connect to SFTP using java

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");
        sftp开发者_运维技巧Channel.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?

---

You can try increasing the timeout on Jsch Framework.

session.connect(int Timeout)

session.connect(30000);

More on Jcsh javadoc

---

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.

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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.

---

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();

---

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.

---

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);