我希望我能在这里提出正确的问题，但随时可以向我询问任何其他信息。 我正在尝试用Java编写一个程序来处理textarea中的一大块代码。 该程序完全符合我的预期，但可能需要一些时间，因此我想将JProgressBar放在将要更新的对话框上。 我已经查看了进度条上的oracle示例，并尝试执行http://docs.oracle.com/javase/tutorial/uiswing/components/progress.html
中的示例这使用了一个足够简单的例子......
doinBackground()方法的背景。 setProgress()方法更新进度。propertychangelistener 据我理解，当ProgressBarDemo调用Task时，它会将自己的propertychangelistener与任务相关联，当Task调用setprogress()时，数据更改为广播到ProgressBarDemo propertyChange(evt)方法。
这完美地作为一个例子。
public class ProgressBarDemo extends JPanel
implements ActionListener,
PropertyChangeListener {
private JProgressBar progressBar;
private JButton startButton;
private JTextArea taskOutput;
private Task task;
class Task extends SwingWorker<Void, Void> {
/*
* Main task. Executed in background thread.
*/
@Override
public Void doInBackground() {
Random random = new Random();
int progress = 0;
//Initialize progress property.
setProgress(0);
while (progress < 100) {
//Sleep for up to one second.
try {
Thread.sleep(random.nextInt(1000));
} catch (InterruptedException ignore) {
}
//Make random progress.
progress += random.nextInt(10);
setProgress(Math.min(progress, 100));
}
return null;
}
/*
* Executed in event dispatching thread
*/
@Override
public void done() {
Toolkit.getDefaultToolkit().beep();
startButton.setEnabled(true);
setCursor(null); //turn off the wait cursor
taskOutput.append("Done!\n");
}
}
public ProgressBarDemo() {
super(new BorderLayout());
//Create the demo's UI.
startButton = new JButton("Start");
startButton.setActionCommand("start");
startButton.addActionListener(this);
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);
JPanel panel = new JPanel();
panel.add(startButton);
panel.add(progressBar);
add(panel, BorderLayout.PAGE_START);
add(new JScrollPane(taskOutput), BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
}
/**
* Invoked when the user presses the start button.
*/
public void actionPerformed(ActionEvent evt) {
startButton.setEnabled(false);
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
//Instances of javax.swing.SwingWorker are not reusuable, so
//we create new instances as needed.
task = new Task();
task.addPropertyChangeListener(this);
task.execute();
}
/**
* Invoked when task's progress property changes.
*/
public void propertyChange(PropertyChangeEvent evt) {
if ("progress" == evt.getPropertyName()) {
int progress = (Integer) evt.getNewValue();
progressBar.setValue(progress);
taskOutput.append(String.format(
"Completed %d%% of task.\n", task.getProgress()));
}
}
/**
* Create the GUI and show it. As with all GUI code, this must run on the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//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 ProgressBarDemo();
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) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
从示例中可以看出，没有revalidate（）invalidate（）repaint（）等实例，并且一切都按原样运行，但是，我试图为我的更改和图形重新创建这种方法不会更新。
我也在打印到控制台，这个输出很简单，但不管我做什么，我都无法让JProgressBar更新。 如果我包含一个按钮来增加JProgressbar，它将起作用并且JProgress栏将更新，但是在运行SwingWorker之后，即使我包含revalidate（）等，JProgressbar也不再以图形方式响应。
我还在方法中包含了jrogck之前和之后的JProgressbar中的值，并且每次都包含正确的值...它只是不会更新Dialog !!!
任何帮助...... 请！
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package db_udt_searchandreplacetest;
import Model.VariableListProcessor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
/**
*
* @author Alan Curley
*/
public class Dialog1 extends javax.swing.JFrame
implements ActionListener,
PropertyChangeListener {
/**
* Creates new form Dialog1
*/
public Dialog1() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jSeparator1 = new javax.swing.JSeparator();
jScrollPane1 = new javax.swing.JScrollPane();
SourceCode = new javax.swing.JTextArea();
goButton = new javax.swing.JButton();
jProgressBar1 = new javax.swing.JProgressBar();
updateTheFlippingProgressBar = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
SourceCode.setColumns(20);
SourceCode.setFont(new java.awt.Font("Corbel", 0, 13)); // NOI18N
SourceCode.setRows(5);
SourceCode.setText("Paste Source code here.");
jScrollPane1.setViewportView(SourceCode);
goButton.setText("GO");
goButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
goButtonActionPerformed(evt);
}
});
jProgressBar1.setStringPainted(true);
updateTheFlippingProgressBar.setText("UTFPB");
updateTheFlippingProgressBar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
updateTheFlippingProgressBarActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jSeparator1)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(goButton)
.addGap(18, 18, 18)
.addComponent(jProgressBar1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addComponent(updateTheFlippingProgressBar)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 205, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(goButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jProgressBar1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(updateTheFlippingProgressBar)
.addGap(5, 5, 5))
);
pack();
}// </editor-fold>
/**
* This is the function called when the user presses the "GO" Button.
* @param evt
*/
private void goButtonActionPerformed(java.awt.event.ActionEvent evt) {
// Update the Progressbar to include a new Maximum count.
jProgressBar1.setMaximum(SourceCode.getLineCount());
VariableListProcessor VPL = new VariableListProcessor(SourceCode);
VPL.addPropertyChangeListener(this); // Sdet this class (Dialog1) as the propertychange listener.
//java.awt.EventQueue.invokeLater(VPL);
VPL.execute();
System.out.println("GO Pressed: "+String.valueOf(jProgressBar1.getValue()));
}
private void updateTheFlippingProgressBarActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jProgressBar1.setValue(jProgressBar1.getValue()+1);
if(jProgressBar1.getValue()>99)
jProgressBar1.setValue(0);
this.validate();
this.repaint();
System.out.println("UTFPB Pressed: "+String.valueOf(jProgressBar1.getValue()));
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Dialog1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Dialog1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Dialog1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Dialog1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Dialog1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextArea SourceCode;
private javax.swing.JButton goButton;
private javax.swing.JProgressBar jProgressBar1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JButton updateTheFlippingProgressBar;
// End of variables declaration
// called when an action is triggered.
@Override
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("<<<< actionPerformed(): Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
// called when a property change being listened for is detected.
@Override
public void propertyChange(PropertyChangeEvent evt) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
if ("progress" == evt.getPropertyName()) {
int progress = (Integer) evt.getNewValue();
jProgressBar1.setValue(progress);
System.out.println("P:"+String.valueOf(jProgressBar1.getValue()));
jProgressBar1.repaint();
}
}
}
此类位于另一个文件中。
package Model;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.*;
/**
* This is the swingworker class that will take the string object that contains
* the source code and builds the VariableList object from the Data.
* @author Alan Curley
*/
public class VariableListProcessor extends SwingWorker<Void,Integer> {
JTextArea source;
Integer i = 0;
public VariableListProcessor(JTextArea source){
this.source = source;
i = 0;
}
public void setSource(JTextArea source){
this.source = source;
}
// This is the method that will be called in the background to allow the thread to run.
// We can update the progress property of the class to report back how it is working.
// Called when the "Execute" command is given???
@Override
protected Void doInBackground() throws InterruptedException{
// it is here we set up the Loop to go through Source, line by line and translate the variables into something
// more meaningful.
// Clear the progress settings.
Integer percProgress;
i = 0;
//setProgress(0);
// build an Arraylist of Strings that represent each line in the source code.
ArrayList<String> sourceCodeList;
sourceCodeList = new ArrayList();
sourceCodeList.addAll(Arrays.asList(source.getText().split("\\n")));
for (String S:sourceCodeList){
if(S.matches("TYPE\\W*UDT\\W+\\d+.*"))
System.out.println(S);
percProgress = ((++i)*100/source.getLineCount());
publish(percProgress);
/*if(!(oldPercProgress.equals(percProgress)))
{
try{ ///
Thread.sleep(100);
/*
}catch(InterruptedException ignore){}
oldPercProgress = percProgress;
} */
// if(i.equals(269))
// System.out.println(String.valueOf(i)+"\t"+S);
}
return null;
//throw new UnsupportedOperationException("<<<< VPL-doInBackground(): Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
protected void done(){
System.out.println("Complete. :-)");
JOptionPane.showMessageDialog(null, "Complete", "Complete", JOptionPane.INFORMATION_MESSAGE);
//throw new UnsupportedOperationException("<<<< VPL-done(): Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
// Can safely update the GUI from this method.
protected void process(List<Integer> chunks) {
// Here we receive the values that we publish().
// They may come grouped in chunks.
int mostRecentValue = chunks.get(chunks.size()-1);
setProgress(mostRecentValue);
}
}
答案 0 :(得分：0)
我想我可能已经找到了......
＆＃34; goButtonActionPerformed（）方法中的行jProgressBar1.setMaximum(SourceCode.getLineCount());＆＃34;最初使用，因为我希望这个数量计算到最大值，但不计算行数的百分比。
在我设置＆＃34; progress（）＆＃34;到100，＆＃34;完成＆＃34;方法是调用并结束例程。
我把它改回了一个百分比，但错误地将上面的一行留下了。当我删除它时，它现在正常工作。经验教训嗯？