Graphics2D 圆角图片

可以使用 Graphics2D 绘制圆角图片，具体实现可以参考以下代码：

public static BufferedImage makeRoundedCorner(BufferedImage image, int cornerRadius) {
    int w = image.getWidth();
    int h = image.getHeight();
    BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2 = output.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(Color.WHITE);
    g2.fill(new RoundRectangle2D.Float(, , w, h, cornerRadius, cornerRadius));
    g2.setComposite(AlphaComposite.SrcIn);
    g2.drawImage(image, , , null);
    g2.dispose();

    return output;
}