Streaming SFTP Download

Demonstrates how to download a file chunk by chunk from an SSH server.

Download Chilkat Java Library

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[])
  {
    //  Important: It is helpful to send the contents of the
    //  sftp.LastErrorText property when requesting support.

    CkSFtp sftp = new CkSFtp();

    //  Any string automatically begins a fully-functional 30-day trial.
    boolean success;
    success = sftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    //  Set some timeouts, in milliseconds:
    sftp.put_ConnectTimeoutMs(5000);
    sftp.put_IdleTimeoutMs(15000);

    //  Connect to the SSH server.
    //  The standard SSH port = 22
    //  The hostname may be a hostname or IP address.
    int port;
    String hostname;
    hostname = "www.my-ssh-server.com";
    port = 22;
    success = sftp.Connect(hostname,port);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    //  Authenticate with the SSH server.  Chilkat SFTP supports
    //  both password-based authenication as well as public-key
    //  authentication.  This example uses password authenication.
    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    //  After authenticating, the SFTP subsystem must be initialized:
    success = sftp.InitializeSftp();
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    //  Open a file on the server:
    String handle;
    handle = sftp.openFile("hamlet.xml","readOnly","openExisting");
    if (handle == null ) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    byte[] pData;
    CkByteData dataChunk = new CkByteData();

    boolean bEof;
    bEof = false;

    int chunkSize;
    chunkSize = 10000;
    int numBytesReceived;
    while (!bEof) {

        success = sftp.ReadFileBytes(handle,chunkSize,dataChunk);
        if (success == true) {

            //  Do whatever  you wish with the data received...
            //  It is possible that if the EOF is reached, 0 bytes will be returned.
            numBytesReceived = dataChunk.getSize();
            pData = dataChunk.toByteArray();

            System.out.println("numBytesReceived = "
                 + numBytesReceived);

        }
        else {
            System.out.println(sftp.lastErrorText());
            break;
        }

        bEof = sftp.Eof(handle);
    }

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

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