import java.awt.Colorimport java.awt.Toolkitimport javax.swing.ImageIconimport javax.swing.JLabelimport javax.swing.JOptionPaneimport javax.swing.JProgressBarimport javax.swing.JWindow@SuppressWarnings("serial") public class Demo extends JWindow implements Runnable { // 定义加载窗口大小 public static final int LOAD_WIDTH = 455public static final int LOAD_HEIGHT = 295// 获乎亏含取屏幕窗口大小 public static final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().widthpublic static final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height// 定义进度条组件 public JProgressBar progressbar// 定义标签组件 public JLabel label// 构造函数 public Demo() { // 创建标签,并在标签上放置一张图片 label = new JLabel(new ImageIcon("images/background.jpg"))label.setBounds(0, 0, LOAD_WIDTH, LOAD_HEIGHT - 15)// 创建进度空唯条 progressbar = new JProgressBar()// 显示当前进度值信息 progressbar.setStringPainted(true)// 设置进度条边框不显示 progressbar.setBorderPainted(false)// 设置进度条的前景色 progressbar.setForeground(new Color(0, 210, 40))// 设置进度条的背景色 progressbar.setBackground(new Color(188, 190, 194))progressbar.setBounds(0, LOAD_HEIGHT - 15, LOAD_WIDTH, 15)// 添加组件 this.add(label)this.add(progressbar)// 设岁笑置布局为空 this.setLayout(null)// 设置窗口初始位置 this.setLocation((WIDTH - LOAD_WIDTH) / 2, (HEIGHT - LOAD_HEIGHT) / 2)// 设置窗口大小 this.setSize(LOAD_WIDTH, LOAD_HEIGHT)// 设置窗口显示 this.setVisible(true)} public static void main(String[] args) { Demo t = new Demo()new Thread(t).start()} @Override public void run() { for (int i = 0i <100i++) { try { Thread.sleep(100)} catch (InterruptedException e) { e.printStackTrace()} progressbar.setValue(i)} JOptionPane.showMessageDialog(this, "加载完成")this.dispose()} }
直接上官方示例
import java.awt.*import java.awt.event.*
import javax.swing.*
import java.beans.*
import java.util.Random
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()
}
})
}
}
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