如何在python Flask框架中发送zip文件？
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How to send zip files in the python Flask framework?
提问by idungotnosn
I have a flask server that grabs binary data for several different files from a database and puts them into a python 'zipfile' object. I want to send the generated zip file with my code using flask's "send_file" method.
我有一个 Flask 服务器，它从数据库中获取几个不同文件的二进制数据，并将它们放入 python 'zipfile' 对象中。我想使用flask的“send_file”方法将生成的zip文件和我的代码一起发送。
I was originally able to send non-zip files successfully by using the BytesIO(bin) as the first argument to send_file, but for some reason I can't do the same thing with my generated zip file. It gives the error:
我最初能够通过使用 BytesIO(bin) 作为 send_file 的第一个参数来成功发送非 zip 文件，但由于某种原因，我无法对生成的 zip 文件执行相同的操作。它给出了错误：
'ZipFile' does not have the buffer interface.
'ZipFile' 没有缓冲区接口。
How do I send this zip file object to the user with Flask?
如何使用 Flask 将此 zip 文件对象发送给用户？
This is my code:
这是我的代码：
@app.route("/getcaps",methods=['GET','POST'])
def downloadFiles():
if request.method == 'POST':
mongo = MongoDAO('localhost',27017)
identifier = request.form['CapsuleName']
password = request.form['CapsulePassword']
result = mongo.getCapsuleByIdentifier(identifier,password)
zf = zipfile.ZipFile('capsule.zip','w')
files = result['files']
for individualFile in files:
data = zipfile.ZipInfo(individualFile['fileName'])
data.date_time = time.localtime(time.time())[:6]
data.compress_type = zipfile.ZIP_DEFLATED
zf.writestr(data,individualFile['fileData'])
return send_file(BytesIO(zf), attachment_filename='capsule.zip', as_attachment=True)
return render_template('download.html')
采纳答案by Martijn Pieters
BytesIO()needs to be passed bytes data, but a ZipFile()object is not bytes-data; you actually created a file on your harddisk.
BytesIO()需要传递字节数据，但ZipFile()对象不是字节数据；您实际上在硬盘上创建了一个文件。
You can create a ZipFile()in memory by using BytesIO()as the base:
您可以ZipFile()使用BytesIO()作为基础在内存中创建一个：
memory_file = BytesIO()
with zipfile.ZipFile(memory_file, 'w') as zf:
files = result['files']
for individualFile in files:
data = zipfile.ZipInfo(individualFile['fileName'])
data.date_time = time.localtime(time.time())[:6]
data.compress_type = zipfile.ZIP_DEFLATED
zf.writestr(data, individualFile['fileData'])
memory_file.seek(0)
return send_file(memory_file, attachment_filename='capsule.zip', as_attachment=True)
The withstatement ensures that the ZipFile()object is properly closed when you are done adding entries, causing it to write the required trailer to the in-memory file object. The memory_file.seek(0)call is needed to 'rewind' the read-write position of the file object back to the start.
该with语句可确保ZipFile()在您完成添加条目后正确关闭对象，从而使其将所需的预告片写入内存文件对象。该memory_file.seek(0)电话是需要“倒带”文件对象回到开始的读写位置。
