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Problems adding JTextArea

I am creating a backup program, and I need everything I have, a backup of the program is displayed on JTextArea. well, it works, but only after the program ends with the backup. How to fix it? The code I'm running is located here:

backup method

public void startBackup() throws Exception {
    // txtarea is the JTextArea
    Panel.txtArea.append("Starting Backup...\n");

    for (int i = 0; i < al.size(); i++) {
        //al is an ArrayList that holds all of the backup assignments selected
        // from the JFileChooser

        File file = new File((String) al.get(i));
        File directory = new File(dir);

        CopyFolder.copyFolder(file, directory);
            }
     }

Copy folder class:

public class CopyFolder {
public static void copyFolder(File src, File dest) throws IOException {

    if (src.isDirectory()) {

        // if directory not exists, create it
        if (!dest.exists()) {
            dest.mkdir();
            Panel.txtArea.append("Folder " + src.getName()
                    + " was created\n");
        }

        // list all the directory contents
        String files[] = src.list();

        for (String file : files) {
            // construct the src and dest file structure
            File srcFile = new File(src, file);
            File destFile = new File(dest, file);
            // recursive copy
            copyFolder(srcFile, destFile);
        }

    } else {
        try {
            CopyFile.copyFile(src, dest);
        } catch (Exception e) {
        }
    }
}
    }

Class copyfile

public class CopyFile {

public static void copyFile(File src, File dest) throws Exception {
    // if file, then copy it
    // Use bytes stream to support all file types
    InputStream in = new FileInputStream(src);
    OutputStream out = new FileOutputStream(dest);

    byte[] buffer = new byte[1024];

    int length;
    // copy the file content in bytes
    while ((length = in.read(buffer)) > 0) {
        out.write(buffer, 0, length);
    }

    in.close();
    out.close();
    // System.out.println("File copied from " + src + " to " + dest);
    Panel.txtArea.append("File copied " + src.getName() + "\n");
}
    }

Thanks for the help in advance, and let me know about any help I can give. I did a google search, and this seems to be a big problem, but I just can't think how to fix it. Oh, and please do not do it directly, because it does not apply to you, it greatly aggravates the situation. Thanks in advance!

EDIT : This is what I got:

public class test extends SwingWorker<Void, String> {
String txt;
JTextArea txtArea = null;

public test(JTextArea txtArea, String str) {
    txt = str;
    this.txtArea = txtArea;
}

protected Void doInBackground() throws Exception {

    return null;
}

protected void process(String str) {
    txtArea.append(str);
}

protected void getString() {
    publish(txt);
}
    }
+3
source
1

, , , Event Dispatching Thread. , repaint , .

, (.. ) .

Concurrency Swing Trail, . , , , SwingWorker

doInBackground process

, . C:\ 3- JTextArea

public class BackgroundWorker extends SwingWorker<Object, File> {

    private JTextArea textArea;

    public BackgroundWorker(JTextArea textArea) {

        this.textArea = textArea;

    }

    @Override
    protected Object doInBackground() throws Exception {

        list(new File("C:\\"), 0);

        return null;

    }

    @Override
    protected void process(List<File> chunks) {

        for (File file : chunks) {

            textArea.append(file.getPath() + "\n");

        }

        textArea.setCaretPosition(textArea.getText().length() - 1);

    }

    protected void list(File path, int level) {

        if (level < 4) {

            System.out.println(level + " - Listing " + path);

            File[] files = path.listFiles(new FileFilter() {

                @Override
                public boolean accept(File pathname) {

                    return pathname.isFile();

                }
            });

            publish(path);
            for (File file : files) {

                System.out.println(file);
                publish(file);

            }

            files = path.listFiles(new FileFilter() {

                @Override
                public boolean accept(File pathname) {

                    return pathname.isDirectory() && !pathname.isHidden();

                }
            });

            for (File folder : files) {

                list(folder, level + 1);

            }

        }

    }

}

new BackgroundWorker(textField).execute() : D

public class BackgroundWorker extends SwingWorker<Object, String> {

    private JTextArea textArea;
    private File sourceDir;
    private File destDir;

    public BackgroundWorker(JTextArea textArea, File sourceDir, File destDir) {

        this.textArea = textArea;
        this.sourceDir = sourceDir;
        this.destDir = destDirl

    }

    @Override
    protected Object doInBackground() throws Exception {

        if (sourceDir.isDirectory()) {

            // if directory not exists, create it
            if (!destDir.exists()) {
                destDir.mkdir();
                publish("Folder " + sourceDir.getName() + " was created");
            }

            // list all the directory contents
            String files[] = sourceDir.list();

            for (String file : files) {
                // construct the src and dest file structure
                File srcFile = new File(sourceDir, file);
                File destFile = new File(destDir, file);
                // recursive copy
                copyFolder(srcFile, destFile);
            }

        } else {
            try {
                copyFile(sourceDir, destDir);
            } catch (Exception e) {
            }
        }

        return null;

    }

    public void copyFolder(File src, File dest) throws IOException {

        if (src.isDirectory()) {

            // if directory not exists, create it
            if (!dest.exists()) {

                publish("Folder " + src.getName() + " was created");
            }

            // list all the directory contents
            String files[] = src.list();

            for (String file : files) {
                // construct the src and dest file structure
                File srcFile = new File(src, file);
                File destFile = new File(dest, file);
                // recursive copy
                copyFolder(srcFile, destFile);
            }

        } else {
            try {
                copyFile(src, dest);
            } catch (Exception e) {
            }
        }
    }

    public void copyFile(File src, File dest) throws Exception {
        // if file, then copy it
        // Use bytes stream to support all file types
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dest);

        byte[] buffer = new byte[1024];

        int length;
        // copy the file content in bytes
        while ((length = in.read(buffer)) > 0) {
            out.write(buffer, 0, length);
        }

        in.close();
        out.close();
        publish("File copied " + src.getName());

    }

    @Override
    protected void process(List<String> chunks) {

        for (String msg : chunks) {

            textArea.append(msg + "\n");

        }

        textArea.setCaretPosition(textArea.getText().length() - 1);

    }
}

...

new BackgroundWorker(textArea, sourceDir, destDir).execute();
+5

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