Java SFTP Transfer Library [closed]

Question

I'm looking for a dead simple Java Library to use for SFTP file transfers. I don't need any other features beyond that.

I've tried Zehon's, but it's incredible naggy, and I think 8 jar files is a bit crazy for so little functionality as I require.

And the library have to be free (as in free beer), and preferable Open Source (not a requirement).

Thanks.

Answer 1

Edit : I'm going to keep my previous answer, as JSch is still used in many places, but if you need a better-documented library, you can use sshj. An example in how to use it to do sftp is :

SSHClient ssh = new SSHClient();
ssh.loadKnownHosts();
ssh.connect("host");
try {
    ssh.authPassword("username", "password");
    SFTPClient sftp = ssh.newSFTPClient();
    try {
        sftp.put(new FileSystemFile("/path/of/local/file"), "/path/of/ftp/file");
    } finally {
        sftp.close();
    }
} finally {
    ssh.disconnect();
}

---

Using JSch (a java ssh lib, used by Ant for example), you could do something like that :

Session session = null;
Channel channel = null;
try {
    JSch ssh = new JSch();
    ssh.setKnownHosts("/path/of/known_hosts/file");
    session = ssh.getSession("username", "host", 22);
    session.setPassword("password");
    session.connect();
    channel = session.openChannel("sftp");
    channel.connect();
    ChannelSftp sftp = (ChannelSftp) channel;
    sftp.put("/path/of/local/file", "/path/of/ftp/file");
} catch (JSchException e) {
    e.printStackTrace();
} catch (SftpException e) {
    e.printStackTrace();
} finally {
    if (channel != null) {
        channel.disconnect();
    }
    if (session != null) {
        session.disconnect();
    }
}

Here is another link using JSch to do SFTP.

You can use JSch directly this way, or through Commons VFS, but then you'll have to have both commons vfs jar and jsch jar.

Answer 2

How about FTPSClient from Apache Commons?

Answer 3

Here is the complete source code of an example using JSch without having to worry about the ssh key checking.

import com.jcraft.jsch.*;

public class TestJSch {
    public static void main(String args[]) {
        JSch jsch = new JSch();
        Session session = null;
        try {
            session = jsch.getSession("username", "127.0.0.1", 22);
            session.setConfig("StrictHostKeyChecking", "no");
            session.setPassword("password");
            session.connect();

            Channel channel = session.openChannel("sftp");
            channel.connect();
            ChannelSftp sftpChannel = (ChannelSftp) channel;
            sftpChannel.get("remotefile.txt", "localfile.txt");
            sftpChannel.exit();
            session.disconnect();
        } catch (JSchException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (SftpException e) {
            e.printStackTrace();
        }
    }
}

Answer 4

The exit() and the disconnect() must be placed in a finally block. In this example we've got a never ending program in case of an exception because a second thread won't terminate.