Java access to SFTP with a private key

SftpWithPrivateKey.java

import java.util.Vector;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.ChannelSftp.LsEntry;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpATTRS;
import com.jcraft.jsch.SftpException;

public class TestSftpWithPrivateKey {

    static final String PRIVATE_KEY_FILE = "C:\\temp\\id_rsa.txt";
    static final String SFTP_USER = "alma_01abcde_inst@customers.na";
    static final String SFTP_HOST = "custdata-dc04.hosted.exlibrisgroup.com";
    static final int SFTP_PORT = 10022;
    static final String SFTP_DIR = "sandbox/subdir";
    static final int DEL_FILES_OLDER_THAN_IN_DAYS = 20;

    public static void main(String[] args) {
        JSch jSch = new JSch();
        Session session = null;
        Channel channel = null;
        ChannelSftp channelSftp = null;
        try {
            jSch.addIdentity(PRIVATE_KEY_FILE);
            System.out.println("Private Key Added.");
            session = jSch.getSession(SFTP_USER, SFTP_HOST, SFTP_PORT);
            System.out.println("Session created.");

            java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            session.connect();
            channel = session.openChannel("sftp");
            channel.connect();
            System.out.println("Shell channel connected.");
            channelSftp = (ChannelSftp) channel;

            channelSftp.cd(SFTP_DIR);
            System.out.println("Changed the directory to " + SFTP_DIR);

            int unixTimeNow = (int) (System.currentTimeMillis() / 1000);

            Vector<LsEntry> filesInDir = channelSftp.ls(".");
            for (LsEntry sftpFile : filesInDir) {
                String fileName = sftpFile.getFilename();
                if (fileName.startsWith("."))
                    continue;
                SftpATTRS attrs = sftpFile.getAttrs();
                int mTime = attrs.getMTime();
                int modifiedSecAgo = unixTimeNow - mTime;
                int modifiedDaysAgo = (modifiedSecAgo) / 60 / 60 / 24;
                System.out.println(sftpFile + " is " + modifiedDaysAgo + " days old");
                if (modifiedDaysAgo > DEL_FILES_OLDER_THAN_IN_DAYS) {
                    System.out.println("Deleting " + fileName);
                    channelSftp.rm(fileName);
                }
            }
        } catch (JSchException e) {
            e.printStackTrace();
        } catch (SftpException e) {
            e.printStackTrace();
        } finally {
            if (channelSftp != null) {
                channelSftp.disconnect();
                channelSftp.exit();
            }
            if (channel != null)
                channel.disconnect();

            if (session != null)
                session.disconnect();
        }
    }
}