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URL: https://www.progressiverobot.com/jsch-example-java-ssh-unix-server/

Today we will look into the JSch example tutorial. We can use JSch for creating an SSH connection in java. Earlier I wrote a program to connect to [remote database on SSH server](/community/tutorials/java-mysql-ssh-jsch-jdbc). Today, I am presenting a program that can be used to connect to the SSH-enabled server and execute shell commands. I am using JSch to connect to remote ssh server from java program.

JSch Example

jsch example illustration for: JSch Example

You can download JSch jar from its official website. You can also get the JSch jars using below maven dependency.

				
					<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.53</version>
</dependency>

Below is a simple JSch example program to run the "ls -ltr" command on the server.

				
					import java.io.InputStream;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;


public class JSchExampleSSHConnection {

	/**
	 * JSch Example Tutorial
	 * Java SSH Connection Program
	 */
	public static void main(String[] args) {
	    String host="ssh.journaldev.com";
	    String user="sshuser";
	    String password="sshpwd";
	    String command1="ls -ltr";
	    try{
	    	
	    	java.util.Properties config = new java.util.Properties(); 
	    	config.put("StrictHostKeyChecking", "no");
	    	JSch jsch = new JSch();
	    	Session session=jsch.getSession(user, host, 22);
	    	session.setPassword(password);
	    	session.setConfig(config);
	    	session.connect();
	    	System.out.println("Connected");
	    	
	    	Channel channel=session.openChannel("exec");
	        ((ChannelExec)channel).setCommand(command1);
	        channel.setInputStream(null);
	        ((ChannelExec)channel).setErrStream(System.err);
	        
	        InputStream in=channel.getInputStream();
	        channel.connect();
	        byte[] tmp=new byte[1024];
	        while(true){
	          while(in.available()>0){
	            int i=in.read(tmp, 0, 1024);
	            if(i<0)break;
	            System.out.print(new String(tmp, 0, i));
	          }
	          if(channel.isClosed()){
	            System.out.println("exit-status: "+channel.getExitStatus());
	            break;
	          }
	          try{Thread.sleep(1000);}catch(Exception ee){}
	        }
	        channel.disconnect();
	        session.disconnect();
	        System.out.println("DONE");
	    }catch(Exception e){
	    	e.printStackTrace();
	    }

	}

}

Let me know if you face any problem with the execution of the JSch example program. It's a pretty straight forward example of JSch to create an SSH connection in java program. You can download JSch jar file from its official website.