Java Swing以饼图forms显示进度

我想以饼形格式展示进展。 有人可以帮忙吗？ 我有要显示的数据，但是如何以这种格式显示它。 我们下载文件时谷歌浏览器中显示的进度。

Answer 1

基于@trashgod提供的链接，这是一种可以实现“饼图”效果的方法。 这只处理不确定的进度条，但添加“确定”行为非常容易。

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.RenderingHints; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JProgressBar; import javax.swing.plaf.basic.BasicProgressBarUI; /** @see http://stackoverflow.com/questions/8884297 */ public class ProgressBarUITest extends JPanel { public ProgressBarUITest() { super(new BorderLayout()); JProgressBar jpb = new JProgressBar(); jpb.setUI(new MyProgressUI()); jpb.setForeground(Color.GRAY); jpb.setIndeterminate(true); this.add(jpb); } private static class MyProgressUI extends BasicProgressBarUI { private static final int ARC_EXTENT = 25; @Override protected void installDefaults() { super.installDefaults(); progressBar.setBorder(null); } @Override protected void paintIndeterminate(Graphics g, JComponent c) { int angle = (int) (90 - 360.0 * getAnimationIndex() / getFrameCount()); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.setColor(progressBar.getForeground()); int size = Math.min(c.getWidth(), c.getHeight()); g2d.fillArc((c.getWidth() - size) / 2, (c.getHeight() - size) / 2, size, size, angle - ARC_EXTENT, ARC_EXTENT); } @Override protected Rectangle getBox(Rectangle r) { if (r != null) { r.setBounds(progressBar.getBounds()); return r; } return progressBar.getBounds(); } @Override public Dimension getPreferredSize(JComponent c) { return new Dimension(100, 100); } } private void display() { JFrame f = new JFrame("ProgressBarUITest"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(this); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new ProgressBarUITest().display(); } }); } }