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一般来说，对于swing组件，如果要定制其图形，先把Graphics的对象转型成62616964757a686964616fe4b893e5b19e31333238656639为Graphics2D的对象也是一个常用的技巧，以便利用Graphics2D中引入的一些方法。当然，要实现透明度的逐渐改变，还需要一个线程不断的对透明度进行设置，并且更新画面。

下面是例子.自己看.

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.image.BufferedImage;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import org.jdesktop.animation.timing.Animator;

import org.jdesktop.animation.timing.Animator.Direction;

import org.jdesktop.animation.timing.Animator.RepeatBehavior;

import org.jdesktop.animation.timing.TimingTarget;

public class FadingButtonTF extends JButton

implements ActionListener, TimingTarget {

float alpha = 1.0f;

Animator animator;

int animationDuration = 2000;

BufferedImage buttonImage = null;

public FadingButtonTF(String label) {

super(label);

setOpaque(false);

animator = new Animator(animationDuration/2, Animator.INFINITE,

RepeatBehavior.REVERSE, this);

animator.setStartFraction(1.0f);

animator.setStartDirection(Direction.BACKWARD);

addActionListener(this);

}

public void paint(Graphics g) {

if (buttonImage == null || buttonImage.getWidth() != getWidth() ||

buttonImage.getHeight() != getHeight()) {

buttonImage = getGraphicsConfiguration().

createCompatibleImage(getWidth(), getHeight());

}

Graphics gButton = buttonImage.getGraphics();

gButton.setClip(g.getClip());

super.paint(gButton);

Graphics2D g2d = (Graphics2D)g;

AlphaComposite newComposite =

AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);

g2d.setComposite(newComposite);

g2d.drawImage(buttonImage, 0, 0, null);

}

public void actionPerformed(ActionEvent ae) {

if (!animator.isRunning()) {

this.setText("Stop Animation");

animator.start();

} else {

animator.stop();

this.setText("Start Animation");

// reset alpha to opaque

alpha = 1.0f;

}

}

public void begin() {}

public void end() {}

public void repeat() {}

public void timingEvent(float fraction) {

alpha = fraction;

repaint();

}

private static void createAndShowGUI() {

JFrame f = new JFrame("Fading Button TF");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setSize(300, 300);

JPanel checkerboard = new Checkerboard();

checkerboard.add(new FadingButtonTF("Start Animation"));

f.add(checkerboard);

f.setVisible(true);

}

public static void main(String args[]) {

Runnable doCreateAndShowGUI = new Runnable() {

public void run() {

createAndShowGUI();

}

};

SwingUtilities.invokeLater(doCreateAndShowGUI);

}

private static class Checkerboard extends JPanel {

private static final int DIVISIONS = 10;

static final int CHECKER_SIZE = 60;

public void paintComponent(Graphics g) {

g.setColor(Color.white);

g.fillRect(0, 0, getWidth(), getHeight());

g.setColor(Color.BLACK);

for (int stripeX = 0; stripeX < getWidth(); stripeX += CHECKER_SIZE) {

for (int y = 0, row = 0; y < getHeight(); y += CHECKER_SIZE/2, ++row) {

int x = (row % 2 == 0) ? stripeX : (stripeX + CHECKER_SIZE/2);

g.fillRect(x, y, CHECKER_SIZE/2, CHECKER_SIZE/2);

}

}

}

}

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