如何从库接收字节以更新JProgressBar？

Question

I've tried to receive bytes from a lib to set my JProgressBar update for a long time but unfortunately I didn't get the result I wanted.

The problem is that I don't know how to receive bytes from a lib and how to update the JProgressBar while receiving bytes all that to make a browser with java

This is the code I've tried:

 private void jTextField1KeyPressed(java.awt.event.KeyEvent evt) {                                       
   if (evt.getKeyCode() == KeyEvent.VK_ENTER){
       String az = jTextField1.getText();


       if(az.contains("1")){
            String hh = WorkSpace.jTextField1.getText();

     URLConnection conn = null; 
     InputStream in = null;
    try {

      URL url = new URL(hh);
      conn = url.openConnection();
      in = conn.getInputStream();
      int length = conn.getContentLength(); 
      int current = 0;
      WorkSpace.jProgressBar1.setMaximum(length);
      WorkSpace.jProgressBar1.setValue(0);
      byte[] buffer = new byte[1024];
      int numRead = 0;
      while ((numRead = in.read(buffer)) != -1) {
        current=0;
          current += numRead; 
        WorkSpace.jProgressBar1.setValue(current); 

    }

    } catch (Exception e) {

    }
    }

If there's someone who knows how to do this please let me know.

Answer 1

Just wrap the input stream in a ProgressMonitorInputStream . It will manage its own JProgressBar for you.