In my simulators I am triying to include a sound file-a beep for Detectors-and a PDF file.
Getting them in the jar file is easy in EJS, you just use the Run Options, and add the User Files and the Files required ( in case of html). I was unable to find how to extract files from the jar in the javadocs of EJS. I think the information is there, but I was plainly unable to understand it.

So I got it my way: I want to extract, in runtime of the simulator, the sound and PDF files. They are beep.wav and Readme.pdf, both located in ./_data, with ./ the directory were the jar file is.

The code is



*************
public void setFile(InputStream io, String fileName)
throws IOException {
  FileOutputStream fos = new FileOutputStream(fileName);
  byte[] buf = new byte[256];
  int read = 0;
  while ((read = io.read(buf)) > 0) {
    fos.write(buf, 0, read);
  }
  fos.close();
} // end setFile

public void ExtractPDFandSound() {
  try {
    new File ("_data").mkdir();
    InputStream i =getClass().getResourceAsStream("/Juansource/Wheeler/_data/Readme.pdf");
    setFile(i,"./_data/Readme.pdf");
    i.close();
    i =getClass().getResourceAsStream("/Juansource/Wheeler/_data/beep.wav");
    setFile(i,"./_data/beep.wav");
    i.close();
    extractedResources=true;
  }
  catch (IOException ex) {
    System.out.println("Error Unpacking jar");
    extractedResources=false;
  }
} // end extract PDFandSound


public void ReadPDF() {
  if (Desktop.isDesktopSupported()) {
    try {
      File myFile = new File("./_data/Readme.pdf");
      Desktop.getDesktop().open(myFile);
    } catch (IOException ex) {
      // no application registered for PDFs
      System.out.println("Error reading PDF");
    }
  } //endif
} // end ReadPDF


public void sound () {
  if (allowSound) {
    try {
      java.applet.AudioClip clip =java.applet.Applet.newAudioClip(new java.net.URL("file:"+"./_data/beep.wav"));
      clip.play();
    }
    catch (java.net.MalformedURLException murle) {
      System.out.println(murle);
    }
  }
} // end sound



public void ResourcesdoExists() {
  File WaveFile = new File ("./_data/beep.wav");

  File PDFFile = new File ("./_data/Readme.pdf");

  if (WaveFile.exists() &&(!WaveFile.isDirectory())  && PDFFile.exists() &&(!PDFFile.isDirectory())) {
    extractedResources=true;
  }
} // end ResourcesdoExists




*************

The solution can be refined, but it works for me.

/Juansource/Wheeler/_data is the internal structure of directories in the jar file. To adapt the code, you have to change that to your personal structure.

extractedResources is a boolean variable. If true the resources already are in the disk and you don't need extract them anymore.


I am almost sure that a better way, only with relative paths, is possible, sorry for showing you the quick and dirty version, today I have no time for niceties!

Hope this will be useful.

I am using this in a new simulator about  the Wheeler's Delayed Choice Experiment in a Quantum Mechanics Mach-Zhender interferometer.

Post edited December 23, 2014 at 1:39 PM EST.