java生成一张图片

public class CreateImage {

	public static void main(String[] args) throws Exception{

		int width = 100;

        int height = 100;

        String s = "你好";

        File file = new File("/Users/tengxin/Pictures/image.jpg");

        Font font = new Font("Serif", Font.BOLD, 10);

        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics2D g2 = (Graphics2D)bi.getGraphics();

        g2.setBackground(Color.WHITE);

        g2.clearRect(0, 0, width, height);

        g2.setPaint(Color.RED);

        FontRenderContext context = g2.getFontRenderContext();

        Rectangle2D bounds = font.getStringBounds(s, context);

        double x = (width - bounds.getWidth()) / 2;

        double y = (height - bounds.getHeight()) / 2;

        double ascent = -bounds.getY();

        double baseY = y + ascent;

        g2.drawString(s, (int)x, (int)baseY);

        ImageIO.write(bi, "jpg", file);

	}

}