Question

I use swingworkers to extract zipfile and also append extraction prosecc to the textArea in the GUI. It extract only one item from zipped file and didn’t show up anything in the textArea.

Can anyone suggest any solution?

public class UnzipWorkers extends SwingWorker<String,Void> {
private WebTextArea statusTextArea;
private File archive,outputDir;

public UnzipWorkers(WebTextArea statusTextArea,File archive,File outputDir) {
    this.archive=archive;
    this.outputDir=outputDir;
    this.statusTextArea = statusTextArea;
}

@Override
protected String doInBackground() throws Exception {
        statusTextArea.append(String.valueOf(System.currentTimeMillis()));
        try {
            ZipFile zipfile = new ZipFile(archive);
            for (Enumeration e = zipfile.entries(); e.hasMoreElements(); ) {
                ZipEntry entry = (ZipEntry) e.nextElement();
                unzipEntry(zipfile, entry, outputDir);

            }
        } catch (Exception e) {
            OeExceptionDialog.show(e);
        }

    return "Extracted successfully: " + archive.getName() + "\n";  
}

@Override
protected void done() {
    super.done();
    try {
        statusTextArea.append( get());
        FileTreePanel.btnRefresh.doClick();
    } catch (InterruptedException e) {
        e.printStackTrace();  
    } catch (ExecutionException e) {
        e.printStackTrace(); 
    }
}

private String unzipEntry(ZipFile zipfile, final ZipEntry entry, File outputDir)  {
    String success = "Extracted failed: "+ entry + "\n";
    if (entry.isDirectory()) {
        createDir(new File(outputDir, entry.getName()));
    }

    File outputFile = new File(outputDir, entry.getName());
    if (!outputFile.getParentFile().exists()){
        createDir(outputFile.getParentFile());
    }
    try {
        BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
        BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
        IOUtils.copy(inputStream, outputStream);
        outputStream.close();
        inputStream.close();
        success="Extracted successfully: " + entry + "\n";
    }catch (IOException io){
        OeExceptionDialog.show(io);
    }catch (NullPointerException n){
        OeExceptionDialog.show(n);
    }catch (ArithmeticException a){
        OeExceptionDialog.show(a);
    }
    return success;
}

private void createDir(File dir) {
    if (!dir.exists()) {
        try {
            dir.mkdirs();
        } catch (RuntimeException re) {
            OeExceptionDialog.show(re);
        }
    }
}
}

Answer 1

SwingWorker isn’t designated to works this way, for periodical output from doInBackground() are there methods process() and publish(), you can

1) use Runnable#Thread instead of SwingWorker then you code works by adding JTextArea.append(), wrapped into invokeLater()

2) add process() or publish() to the SwingWorker, inside this method put IOStream and append to the JTextArea periodically

3) I’d be suggest to use method get() for implemented reason