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(Java) SCP Download/Upload Binary Files as Encoded Strings

Demonstrates how to upload and download binary files as encoded strings (base64, hex, etc.) using the SCP protocol (Secure Copy Protocol over SSH).

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

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.

    CkSsh ssh = new CkSsh();

    // Hostname may be an IP address or hostname:
    String hostname = "www.some-ssh-server.com";
    int port = 22;

    // Connect to an SSH server:
    boolean success = ssh.Connect(hostname,port);
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Wait a max of 5 seconds when reading responses..
    ssh.put_IdleTimeoutMs(5000);

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Once the SSH object is connected and authenticated, we use it
    // in our SCP object.
    CkScp scp = new CkScp();

    success = scp.UseSsh(ssh);
    if (success != true) {
        System.out.println(scp.lastErrorText());
        return;
        }

    String remotePath = "images/starfish.jpg";

    // Download the binary file and return as a base64 string.
    // See <a href="http://www.cknotes.com/chilkat-binary-encoding-list/">List of Encodings</a> for a list of possible encodings.
    String encodedJpg = scp.downloadBinaryEncoded(remotePath,"base64");
    if (scp.get_LastMethodSuccess() != true) {
        System.out.println(scp.lastErrorText());
        return;
        }

    remotePath = "images/starfish2.jpg";

    // Now upload from the base64 string to the SSH server.
    // Insided the call to UploadBinaryEncoded, the base64 string is decoded,
    // and the decoded bytes are uploaded.  The resulting starfish2.jpg on the
    // server will be identical to the original starfish.jpg
    success = scp.UploadBinaryEncoded(remotePath,encodedJpg,"base64");
    if (success != true) {
        System.out.println(scp.lastErrorText());
        return;
        }

    System.out.println("SCP download/upload binary encoded success.");

    // Disconnect
    ssh.Disconnect();
  }
}

 

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