證碼的驗證頁面html
def login(req): if req.method == 'GET': return render(req,'login.html') else: code = req.POST.get('code') server_code = req.session.get('verify_code') if code and len(code)>0 and code.lower() == server_code.lower(): return HttpResponse('ok') else: return HttpResponse('no ok')
前端頁面前端
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script> <script> $(function () { $('#myimg').click(function () { $(this).attr('src',"/app/get_confirm_code/"+Math.random()) }) }) </script> </head> <body> <form action="/app/login/" method="post"> <img src="/app/get_confirm_code/" alt="" id="myimg"><br> <input type="text" name="code" placeholder="請輸入驗證碼"><br> <input type="submit" value="驗證"> </form> </body> </html>