How to copy a file in FTP server using FTPClient in Java?

Question

I have a CSV file, and I need to copy it and rename it in the same path.

I tried this after the FTP login:

InputStream inputStream = ftpClient.retrieveFileStream(cvs_name +".csv");
ftpClient.storeFile(cvs_name2 + ".csv",inputStream);

But when I verify the file on the server, it's empty. How can I copy a file and rename it?

This question has been answered [here](http://stackoverflow.com/questions/11202215/how-to-copy-a-file-on-the-ftp-server-to-a-directory-on-the-same-server-in-java) — Ohad Benita, Jun 06 '16 at 18:06
I already saw it, but in that case it's in different directory, I think if I use it in the same directory it will overwrite the original file, and that's not what I need — Pablo Glez, Jun 06 '16 at 18:19

score 2 · Accepted Answer · edited May 23 '17 at 10:34

2

I believe your code cannot work. You cannot download and upload a file over a single FTP connection at the same time.

You have two options:

Download the file completely first (to a temporary file or to a memory).

The accepted answer to How to copy a file on the ftp server to a directory on the same server in java? shows the "to memory" solution. Note the outputStream.toByteArray() call.

Open two connections (two instances of the FTPClient) and copy the file between the instances.

InputStream inputStream = ftpClient1.retrieveFileStream(cvs_name + ".csv");
ftpClient2.storeFile(cvs_name2 + ".csv", inputStream);

edited May 23 '17 at 10:34

Community

answered Jun 06 '16 at 20:19

Martin Prikryl

I still having an empty file on server – Pablo Glez Jun 07 '16 at 14:53
**** Only the first option worked, the second did not, if you edit your answer would be better I think so! – Pablo Glez Jun 07 '16 at 15:02

1 Answers1