How to upload the file to another SFTP server from shell channel by using Jsch?

Question

Step 1: Session connect

....
session.connect()

Step 2: Shell channel

channel = session.openChannel("shell");

Step 3: Execute ssh commands to login Unix server and go to the required path cd /logs/server

PrintStream shellStream = new PrintStream(channel.getOutputStream());  // printStream for convenience 
channel.connect(); 
shellStream.println(command); 
shellStream.flush();

step 4: Get the file from Unix server and put into SFTP:

code to connect sftp channel and put the file from unix server to sftp.

So I want to upload the file (logs/server/server.log) from Unix server (which I logged in using shell channel) to SFTP server.

Both source and destination are remote.

Is it possible to do by using JSch?

Martin Prikryl Martin Prikryl · Accepted Answer · 2015-01-27T07:45:26

An SFTP protocol (let only JSch SFTP library) has no support for transfers between two remote servers.

If you have a shell access to one of the servers, you can try to transfer the files by using a command-line (OpenSSH) sftp client on the server. It's doable. Problematic is an authentication part, as it's non-interactive session. You would have to use an unencrypted private key, an agent forwarding or sshpass.

Obvious and simple implementation is to download the files from the "Unix" server to a local machine and then upload them to the "SFTP" server. But you need to use the SFTP channel, not the shell channel, for the download.

How to upload the file to another SFTP server from shell channel by using Jsch?

1 Answers