SSH connection with Java

Question

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?

Answer 1

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