使用了aiohttp, aiofiles库，异步操作
服务端代码如下，启动服务后，默认监听0.0.0.0:8080
没有做任何异常处理，适用于小文件，仅供参考
file_server.py:
import aiofilesimport asyncioimport osfrom aiohttp.web import Responsefrom aiohttp import webdef query_parse(req): ???obj = req.query_string ???queryitem = [] ???if obj: ???????query = req.query.items() ???????for item in query: ???????????queryitem.append(item) ???????return dict(queryitem) ???else: ???????return Noneasync def download(request): ???query = query_parse(request) ???filename = query.get(‘file‘) ???????# 没有作任何异常处理，只有服务器上存在/tmp/files目录，并且请求的文件在该目录下，才能正常下载 ???file_dir = ‘/tmp/files‘ ???file_path = os.path.join(file_dir, filename) ???if os.path.exists(file_path): ???????async with aiofiles.open(file_path, ‘rb‘) as f: ???????????content = await f.read() ???????if content: ???????????response = Response( ???????????????content_type=‘application/octet-stream‘, ???????????????headers={‘Content-Disposition‘: ‘attachment;filename={}‘.format(filename)}, ???????????????body=content ???????????????????????????) ???????????return response ???????else: ???????????return ???else: ???????returnloop = asyncio.get_event_loop()app = web.Application(loop=loop)app.router.add_route(method=‘get‘, path=‘/download‘, handler=download)web.run_app(app)loop.close()python3 file_server.py 运行服务端
客户端代码如下：
download.py:
import aiohttpimport asyncioimport aiofiles# 访问服务端download接口函数，下载服务器上指定目录（/tmp/files/）下的文件l5u.jpgurl = ‘http://localhost:8080/download‘params = {‘file‘: ‘l5u.jpg‘}async def download(): ???async with aiohttp.ClientSession() as session: ???????async with session.get(url, params=params) as resp: ???????????content = await resp.content.read() ???????async with aiofiles.open(‘/tmp/test.jpg‘, ‘wb‘) as f: ???????????await f.write(content)loop = asyncio.get_event_loop()loop.run_until_complete(download())执行python3 download.py，查看/tmp/test.jpg是否存在，打开是否正常
或者直接使用浏览器访问http://localhost:8080/download?file=l5u.jpg， 下载下来的文件名称与请求发送的文件名称（服务器上存在的文件名称）一致
aiohttp web方式提供文件下载服务
原文地址：http://blog.51cto.com/xiebingtang/2333025