Script hanging

Question

Hi,
Im trying to make a java applet that downloads a file to a specific folder. I have managed to get the download working apart from the program hangs when downloading the file. From a little bit of searching i guess you have to use threads? But i have tried to use them but the program still hangs.
This is my first attempt at java program and any help or ideas where im going wrong would be appreciated.
This is my code
public class eccedownload extends JApplet implements ActionListener {
    private JPanel pane = null;
    private JScrollPane scrolling = null;
    private JTextPane fileBox = null;
    private JTextField tfFilename = null;
    private JButton butLoad = null;
    private final String LOAD = "load";
    private String userid;
    private String userfolder;
    private String downloadfile;
    private JProgressBar progressBar;
    public void init() {
        //Get User ID
        userid  = getParameter("id");
        //Find Documents Path
        JFileChooser chooser = new JFileChooser();
        FileSystemView view = chooser.getFileSystemView();
        userfolder = view.getDefaultDirectory()+" ";
        if(userfolder.startsWith("/")){
            userfolder=userfolder.trim()+"/eccedownloader/";
        }else{
            userfolder=userfolder.trim()+"\\eccedownloader\\";
        //Find if Folder Exists and Create if not found
        File f=new File(userfolder);
        if(f.isDirectory()==false) {
            f.mkdirs();
        //Grab File Name From Server
        try {
            URL fle = new URL("http://sandbox/eccedownload/java/filedownload.asp?id="+userid);
            BufferedReader in = new BufferedReader(
            new InputStreamReader(fle.openStream()));
            String inputLine;
            downloadfile="";
            while ((inputLine = in.readLine()) != null)
                downloadfile=downloadfile+inputLine;
            in.close();
            downloadfile.trim();
        }catch (Exception e) {
           e.printStackTrace();
        try {
            jbInit();
        } catch(Exception e) {
            e.printStackTrace();
    private void jbInit() throws Exception {
        pane = new JPanel();
        pane.setBounds(new Rectangle(0, 0, 500, 325));
        pane.setLayout(null);
        pane.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED));
        pane.setBackground(new Color(221, 194, 219));
        fileBox = new JTextPane();
        fileBox.setText(downloadfile);
        fileBox.setEditable(false);
        scrolling = new JScrollPane(fileBox);
        scrolling.setBounds(new Rectangle(16, 65, 295, 225));
        tfFilename = new JTextField();
        tfFilename.setText(userid);
        tfFilename.setBounds(new Rectangle(16, 23, 206, 29));
        butLoad = new JButton();
        butLoad.setBounds(new Rectangle(231, 23, 80, 30));
        butLoad.setText("Load");
        butLoad.setActionCommand(LOAD);
        butLoad.addActionListener(this);
        progressBar = new JProgressBar(0,100);
        progressBar.setBounds(new Rectangle(16, 65, 295, 225));
        progressBar.setValue(0);
        progressBar.setStringPainted(true);
        pane.add(progressBar);
        pane.add(scrolling);
        pane.add(tfFilename);
        pane.add(butLoad);
        setContentPane(pane);
        pane.show();
        download(downloadfile, userfolder+"test.iso");
    public void download(String address, String localFileName) {
        RandomAccessFile file = null;
        InputStream stream = null;
        OutputStream out = null;
     URLConnection conn = null;
     InputStream  in = null;
     try {
            URL url = new URL(address);
            out = new BufferedOutputStream(
            new FileOutputStream(localFileName));
            conn = url.openConnection();
            in = conn.getInputStream();
            byte[] buffer = new byte[1024];
            int numRead;
            long numWritten = 0;
            int contentLength = conn.getContentLength();
            while ((numRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, numRead);
                numWritten += numRead;
                progressBar.setValue((int) (numRead/contentLength)*100);
        } catch (Exception exception) {
            exception.printStackTrace();
     } finally {
            try {
          if (in != null) {
                    in.close();
          if (out != null) {
                    out.close();
            } catch (IOException ioe) {}
    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals(LOAD)) {
            //download(downloadfile, userfolder+"test.iso");
}

Answer 1

coxeh wrote:
Hi,
Im trying to make a java applet that downloads a file to a specific folder. I have managed to get the download working apart from the program hangs when downloading the file. From a little bit of searching i guess you have to use threads? But i have tried to use them but the program still hangs.I can't see that you have used threads at all. You are still executing within the AWT thread.
Kaj