java 图片插入另一张图片

public static void mergeImage(String bigPath,String smallPath,String x,String y) throws IOException {

        try {
            BufferedImage small ;
            BufferedImage big = ImageIO.read(new File(bigPath));
            if(smallPath.contains("http")){

                URL url = new URL(smallPath);
                small = ImageIO.read(url);
            }else{
                small = ImageIO.read(new File(smallPath));
            }

            Graphics2D g = big.createGraphics();

            float fx = Float.parseFloat(x);
            float fy = Float.parseFloat(y);
            int x_i = (int)fx;
            int y_i = (int)fy;
            g.drawImage(small, x_i, y_i,small.getWidth(),small.getHeight(), null);
            g.dispose();
            ImageIO.write(big, "png", new File(bigPath));

        } catch (Exception e) {
                e.printStackTrace();
        }

    }