Java 图片里画二维图形

public static void fun1() throws IOException { 
    String path = "C:\\Users";
    File imgFile = new File( path + "\\img.png");
    File imgFile2 = new File(path + "\\img2.png");
    BufferedImage srcimg = ImageIO.read(imgFile);
    Graphics2D g2d = srcimg.createGraphics();
    g2d.drawImage(srcimg, 0, 0, null);
    Stroke dash = new BasicStroke(2.5f, BasicStroke.CAP_BUTT,
            BasicStroke.JOIN_ROUND, 3.5f, new float[]{15, 10,},
            0f);
    //虚线
    g2d.setStroke(dash);
    g2d.setColor(Color.RED);
    g2d.drawRect(56, 64, 80, 80);
    g2d.dispose();
    ImageIO.write(srcimg, "JPG", imgFile2);
}