Reliable example of how to use SFTP using public private key authentication with Java

Question

Recently a client of our unexpectedly shifted some important files we collect from an ftp to sftp server. Initially I was under the impression that it would be simple to write

Answer 1

I guess this is what you are looking for -

/**
* @param args
*/
public static void main(String[] args) {

    /*Below we have declared and defined the SFTP HOST, PORT, USER
            and Local private key from where you will make connection */
    String SFTPHOST = "10.20.30.40";
    int    SFTPPORT = 22;
    String SFTPUSER = "kodehelp";
    // this file can be id_rsa or id_dsa based on which algorithm is used to create the key
    String privateKey = "/home/kodehelp/.ssh/id_rsa";
    String SFTPWORKINGDIR = "/home/kodehelp/";

    JSch jSch = new JSch();
    Session     session     = null;
    Channel     channel     = null;
    ChannelSftp channelSftp = null;
    try {
        jSch.addIdentity(privateKey);
        System.out.println("Private Key Added.");
        session = jSch.getSession(SFTPUSER,SFTPHOST,SFTPPORT);
        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(SFTPWORKINGDIR);
        System.out.println("Changed the directory...");
    } catch (JSchException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (SftpException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally{
        if(channelSftp!=null){
            channelSftp.disconnect();
            channelSftp.exit();
        }
        if(channel!=null) channel.disconnect();

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

See more at

http://kodehelp.com/sftp-connection-public-key-authentication-java/