Java

HTTP Download with Progress Event Callbacks

See more HTTP Examples

Downloads a file via HTTP or HTTPS and uses event callbacks to monitor progress. Java

import com.chilkatsoft.*;

public class httpProgress extends CkHttpProgress
  {

  public boolean AbortCheck()
    {
    boolean abort = false;
    // Application code goes here.
    // Return true to abort, false to continue.
    return abort;
    }

  public boolean PercentDone(int percentDone)
    {
    boolean abort = false;
    System.out.println("Percent Done: " + percentDone);
    // Explicitly abort at 25% or greater.
    // Remove this to allow for the HTTP download to run to completion.
    if (percentDone > 25) {
        abort = true;
        }
    // Return true to abort, false to continue.
    return abort;
    }

  public void ProgressInfo(String name, String value)
    {
    System.out.println(name + ": " + value);
    return;
    }

};

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[])
  {
    boolean success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();
    httpProgress http_progress = new httpProgress();
    http.put_EventCallbackObject(http_progress);

    // Set a heartbeat in milliseconds 
    http.put_HeartbeatMs(200);

    // Download a file...
    String localFilePath = "qa_output/Python-3.4.4.tar.xz";
    success = http.Download("https://www.python.org/ftp/python/3.4.4/Python-3.4.4.tar.xz",localFilePath);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("OK!");
  }
}