急java 怎么画实心圆和直线

急！！java 如何画实心圆和直线？
我需要画实心圆和他们之间的直线，并且以图片形式保存和输出

希望能给点代码看看

我只记得jfreechart上是ChartUtilities.writeChartAsJPEG(response.getOutputStream(), chart,700, 300);
就可以了，但是不用jfreechart怎么办？



万分感谢各位哥哥了。。。

[解决办法]

Java code

public class Test {        private static final int WIDTH = 200;    private static final int HEIGHT = 300;    private static final String OUT_PATH = "image.jpg";    public static void main(String[]args)    {        BufferedImage buffImg = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);        Graphics  g = buffImg.getGraphics();        g.setColor(Color.WHITE);        g.fillRect(0, 0, WIDTH, HEIGHT);        g.setColor(Color.BLACK);        g.fillOval(0, 0, 30, 30);        g.fillOval(100, 100, 30, 30);        g.drawLine(15, 15, 115, 115);        g.dispose();        ImageIcon icon = new ImageIcon(buffImg);        File f = new File(OUT_PATH);        OutputStream out;        try {            out = new FileOutputStream(f);            ImageIO.write(buffImg, "jpg", out);            out.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                                        }    }
[解决办法]
Java code
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D g2d = bi.createGraphics();Ellipse2D.Double circle = new Ellipse2D.Double(x,y,w,h);g2d.setPaint(Color.BLUE);g2d.fill(circle);Line2D.Double line = new Line2D.Double(x1,y1,x2,y2);g2d.draw(line);... // draw/fill other shapesg2.dispose();ImageIO.write(bi,"PNG",new File(...)); // write to file
[解决办法]
还应该使用 setRenderingHint(RenderingHints.Key hintKey, Object hintValue) 设置一下抗锯齿。