JAVA 通过URL生成水印图

@Override
    public OutputStream watermark1(String ossURL, String logoOsskey, HttpServletResponse response) {
        lock.lock();
        OutputStream os = null;
        InputStream imageStream=null;
        //水印
        String logoPath = ossService.getOssURL(logoOsskey,bucket);
        //原图ossURL
        try {
            os=response.getOutputStream();
            imageStream = getImageStream(ossURL);
            Image image2 = ImageIO.read(imageStream);

            //获取原图信息
            int width = image2.getWidth(null);
            int height = image2.getHeight(null);

            BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
            Graphics2D g = bufferedImage.createGraphics();
            g.drawImage(image2, 0, 0, width, height, null);

//            //设置多个图片水印
            InputStream logo = getImageStream(logoPath);
            Image imageLogo = ImageIO.read(logo);

            int logoWidth = imageLogo.getWidth(null);
            int logoHeight = imageLogo.getHeight(null);
            //设置透明度,ALPHA为接口中自定义的值透明度 0.3F
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, ALPHA));

            //完成图片旋转30
            g.rotate(Math.toRadians(0), bufferedImage.getWidth() / 2, bufferedImage.getHeight() / 2);

            int x = -width / 2;
            int y = -height / 2;
            while (x < width * 1.5) {
                y = -height / 2;
                while (y < height * 1.5) {

                    g.drawImage(imageLogo, x, y, null);
                    y += logoHeight + 200;
                }
                x += logoHeight + 300;
            }
            g.dispose();
            Thumbnails.Builder thumbnail = Thumbnails.of(bufferedImage);
            thumbnail.size(x,y);
            ImageIO.write(thumbnail.asBufferedImage(),"png",os);
            //JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os);
            //en.encode(bufferedImage);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                try {
                    os.flush();
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(imageStream!=null){
                try {
                    imageStream.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }
        lock.unlock();
        return os;
    }