python-图片流传输的思路及示例(url转换二维码)
(编辑：jimmy 日期: 2024/11/16 浏览：3 次 )
1.场景
- 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="/UploadFiles/2021-04-08/data:;base64,{{ img_stream }}">
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