Chilkat Examples

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Java Examples

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(Java) HTTP Download with Progress Event Callbacks

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

Note: This example explicitly aborts the download when 25% completed. Remove the code within the AbortCheck handler to allow for the download to complete.

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 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[])
  {
    // 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";
    boolean success = http.Download("https://www.python.org/ftp/python/3.4.4/Python-3.4.4.tar.xz",localFilePath);
    if (success != true) {
        System.out.println(http.lastErrorText());
        return;
        }

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

 

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