connect to SFTP using java

Question

I need help with connection to SFTP server? Does anybody have working code?

I found something like this

package test.JSch;

import com.jcraft.jsch.*;

public class TestJSch {
public static void main(String args[]) {
    JSch jsch = new JSch();
    Session session = null;
    try {
        session = jsch.getSession("USSERNAME", "HOST", 22);
        //session.setConfig("StrictHostKeyChecking", "no");
        session.setPassword("PASSWORD");
        System.out.println("1");
        session.connect();
        System.out.println("2");

        Channel channel = session.openChannel("sftp");
        System.out.println("3");
        channel.connect();
        System.out.println("4");
        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();
    }
    }
}

but this was the output

com.jcraft.jsch.JSchException: java.net.ConnectException: Connection timed out: connect
    at com.jcraft.jsch.Util.createSocket(Util.java:258)
    at com.jcraft.jsch.Session.connect(Session.java:186)
    at com.jcraft.jsch.Session.connect(Session.java:145)
    at test.JSch.TestJSch.main(TestJSch.java:17)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at com.jcraft.jsch.Util.createSocket(Util.java:252)
    ... 3 more

what is wrong with this code?

Can you be more specific when you say it doesn't work. What exception are you getting? Does it compile? What library are you using? — , Jun 09 '11 at 09:22

score 2 · Answer 1 · answered Dec 16 '13 at 17:13

2

You can try increasing the timeout on Jsch Framework.

session.connect(int Timeout)

session.connect(30000);

More on Jcsh javadoc

answered Dec 16 '13 at 17:13

Njax3SmmM2x2a0Zf7Hpd

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Timeout is in milliseconds or seconds ? – Maverick Jan 25 '16 at 13:27

score 1 · Answer 2 · edited May 23 '17 at 12:14

Here is an earlier question on Stackoverflow, for which the accepted answer suggests using JSch library.

How to retrieve a file from a server via SFTP?

I see that you have tried to connect via JSch and got an error.

I would suggest that the first thing is to check if you can connect to the sftp machine from the client (same machine on which you are testing your program), using a standard sftp client like Filezilla on Windows OR just the sftp command on a terminal in *nix systems.

score 0 · Answer 3 · answered Jun 29 '16 at 10:02

0

JSch API : session.connect(); asking again user name and password to connect to server even though those are passed as parameter.

how to make the code to avoid asking user name and password again.

answered Jun 29 '16 at 10:02

Ravish

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score 0 · Answer 4 · answered Jun 12 '18 at 23:44

I was having the same problem with a shell connection. The solution was to increase the timeout, in my case 5000 msec was enough

JSch jsch = new JSch();
Session session = jsch.getSession(USERNAME, HOSTNAME, SSH_PORT);
session.setPassword(PASSWORD);
Hashtable<String,String> config = new Hashtable<String,String>();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect(5000);

score 0 · Answer 5 · answered Jun 09 '11 at 09:22

0

I've had success using the JSch library. It has notoriously bad documentation, but is rumored to implement its SSH functionalities very strictly and efficiently.

answered Jun 09 '11 at 09:22

deltaforce2

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score 0 · Answer 6 · edited Aug 27 '14 at 13:27

0

You can use Apache commons VFS

FileSystemManager fsManager = VFS.getManager();
FileObject remoteFile = fsManager.resolveFile("sftp://myusername:mypassword@somehost/pub/downloads/somefile.tgz" );
InputStream in = remoteFile.getContent().getInputStream();

edited Aug 27 '14 at 13:27

Tony

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answered Jun 09 '11 at 11:55

KrzyH

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Wasn't VFS quite a large bundle of different types of file management tools which all depend on several other jars? If the OP needs just the SFTP part, VFS would be a bit of overkill. – deltaforce2 Jun 09 '11 at 12:37
it appears to obsolete – Njax3SmmM2x2a0Zf7Hpd Dec 16 '13 at 17:17
http://code.google.com/p/otrosvfsbrowser/ is using Apache Commons VFS ver.2 to browser remote file systems including SFTP. It works just fine. – KrzyH Dec 18 '13 at 11:40

connect to SFTP using java

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