Beispiel mit JNLP API

import javax.jnlp.*;

...

FileOpenService fos;

try {

fos=(FileOpenService)ServiceManager.lookup("javax.jnlp.FileOpenService");

} catch (UnavailableServiceException e)

{ fos = null; }

if (fos != null) {

try {

// ask user to select a file through this service

FileContents fc = fos.openFileDialog(null, null);

// as user to select multiple files through this service

FileContents [] fcs = fos.openMultiFileDialog(null, null);

} catch (Exception e)

{ e.printStackTrace(); }

}