java中image对象转化为bufferedimage对象的方法

在java中Image对象不能当作BufferedImage对象使用，这对我们进行ImageIO操作有很多不便，
下面这个方法可以将Image转化为BufferedImage使我们能方便的进行图像处理。

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;

/**
* @author Anthony Eden
*/
public class BufferedImageBuilder {

private static final int DEFAULT_IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;

public BufferedImage bufferImage(Image image) {
return bufferImage(image, DEFAULT_IMAGE_TYPE);
}

public BufferedImage bufferImage(Image image, int type) {
BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, null, null);
waitForImage(bufferedImage);
return bufferedImage;
}

private void waitForImage(BufferedImage bufferedImage) {
final ImageLoadStatus imageLoadStatus = new ImageLoadStatus();
bufferedImage.getHeight(new ImageObserver() {
public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
if (infoflags == ALLBITS) {
imageLoadStatus.heightDone = true;
return true;
}
return false;
}
});
bufferedImage.getWidth(new ImageObserver() {
public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
if (infoflags == ALLBITS) {
imageLoadStatus.widthDone = true;
return true;
}
return false;
}
});
while (!imageLoadStatus.widthDone && !imageLoadStatus.heightDone) {
try {
Thread.sleep(300);
} catch (InterruptedException e) {

}
}
}

class ImageLoadStatus {

public boolean widthDone = false;
public boolean heightDone = false;
}

}