python3.6 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 aiofiles
import asyncio
import os
from aiohttp.web import Response
from aiohttp import web
def 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 None
async 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:
return
loop = 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 aiohttp
import asyncio
import 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.jpg
url = '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
