How Can I Retrieve Files via SFTP in Java Using JSch?

Retrieving Files via SFTP in Java

When utilizing SFTP rather than FTPS to retrieve files from a remote server, Java developers face a unique challenge. One approach is to explore the JSch library, a widely adopted choice for reputable open-source projects like Eclipse, Ant, and Apache Commons HttpClient.

JSch seamlessly accommodates both username/password and certificate-based logins, offering a comprehensive range of SSH2 capabilities. Below, we present a rudimentary example of retrieving a file over SFTP using JSch:

JSch jsch = new JSch();

String knownHostsFilename = "/home/username/.ssh/known_hosts";
jsch.setKnownHosts( knownHostsFilename );

Session session = jsch.getSession( "remote-username", "remote-host" );    
{
  // "interactive" version
  // can selectively update specified known_hosts file 
  // need to implement UserInfo interface
  // MyUserInfo is a swing implementation provided in 
  //  examples/Sftp.java in the JSch dist
  UserInfo ui = new MyUserInfo();
  session.setUserInfo(ui);

  // OR non-interactive version. Relies in host key being in known-hosts file
  session.setPassword( "remote-password" );
}

session.connect();

Channel channel = session.openChannel( "sftp" );
channel.connect();

ChannelSftp sftpChannel = (ChannelSftp) channel;

sftpChannel.get("remote-file", "local-file" );
// OR
InputStream in = sftpChannel.get( "remote-file" );
  // process inputstream as needed

sftpChannel.exit();
session.disconnect();

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