轉換BufferedImage 數據為byte數組

package com.ac.optimus.wap.util;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Label;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ImageUtil {

/**
* 轉換BufferedImage 數據為byte數組
*
* @param image
* Image對象
* @param format
* image格式字符串.如"gif","png"
* @return byte數組
*/
public static byte[] imageToBytes(BufferedImage bImage, String format) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
ImageIO.write(bImage, format, out);
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}

/**
* 轉換byte數組為Image
*
* @param bytes
* @return Image
*/
public static Image bytesToImage(byte[] bytes) {
Image image = Toolkit.getDefaultToolkit().createImage(bytes);
try {
MediaTracker mt = new MediaTracker(new Label());
mt.addImage(image, 0);
mt.waitForAll();
} catch (InterruptedException e) {
e.printStackTrace();
}

return image;
}
}