Question

我正在制作一个GUI应用程序，在点击按钮时我们读取二进制文件并在TextArea中显示数据（数据为327680字节）。

现在，如果我使用textArea.setLine(true)，那么它会减慢执行速度，执行和释放值需要大约1分钟。

但如果我不使用textArea.setLine(true)，那么代码会在不到1秒的时间内执行。

更新后的代码。

public class App{

private static final String INPUT_FILE = "E:\\arun\\files\\Capture_Mod1.BIN";
private static final String OUTPUT_FILE = "E:\\arun\\files\\ISO_Write.BIN";
private static final String IMAGE_FILE = "E:\\arun\\files\\Image.jpg";

private JFrame frame;
private JTextArea textArea;
private JButton btnNewButton;
private ISOImageDataWorker worker;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                App window = new App();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });


}

/**
 * Create the application.
 */
public App() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    GridBagLayout gridBagLayout = new GridBagLayout();
    gridBagLayout.columnWidths = new int[]{0, 0};
    gridBagLayout.rowHeights = new int[]{0, 0, 0, 0};
    gridBagLayout.columnWeights = new double[]{1.0, Double.MIN_VALUE};
    gridBagLayout.rowWeights = new double[]{0.0, 1.0, 0.0, Double.MIN_VALUE};
    frame.getContentPane().setLayout(gridBagLayout);

    textArea = new JTextArea(5, 20); // **HERE IS THE PROBLEM**
    textArea.setLineWrap(true);
    textArea.setWrapStyleWord( true );
    JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    GridBagConstraints gbc_textArea = new GridBagConstraints();
    gbc_textArea.insets = new Insets(0, 0, 5, 0);
    gbc_textArea.gridx = 0;
    gbc_textArea.gridy = 1;
    frame.getContentPane().add(scrollPane, gbc_textArea);

    btnNewButton = new JButton("ISO 19794 Data");
    GridBagConstraints gbc_btnNewButton = new GridBagConstraints();
    gbc_btnNewButton.gridx = 0;
    gbc_btnNewButton.gridy = 2;
    frame.getContentPane().add(btnNewButton, gbc_btnNewButton);

    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            worker = new ISOImageDataWorker();
            worker.execute();
        }
    });

}

private class ISOImageDataWorker extends SwingWorker<String , Object>{

    @Override
    protected String doInBackground() throws Exception {
        String str = processData();
        return str;
    }

    @Override
    protected void done(){
        try {
            System.out.println("cm1");
            textArea.setText(get());
            System.out.println("cm2");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

public String processData(){
    DataReadWrite data = new DataReadWrite();

    //Read data
    byte[] imageData = data.readData(INPUT_FILE);
    System.out.println("Image data length is : "+ imageData.length);

    // Generate Finger Image Data General Header
    FingerImageDataGeneralHeader generateHeader = new FingerImageDataGeneralHeader();
    byte[] resultData = generateHeader.createGeneralHeader(imageData);

    // Write data to binary file
    data.writeData(resultData, OUTPUT_FILE);

    // Create Image from binary data
    CreateTiff createTiff = new CreateTiff();
    createTiff.create(resultData, IMAGE_FILE);

    String str = bytesToHex(resultData);

    return str;
}

public static String bytesToHex(byte[] bytes) {
    StringBuilder sb = new StringBuilder();
    for (byte b : bytes) {
        sb.append(String.format("%02X ", b));
    }
    return sb.toString();
}

}

我不知道我做错了什么。请帮助。

Answer 1

btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
     >> processData(); <<
        textArea.setText(str);
    }
});

不要在GUI线程（EDT）上执行耗时的代码。使用SwingWorker。

请参阅How SwingWorker works。

Swing TextArea函数setLineWrap使执行变慢

1 个答案: