java Swing怎么设置JPanel背景图片为gif动画？？？？？？背景加gif动画只能静态显

java Swing怎么设置JPanel背景图片为gif动画？？？？？？背景加gif动画只能静态显

public class GifComponent extends JComponent {
private static final long serialVersionUID = 1L;
private GifBean[] gifBeans;
private Map gifBeanMap = new HashMap();
private int index = 0;
private int delayFactor;
private Timer timer;


public GifComponent(File gifFile, int delayFactor) {
setDelayFactor(delayFactor);
setGifFile(gifFile);
}


public void setGifFile(File gifFile) {
ImageReader reader = null;
try {
ImageInputStream imageIn = ImageIO.createImageInputStream(gifFile);
Iterator iter = ImageIO
.getImageReadersByFormatName("gif");
if (iter.hasNext()) {
reader = iter.next();
}
reader.setInput(imageIn, false);
gifBeanMap.clear();
gifBeans = new GifBean[reader.getNumImages(true)];
GIFImageMetadata meta = null;
for (int i = 0; i < gifBeans.length; i++) {
meta = (GIFImageMetadata) reader.getImageMetadata(i);
gifBeans[i] = new GifBean();
gifBeans[i].image = reader.read(i);
gifBeans[i].x = meta.imageLeftPosition;
gifBeans[i].y = meta.imageTopPosition;
gifBeans[i].width = meta.imageWidth;
gifBeans[i].height = meta.imageHeight;
gifBeans[i].disposalMethod = meta.disposalMethod;
gifBeans[i].delayTime = meta.delayTime == 0 ? 1
: meta.delayTime;
}
for (int i = 1; i < gifBeans.length; i++) {
if (gifBeans[i].disposalMethod == 2) {
gifBeanMap.put(new Integer(i), new Integer[] { i });
continue;
}
int firstIndex = getFirstIndex(i);
List list = new ArrayList();
for (int j = firstIndex; j <= i; j++) {
list.add(j);
}
gifBeanMap.put(new Integer(i), list.toArray(new Integer[] {}));
}
} catch (IOException e) {
e.printStackTrace();
}
setTimer();
}

private synchronized void setTimer() {
if (timer != null) {
timer.cancel();
}
timer = new Timer("show gif");
timer.schedule(new TimerTask() {
@Override
public void run() {
repaint();
try {
Thread.sleep(gifBeans[index].delayTime * delayFactor);
} catch (InterruptedException e) {
}
index++;
if (index >= gifBeans.length) {
index = 0;
}
}

}, 0, 1);

}


public void setDelayFactor(int delayFactor) {
this.delayFactor = delayFactor;
}

@Override
protected void paintComponent(Graphics g) {
g.drawImage(gifBeans[0].image, gifBeans[0].x, gifBeans[0].y, this);
if (index > 0) {
Integer[] array = gifBeanMap.get(index);
for (Integer i : array) {
g.drawImage(gifBeans[i].image, gifBeans[i].x, gifBeans[i].y,
this);
}
}
}

private int getFirstIndex(int index) {
int tempIndex = index;
while (tempIndex > 1) {
if (tempIndex - 1 > 0
&& gifBeans[tempIndex - 1].disposalMethod == 2) {
return index;
}
tempIndex--;
}
return tempIndex;
}


public class GifBean {
public BufferedImage image;
public int x;
public int y;
public int width;
public int height;
public int disposalMethod;
public int delayTime;
}

}
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