What Java SSH Libraries Exist, and How Can I Use JSCH for Secure Remote Connections?

SSH Libraries for Java

When connecting to remote servers using SSH, it's crucial to utilize a reliable library. In Java, one notable option is the Java Secure Channel (JSCH).

JSCH for SSH in Java

JSCH is a widely adopted open-source library that facilitates seamless SSH connections in Java applications. Its BSD-style license allows for both personal and commercial use.

Example Usage of JSCH for SSH Connections

import com.jcraft.jsch.*;

public class SSHConnection {

    public static void main(String[] args) throws JSchException {
        // Replace user, host, and port with your own server details
        String user = "username";
        String host = "server.example.com";
        int port = 22;

        JSch jsch = new JSch();
        Session session = jsch.getSession(user, host, port);
        session.connect();

        Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand("ls -la");
        channel.connect();

        InputStream in = channel.getInputStream();
        byte[] result = new byte[1024];
        while (true) {
            while (in.available() > 0) {
                int i = in.read(result, 0, 1024);
                if (i < 0) {
                    break;
                }
                System.out.print(new String(result, 0, i));
            }
            if (channel.isClosed()) {
                System.out.println("Exit status: " + channel.getExitStatus());
                break;
            }
        }

        channel.disconnect();
        session.disconnect();
    }
}

This code sample demonstrates how to establish an SSH connection to a remote server, execute a command, and display the output using JSCH.

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