将Graphics2D转换为Image或BufferedImage

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;

public class Graphics2DToImage {
    public static BufferedImage toBufferedImage(Graphics2D graphics) {
        java.awt.image.ColorModel cm = graphics.getDeviceConfiguration().getColorModel(graphics.getTransform());
        WritableRaster raster = cm.createCompatibleWritableRaster(graphics.getClipBounds().width, graphics.getClipBounds().height);
        boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
        Graphics2D g2d = raster.createGraphics();
        g2d.setRenderingHints(graphics.getRenderingHints());
        g2d.setTransform(graphics.getTransform());
        g2d.setClip(graphics.getClip());
        g2d.setColor(graphics.getColor());
        g2d.setFont(graphics.getFont());
        g2d.setStroke(graphics.getStroke());
        g2d.draw(graphics.getClip());
        g2d.dispose();
        return new BufferedImage(cm, raster, isAlphaPremultiplied, null);
    }

    public static java.awt.Image toImage(Graphics2D graphics) {
        BufferedImage bufferedImage = toBufferedImage(graphics);
        return bufferedImage;
    }
}