Java上传百分比进度条线程

Question

我正在开发一个java应用程序，使用bufferedInputStream保存大文件。 我已经在JDialog中放置了一个进度条，它指示上传文件的百分比，并且每n秒增加一次。 问题是应用程序无限期地等待关闭对话框，所以它永远不会退出。 任何人都可以提供帮助吗？

这里是主应用程序的代码片段：

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); 

和牵连类

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."); 
    } 
} 

- 编辑

这里是基于ben75建议解决方案：

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(); 

Answer 1

你必须在另一个线程中完成时间消耗工作（即非UI线程）并在作业回调结束时回调UI线程以关闭对话框。

或多或少如何能够编码：

JDialog dialog = new JDialog(Main.getMainFrame(), true); 
ProgressBarJPanel progressBarJPanel = new ProgressBarJPanel(); 
dialog.setContentPane(progressBarJPanel); 
dialog.pack(); 
dialog.setVisible(true); 
Runnable r = new Runnable(){ 
     public void run(){ 
       //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(); 

Answer 2

这将是一个SwingWorker一份理想的工作 - 做上传的doInBackground，并将它每隔一段时间调用setProgress与最新进展号码。使用PropertyChangeListener更新进度栏并关闭done中的对话框，两者都保证在事件处理线程上运行。

在上面链接的javadoc中，有一个非常接近您需要的示例。

Answer 3

把它全部带走，并使用javax.swing.ProgressMonitorInputStream.