python-图片流传输的思路及示例(url转换二维码)

Python itxz 1个月前 (12-22) 27次浏览 0个评论

将URL动态生成二维码前端展示(微信支付等,)–》
1.静态文件路径访问
返回URL_name,(a标签,src 静态路由访问)

2.流传输,前端渲染
二进制流返回前端,前端根据二进制流编码类型显示

3.前端js生成
后台获取到微信支付的code_url,前端js将code_url生成二维码,并渲染

实际代码
使用python_web 框架–》tornado
manager.py

import os
import asyncio
 
import tornado.ioloop
import tornado.httpserver
import tornado.web
import tornado.options
 
from tornado.options import define, options, parse_command_line
from apps import UrlHandler, Url2Handler, Url3Handler
 
 
define("port", default=8000, type=int)
 
 
def create_app():
  settings = {
    "template_path": os.path.join(os.path.dirname(__file__), "templates"),
    "static_path": os.path.join(os.path.dirname(__file__), "static"),
  }
  application = tornado.web.Application(
    handlers=[
      (r"/url", UrlHandler),
      (r"/url2", Url2Handler),
      (r"/url3", Url3Handler),
    ],
    debug=True,
    **settings,
  )
  return application
 
 
if __name__ == '__main__':
  parse_command_line()
  app = create_app()
  server = tornado.httpserver.HTTPServer(app)
  server.listen(options.port)
  asyncio.get_event_loop().run_forever()

apps.py

import tornado.web
from manager_handler import gen_qrcode, gen_qrcode_obj,gen_qrcode_buf
 
 
class BaseHandler(tornado.web.RequestHandler):
  pass
 
 
class UrlHandler(BaseHandler):
  def get(self):
    # 获取链接
    self.render('qrcode.html', title='url', data='URL-提交', img_stream='')
 
  async def post(self):
    # 生成二维码
    url = self.get_argument('url_str')
 
    # URL转换二维码
    img_stream = gen_qrcode(url)
    await self.render('qrcode.html', title='qrcode', data='扫码支付', img_stream=img_stream)
 
 
class Url2Handler(BaseHandler):
  def get(self):
    # 获取链接
    self.render('qrcode.html', title='url', data='URL-提交', img_stream='')
 
  async def post(self):
    # 生成二维码
    url = self.get_argument('url_str')
 
    # URL转换二维码
    img_stream = gen_qrcode_obj(url=url)
    # await self.render('qrcode.html', title='qrcode', data='扫码支付', img_stream=img_stream)
    self.set_header('Content_Type', 'image/jpg')
    self.set_header('Content_length', len(img_stream))
    self.write(img_stream)
 
 
class Url3Handler(BaseHandelr):
  def get(self):
    self.render('qrcode.html', title='url', data='URL-提交', img_stream='')
 
  def post(self):
    url = self.get_argument('url')
    img_stream = gen_qrcode_buf(url)
    self.set_header('Content-Type', 'image/png')
    self.write(img_stream)

manager_handler.py

import qrcode
import io
import base64
import time
 
 
def gen_qrcode(url):
  """
  方式1: URL转换二维码
  :param url: 转换二维码的URL
  :return: base64编码后的 二进制流 二维码数据
  """
  qr = qrcode.make(url)
  buf = io.BytesIO()
  qr.save(buf)
  img_buf = buf.getvalue()
  img_stream = base64.b64encode(img_buf)
  return img_stream
 
 
def gen_qrcode_obj(version=1, box_size=10, border=4, url=None):
  """
  方式2: URL转换二维码(图片流传输, template需要指明 data:base64编码)
  :param version:
  :param box_size:
  :param border:
  :return:
  """
  qr = qrcode.QRCode(
    version=version,
    error_correction=qrcode.constants.ERROR_CORRECT_L,
    box_size=box_size,
    border=border,
  )
 
  url = "https://www.12dms.com" if url is None else url
  save_name = "./" + "qrcode" + str(time.time()) + ".png"
 
  qr.add_data(url)
  qr.make()
  img = qr.make_image()
  img.save(save_name.encode())
  with open(save_name, 'rb') as img_f:
    img_stream = img_f.read()
    img_stream = base64.b64encode(img_stream)
    print(img_stream)
  return img_stream
 
def gen_qrcode_buf(words):
  qr = qrcode.make(words)
  buf = io.BytesIO()
  qr.save(buf, 'png')
  qr_buf = buf.getvalue()
  # img_stream = base64.b64encode(qr_buf)
  return qr_buf

base.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>{% block title %}{% end %}</title>
  {% block head %}{% end %}
</head>
 
<body>
  <h1 style="text-align: center">
    {% block h1 %}{{ data }}{% end %}
  </h1>
  {% block content %}{% end %}
</body>
</html>

qrcode.html

{% extends "base.html" %}
 
{% block title %}
  {{ title }}
{% end %}
 
{% block h1 %}
  {{ data }}
{% end %}
 
 
{% block content %}
  <form method="post" action="" >
    <p>
      输入待转换的URL:<input name="url_str"/>
      <br>
{#      {{ img_stream }}#}
      {% if img_stream %}
        <img style="width:180px" src="data:;base64,{{ img_stream }}" alt="">
      {% end %}
    </p>
    <br>
    <input id="submit" type="submit" value="生成二维码">
  </form>
{% end %}

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