Progress Bar

[Jason Kretzer]

I have an executable jar that extracts files from itself. I would like to have a JProgressBar show the progress of this. Below is the code I use for extraction. How can I implement a JProgressBar to use this? I would like to increment it with each "buffered IO dump".

JarFile thisJar = new JarFile("some.jar");
Enumeration enum = thisJar.entries();
enum.nextElement();
File dir = null;
JarEntry je=null;
InputStream is=null;
BufferedInputStream bi=null;
FileOutputStream fos=null;
BufferedOutputStream bo=null;
//fileList is an array of Strings each is a name 
//of a jar entry
for(int i = 0;i<fileList.length;i++)
{
   String str = fileList[i].toString();
   
   if(str.indexOf('.',0)==-1)
   {
      dir = fileList[i].getParentFile();
dir.mkdirs();
fileList[i].mkdirs();
continue;
   }
   
   je = ((JarEntry)enum.nextElement());
   is = getClass().getClassLoader().getResourceAsStream(je.toString());
   bi = new BufferedInputStream(is,16384);
   fos = new FileOutputStream(fileList[i]);
   bo = new BufferedOutputStream(fos,16384);
   try 
   {
      while(true) 
      {
         byte [] byteArray = new byte[16384];
         int intRead = bi.read(byteArray, 0, byteArray.length);
         bo.write(byteArray, 0, intRead);
         bo.flush();
      }
   }
   catch (Exception k) 
   {
      k.printStackTrace(ps); 
     //System.out.println("There were problems extracting the Jar!");*/
   }
   bi.close();
   bo.close();
}

Thanks in advance,

[Michael Morris]

Hi Jason,
Probably the best way to do this is to construct a JProgressBar and a Timer (javax.swing.Timer). Then add an ActionListener to the Timer and in the actionPerformed method update the Progress Bar. You'll probably have to experiment with how often the Timer fires to get the granularity you want. As you probably know you shouldn't modify any swing components outside the event thread, so don't be tempted to just update the Progress bar on the fly.
One other possibility you may check out is the ProgressMonitor class.
Hope this helps
Michael Morris
SCJP2
[ March 25, 2002: Message edited by: Michael Morris ]