问题描述
我想压缩一个字符串(可能很大)并通过FTP发送.到目前为止，我使用的是ftplib和ziplib，但是它们相处得不太好.
I want to zip a string(could be very big) and send it through FTP.So far I am using ftplib and ziplib, but they are not getting along too well.
ftp = FTP(self.host)
ftp.login(user=self.username, passwd=self.password)
ftp.cwd(self.remote_path)
buf = io.BytesIO(str.encode("This string could be huge!!"))
zip = ZipFile.ZipFile(buf, mode='x')
# Either one of the two lines
ftp.storbinary("STOR " + self.filename, buf) # Works perfectly!
ftp.storbinary("STOR " + self.filename, zip) # Doesnt Work
ftp.quit()
行不起作用会引发以下错误.
The line that doesn't work throws me the following error.
我尝试将文件压缩到bytesio，但未成功.
I tried to zip the file to bytesio without success.
我需要在内存中完成所有这些操作.我无法先将zip文件写入服务器，然后再写入ftp.
I need to do this all in memory. I cant write the zip file on the server first and then ftp.
此外，我需要通过纯FTP，而不是SFTP或SSH来完成此操作.
Also, I need to do it through pure FTP, no SFTP nor SSH.
推荐答案
我认为您正以错误的方式解决问题.
I think you're taking the problem the wrong way round.
ftp.storbinary需要一个bytes对象，而不是一个ZipFile对象.您需要使用未压缩数据中的压缩数据创建bytes对象，并将其传递给ftp.storbinary.另外，您还必须为存档中的文件提供一个名称.
ftp.storbinary needs a bytes object, not a ZipFile object. You need to create bytes object with compressed data out of your uncompressed data, and pass that to ftp.storbinary. Plus you have to provide a name for the file in the archive.
此代码段通过字符串创建这样的对象(独立示例)
this snippet creates such an object from a string (standalone example)
import zipfile,io
output_io = io.BytesIO()
zipfile_ob = zipfile.ZipFile(output_io,"w",zipfile.ZIP_DEFLATED)
zipfile_ob.writestr("your_data.txt",b"big string to be compressed"*20)
zipfile_ob.close()
现在已适应您的情况:
ftp = FTP(self.host)
ftp.login(user=self.username, passwd=self.password)
ftp.cwd(self.remote_path)
buf = str.encode("This string could be huge!!")
output_io = io.BytesIO()
zipfile_ob = zipfile.ZipFile(output_io,"w",zipfile.ZIP_DEFLATED)
zipfile_ob.writestr("your_data.txt",buf)
zipfile_ob.close()
output_io.seek(0) # rewind the fake file
ftp.storbinary("STOR " + self.filename, output_io)
ftp.quit()
需要seek部分，否则您将在文件末尾传递类似output_io的文件对象(您刚刚写入它，因此当前位置是:流的末尾).使用seek(0)可以倒回文件状对象，以便可以从头开始读取.
The seek part is needed else you're passing the output_io file-like object while at the end of the file (you just wrote to it so current position is: end of stream). Using seek(0) rewinds the file-like object so it can be read from the start.
请注意，对于一个文件，最好使用Gzip对象.
note that for only one file, it may be better to use a Gzip object.
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