(Java) Co:Z SFTP Binary File Download (from z/OS IBM Mainframe)

Demonstrates how to download a binary file, such as a .zip, from a Co:Z SFTP server on a z/OS IBM Mainframe.

Note: This requires Chilkat v9.5.0.76 or greater.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSFtp sftp = new CkSFtp();

    // Connect to the SSH server.  
    String hostname = "sftp.example.com";
    int port = 22;
    boolean success = sftp.Connect(hostname,port);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    success = sftp.InitializeSftp();
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    // To download a binary file from the Co:Z SFTP server, 
    // we must switch to binary mode in the following unconventional way.
    // We pretend to fetch a directory listing for "/+mode=binary"
    // This has the effect of putting the server in binary mode for transfers.
    String handle = sftp.openDir("/+mode=binary");
    if (sftp.get_LastMethodSuccess() != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    // Download the "directory listing" (but it's not actually a directory listing, and we'll just discard it.)
    CkSFtpDir dirListing = sftp.ReadDir(handle);
    if (sftp.get_LastMethodSuccess() != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    // Close the directory handle:
    success = sftp.CloseHandle(handle);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    // Download the binary file:
    String localFilePath = "c:/temp/test.zip";
    String remoteFilePath = "test.zip";
    success = sftp.DownloadFileByName(remoteFilePath,localFilePath);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    System.out.println("Success.");
  }
}