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python-图片流传输的思路及示例(url转换二维码)

作者：yblackd　　发布时间：2021-06-18 14:48:44　

标签：python,图片流,传输,url,二维码

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="data:;base64,{{ img_stream }}" alt="">
{％ end ％}
</p>
<br>
<input id="submit" type="submit" value="生成二维码">
</form>
{％ end ％}

来源：https://www.cnblogs.com/yblackd/p/13224404.html

投稿

python-图片流传输的思路及示例(url转换二维码)

1.场景

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