CODEWITHSUNDEEP
javasshconnection
user348041
user348041

Reputation: 371

SSH connection with Java

How can I connect to an SSH server in Java? I don't need/want a shell. I just want to connect to the SSH server and get the content of, say, file.txt. How can I do that?

Upvotes: 37

Views: 111987

Answers (8)

Zyad
Zyad

Reputation: 5

I used this and worked for me

ChannelExec channel=(ChannelExec)session.openChannel("exec");
String command = "Your Command here";
channel.setCommand(command);

InputStream in=channel.getInputStream();
channel.setErrStream(System.err);
channel.connect();

Upvotes: -3

Taurean Wooley
Taurean Wooley

Reputation: 51

Not 100% sure but I believe that the sockets have a great deal to do with ssh connections unless you are attempting to do a pre-installed command manipulation application. There are numerous outside packages that you can use to achieve this goal, but if you want to do your own socket creation, it's going to take a large amount of reading and deciphering/encrypting to get this done.

Also creating your own socket is dangerous if not done correctly with the right protocols and security specifications, so be wary about doing so until you are 100% sure you're capable of committing to learning enough.

Upvotes: 0

World
World

Reputation: 2057

Use JSch

import com.jcraft.jsch.*;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;

/**
 * @author World
 */
public class SSHReadFile {

    public static void main(String args[]) {
        String user = "john";
        String password = "mypassword";
        String host = "192.168.100.23";
        int port = 22;
        String remoteFile = "/home/john/test.txt";

        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(user, host, port);
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            System.out.println("Establishing Connection...");
            session.connect();
            System.out.println("Connection established.");
            System.out.println("Crating SFTP Channel.");
            ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
            sftpChannel.connect();
            System.out.println("SFTP Channel created.");

            InputStream inputStream = sftpChannel.get(remoteFile);

            try (Scanner scanner = new Scanner(new InputStreamReader(inputStream))) {
                while (scanner.hasNextLine()) {
                    String line = scanner.nextLine();
                    System.out.println(line);
                }
            }
        } catch (JSchException | SftpException e) {
            e.printStackTrace();
        }
    }
}

output:

Establishing Connection...
Connection established.
Crating SFTP Channel.
SFTP Channel created.
This is content from file /home/john/test.txt

Upvotes: 51

Fortega
Fortega

Reputation: 19702

You could check JSSH, which is a Java SSH library.

Upvotes: 1

Thorbjørn Ravn Andersen
Thorbjørn Ravn Andersen

Reputation: 75426

http://www.ganymed.ethz.ch/ssh2/ implements a ssh2 client in Java. I use it for port forwarding.

Upvotes: 1

Petar Minchev
Petar Minchev

Reputation: 47403

You must use a third-party library - JSch is one of them. Google with "Java ssh" and you will get plenty of other options.

Upvotes: 1

Brian Clapper
Brian Clapper

Reputation: 26230

Take a look at Jaramiko.

Upvotes: 0

Michael Mrozek
Michael Mrozek

Reputation: 175705

Java doesn't support that natively, but you can use a library like JSch to do it

Upvotes: 5

Related Questions