我正在開發一個java應用程序,使用bufferedInputStream保存大文件。 我已經在JDialog中放置了一個進度條,它指示上傳文件的百分比,並且每n秒增加一次。 問題是應用程序無限期地等待關閉對話框,所以它永遠不會退出。 任何人都可以提供幫助嗎?Java上傳百分比進度條線程
這裏是主應用程序的代碼片段:
JDialog dialog = new JDialog(Main.getMainFrame(), true);
ProgressBarJPanel progressBarJPanel = new ProgressBarJPanel();
dialog.setContentPane(progressBarJPanel);
dialog.pack();
dialog.setVisible(true);
while ((val = bufferedInputStream.read()) != -1)
{
fileOutputStream.write(val);
}
progressBarJPanel.end();
dialog.setVisible(false);
和牽連類
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ProgressBarJPanel extends JPanel
implements ActionListener
{
private JProgressBar progressBar;
private Timer timer;
public Thread updateThread;
public final static int ONE_SECOND = 1000;
private JTextArea taskOutput;
private String newline = "\n";
int timeNow= 0;
int progress = 0;
public ProgressBarJPanel()
{
super(new BorderLayout());
progressBar = new JProgressBar(0, 100);
progressBar.setValue(0);
progressBar.setStringPainted(true);
taskOutput = new JTextArea(5, 20);
taskOutput.setMargin(new Insets(5,5,5,5));
taskOutput.setEditable(false);
taskOutput.setCursor(null);
JPanel panel = new JPanel();
panel.add(progressBar);
add(panel, BorderLayout.PAGE_START);
add(new JScrollPane(taskOutput), BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
//Create a timer.
timer = new Timer(ONE_SECOND, new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
progressBar.setValue(progress);
progress+=10;
String s = "now at "+progress+"%";
if (s != null) {
taskOutput.append(s + newline);
taskOutput.setCaretPosition(
taskOutput.getDocument().getLength());
}
}
});
}
public void end()
{
timer.stop();
}
public void startProgress()
{
timer.start();
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI()
{
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("ProgressBarDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new ProgressBarJPanel();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args)
{
createAndShowGUI();
}
@Override
public void actionPerformed(ActionEvent e)
{
throw new UnsupportedOperationException("Not supported yet.");
}
}
- 編輯
這裏是基於ben75建議解決方案:
JDialog dialog = new JDialog(Main.getMainFrame(), true);
ProgressBarJPanel progressBarJPanel = new ProgressBarJPanel();
dialog.setContentPane(progressBarJPanel);
Runnable r = new Runnable(){
public void run(){
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
progressBarJPanel.startProgress();
dialog.pack();
dialog.setVisible(true);
}
});
//this is the long running job
while ((val = bufferedInputStream.read()) != -1)
{
fileOutputStream.write(val);
}
//here is the callback to UI thread
SwingUtilities.invokeLater(new Runnable(){
public void run(){
progressBarJPanel.end();
dialog.setVisible(false);
}
}
};
Thread t = new Thread(r);
t.start();
一個忠告:使用不同的線程耗時的工作比一個處理的UI ...... – ppeterka 2013-03-05 08:59:39
如何在兩個溝通?同樣在上面的Netbeans警告我說updateThread.start();不應該在構造函數裏面,我怎麼把它放在外面? – dendini 2013-03-05 09:02:55
查看此示例(http://stackoverflow.com/questions/15199091/progress-bar-java/15199220#15199220) – MadProgrammer 2013-03-05 09:56:36