69830

Progress bar freezing while downloading file in java [duplicate]

<strong>Possible Duplicate:</strong> JProgressBar wont update

So I am trying to show the download progress of a file being downloaded in Java. I can output the current percentage as a String to the console, but when I try to update the UI, it freezes until the download is complete.

public void downloadFile(String fileName) { try { long startTime = System.currentTimeMillis(); System.out.println("Connecting to site...\n"); URL url = new URL("http://assets.minecraft.net/"+fileName+"/minecraft.jar"); URLConnection connection = url.openConnection(); try (InputStream reader = url.openStream(); FileOutputStream writer = new FileOutputStream("minecraft.jar")) { byte[] buffer = new byte[153600]; int totalBytesRead = 0; int bytesRead = 0; int totalSize = connection.getContentLength(); jProgressBar1.setMaximum(totalSize); System.out.println("Downloading\n"); while ((bytesRead = reader.read(buffer)) > 0) { writer.write(buffer, 0, bytesRead); buffer = new byte[153600]; totalBytesRead += bytesRead; jProgressBar1.setValue(totalBytesRead); System.out.println(totalBytesRead*100/totalSize+"% complete"); } long endTime = System.currentTimeMillis(); System.out.println("Done. " + (new Integer(totalBytesRead).toString()) + " bytes read (" + (new Long(endTime - startTime).toString()) + " millseconds).\n"); } } catch (MalformedURLException e) { } catch (IOException e) { } }

I read somewhere that you need to use another thread but I was unable to successfully do that.

Answer1:

One option would be using SwingWorker. Here are some useful answers you may consider:

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