Checked vs. Runtime Exceptions in Java

Good article on Effective Java Exceptions – http://dev2dev.bea.com/pub/a/2006/11/effective-exceptions.html

Remote Unix commands from Java

This post shows a simple java class which allows you to run unix commands on a remote server. Java Secure Chanel (JSch) library is used to run the commands. JSch is used in Ant and Eclipse. The only third party library required is jsch-0.x.x.jar.

package com.demo.jsch;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UserInfo;

public class ShellExample {

  public static void main(String[] args) {

    String user = "username";
    String host = "servername";

    JSch jsch = new JSch();

    try {

      Session session = jsch.getSession(user, host, 22);

      UserInfo userInfo = new MyUserInfo();
      session.setUserInfo(userInfo);
      session.connect(30000);

      Channel channel = session.openChannel("shell");
      channel.setInputStream(System.in);
      channel.setOutputStream(System.out);
      channel.connect(3 * 1000);

    } catch (JSchException e) {
      e.printStackTrace();
    }

}

  public static class MyUserInfo implements UserInfo {

    public String getPassword() {
      return "password";
    }

    public String getPassphrase() {
      return "";
    }

    public boolean promptPassword(String arg0) {
      return true;
    }

    public boolean promptPassphrase(String arg0) {
      return true;
    }

    public boolean promptYesNo(String arg0) {
      return true;
    }

    public void showMessage(String arg0) {
    }

  }

}