Hi, I'm new. Need help bad!

Now I am developing an embeded jar file to make a special game client for a java game on my website.

Ok Here is what I have in my NetBeans IDE. (This is just a segment of one class of many, I transfered it to my NetBeans for quick testing purposes).

The point is, it has to fetch the game files from my server and download them to the client's computer. I already programmed in downloading, and an updating system. It functions flawlessly. What I am working on now is a loading bar. The loading bar isn't swing for the client, it is UI inside the client. I am just using swing because I'm testing in NetBeans.

::::MY PROBLEM::::
I can calculate how many bytes have been transferred so far, but I do not know how to find the total size of the value before it is all transferred over.
I labeled where in the code box as "///////HERE///////////".

Can someone tell me what I must do to get the total bytes of the file before it downloads so I can make an accurate loading bar?

Code:

---

public class HelloWorldApp
{
  public static String[] dB = {""};
  protected static final void createdrive()
    {
        File file = new File((new StringBuilder()).append(System.getProperty("user.home")).append(File.separator).append("FlameScape_Cache").toString());
        if(file.exists())
        {
            return;
        } else
        {
            file.mkdir();
            System.out.println("Created cache dir");
            return;
        }
    }
  public static void loadCacheFromMirrors()
    {
        createdrive();
        ArrayList arraylist = new ArrayList();
        arraylist.add("//LINK TO THE DATA DIRECTORY//");
        dB = (String[])arraylist.toArray(new String[arraylist.size()]);
        System.out.println((new StringBuilder()).append("Loaded ").append(dB.length).append(" data mirrors").toString());
    }
  public static final File loadcache(String s1, JProgressBar progressbar)
    {
        progressbar.setIndeterminate(true);
        progressbar.setString("Analyzing " + s1);
        File file = new File((new StringBuilder()).append(System.getProperty("user.home")).append(File.separator).append("FlameScape_Cache").append(File.separator).append(s1).toString());
        System.out.print(file.length());
        if(!file.isFile())
        {
            System.out.println((new StringBuilder()).append("Data file not found locally: ").append(s1).toString());
            boolean flag = false;
            ArrayList arraylist = new ArrayList();
            String as1[] = dB;
            int i1 = as1.length;
            for(int j1 = 0; j1 < i1;)
            {
                String s2 = as1[j1];
                String s3 = (new StringBuilder()).append(s2).append(File.separator).append(s1).toString();
                System.out.print((new StringBuilder()).append("\tTrying ").append(s3).append(" => ").toString());
                try
                {
                    HttpURLConnection httpurlconnection = (HttpURLConnection)(new URL(s3)).openConnection();
                    if(httpurlconnection.getResponseCode() != 200)
                    {
                        System.out.println("Unable to obtain file. (" + httpurlconnection.getResponseCode() + ")");
                        continue;
                    }
                    System.out.print("Downloading.. ");
                    InputStream inputstream = httpurlconnection.getInputStream();
                    file.createNewFile();
                    FileOutputStream fileoutputstream = new FileOutputStream(file);
                    int Total = ///////HERE///////////;
                    progressbar.setIndeterminate(false);
                    byte abyte1[] = new byte[1024];
                    int Progress = 0;
                    for(int k1 = 0; (k1 = inputstream.read(abyte1)) != -1;) {
                        Progress = Progress + abyte1.length;
                        fileoutputstream.write(abyte1, 0, k1);
                        progressbar.setValue(Math.round((Progress/Total)*100));
                        progressbar.setString(Math.round((Progress/Total)*100)) + "%");

                    }
                    inputstream.close();
                    fileoutputstream.close();
                    System.out.println("Done.");
                    break;
                }
                catch(Exception exception1)
                {
                    System.out.println("Unable to obtain file.");
                    arraylist.add(exception1);
                    j1++;
                }
            }

            if(arraylist.size() == dB.length)
            {
                System.out.println((new StringBuilder()).append("Downloading data file ").append(s1).append(" failed.\nPlease report the error, and include the following exception data:").toString());
                Exception exception;
                for(Iterator iterator = arraylist.iterator(); iterator.hasNext(); exception.printStackTrace())
                    exception = (Exception)iterator.next();

                System.exit(1);
            }
        } else {
            System.out.println("The file: " + s1 + " has been found locally.");
            System.out.print((new StringBuilder()).append("\tTesing Checksum (").append(s1).append(")").append(" => ").toString());
            String CHECKSUM1 = "";
            String CHECKSUM2 = "";
            try {
                CHECKSUM1 = MD5Checksum.getMD5Checksum(file.getPath());
                URL CheckServ = new URL("//LINK TO DATA DIRECTORY//remotechecksum.php?file=" + s1);
                URLConnection yc = CheckServ.openConnection();
                BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
                String inputLine;
                while ((inputLine = in.readLine()) != null) {
                    CHECKSUM2 = inputLine;
                    break;
                }
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            System.out.print("(1)" + CHECKSUM1 + ".. (2)" + CHECKSUM2 + "..");
            if(CHECKSUM1.equalsIgnoreCase(CHECKSUM2)) {
                System.out.print("\tChecksum success.  Matching strings.");
            } else {
                System.out.println((new StringBuilder()).append("\tChecksum failed.  Nonmatching strings.").append(s1).toString());
                boolean flag = false;
                ArrayList arraylist = new ArrayList();
                String as1[] = dB;
                int i1 = as1.length;
                for(int j1 = 0; j1 < i1;)
                {
                    String s2 = as1[j1];
                    String s3 = (new StringBuilder()).append(s2).append(File.separator).append(s1).toString();
                    System.out.print((new StringBuilder()).append("\tTrying ").append(s3).append(" => ").toString());
                    try
                    {
                        HttpURLConnection httpurlconnection = (HttpURLConnection)(new URL(s3)).openConnection();
                        if(httpurlconnection.getResponseCode() != 200)
                        {
                            System.out.println("Unable to obtain file. (" + httpurlconnection.getResponseCode() + ")");
                            continue;
                        }
                        System.out.print("Downloading.. ");
                        InputStream inputstream = httpurlconnection.getInputStream();
                        file.createNewFile();
                        FileOutputStream fileoutputstream = new FileOutputStream(file);
                        byte abyte0[] = new byte[1024];
                        for(int k1 = 0; (k1 = inputstream.read(abyte0)) != -1;)
                            fileoutputstream.write(abyte0, 0, k1);

                        inputstream.close();
                        fileoutputstream.close();
                        System.out.println("Done.");
                        break;
                    }
                    catch(Exception exception1)
                    {
                        System.out.println("Unable to obtain file.");
                        arraylist.add(exception1);
                        j1++;
                    }
                }

                if(arraylist.size() == dB.length)
                {
                    System.out.println((new StringBuilder()).append("Downloading data file ").append(s1).append(" failed.\nPlease report the error, and include the following exception data:").toString());
                    Exception exception;
                    for(Iterator iterator = arraylist.iterator(); iterator.hasNext(); exception.printStackTrace())
                        exception = (Exception)iterator.next();

                    System.exit(1);
                }
            }

        }
        s1 = file.getAbsolutePath();
        return file;
    }

  public static void main(String[] args)
  {
    JFrame frame = new JFrame("ProgressBar");
    frame.setSize(200,50);
    frame.setLayout(new GridLayout());
    JProgressBar progress = new JProgressBar(0, 100);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    progress.setValue(0);
    frame.add(progress);
    frame.pack();
    progress.setStringPainted(true);
    frame.setVisible(true);
    loadCacheFromMirrors();
    loadcache("NPCs.xml.data", progress);
    loadcache("ItemDef.xml.data", progress);
    loadcache("Landscape.rscd", progress);
  }

}

---

You would need to check if they provided the content length correctly in the response header.