使用生成数据csv.writer并传输响应。使用StringIO写入内存缓冲区，而不是生成中间文件。
import csv
from datetime import datetime
from io import StringIO
from flask import Flask
from werkzeug.wrappers import Response
app = Flask(__name__)
# example data, this Could come from wherever you are storing logs
log = [
('login', datetime(2015, 1, 10, 5, 30)),
('deposit', datetime(2015, 1, 10, 5, 35)),
('order', datetime(2015, 1, 10, 5, 50)),
('withdraw', datetime(2015, 1, 10, 6, 10)),
('logout', datetime(2015, 1, 10, 6, 15))
]
@app.route('/')
def download_log():
def generate():
data = StringIO()
w = csv.writer(data)
# write header
w.writerow(('action', 'timestamp'))
yield data.getvalue()
data.seek(0)
data.truncate(0)
# write each log item
for item in log:
w.writerow((
item[0],
item[1].isoformat() # format datetime as string
))
yield data.getvalue()
data.seek(0)
data.truncate(0)
# stream the response as the data is generated
response = Response(generate(), mimetype='text/csv')
# add a filename
response.headers.set("Content-Disposition", "attachment", filename="log.csv")
return response
如果该generate函数需要从current中获取信息request，则应使用修饰stream_with_context，否则您将收到“在外部请求上下文中工作”错误。其他所有内容保持不变。
from flask import stream_with context
@stream_with_context
def generate():
...
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