问题
I want to make a relatively basic tool to browse a bucket in S3 as a file hierarchy rather than simply a list of filenames with slashes in them.
Currently, I am using boto to get the list of keynames in a bucket and then parsing the keynames to make a nested dictionary of the "folders" and files. However, that process takes so long! Even just going through each key to get a list of all higher level folders takes 15+ minutes.
How do tools such as cyberduck give a list of folders so quickly?
回答1:
Check this link: http://docs.aws.amazon.com/AmazonS3/latest/dev/ListingKeysHierarchy.html
listObjects() has a parameter called delimiter, which could be set to / and resulting list of objects will look exactly as a tree of files. I think this is what you're looking for.
来源：https://stackoverflow.com/questions/17095192/faster-way-to-make-s3-folder-hierarchy-than-parsing-of-filenames