springBoot 從數據庫中讀取圖片流，並顯示到頁面上

HTML

<img alt="image"  th:src="'createFolw?photoId='+${photoId}+'&width=540&height=320'" >
現在瞭解到這能以這種方式來設置圖片大小

controller

@RequestMapping("createFolw")
	public void createFolw(HttpServletRequest request, HttpServletResponse response)throws Exception  {
		Long photoId=RequestUtil.getLong(request,"photoId",0L);
		int width = RequestUtil.getInt(request, "width");
		int height = RequestUtil.getInt(request, "height");
		UpPhoto photoInfo = upPhotoService.getById(photoId);
		HttpSession seesion = request.getSession();
		byte[] data = photoInfo.getFileStream();
		if (width != 0 && height != 0) {
			data =upPhotoService.scaleImage(data, width, height);
		}
		response.setContentType("img/jpg");
		response.setCharacterEncoding("utf-8");
		try {
			OutputStream outputStream = response.getOutputStream();
			InputStream in = new ByteArrayInputStream(data);
			int len = 0;
			byte[] buf = new byte[1024];
			while ((len =in.read(buf,0,1024)) != -1) {
				outputStream.write(buf,0,len);
			}
			outputStream.close();
		} catch (IOException e){
			e.printStackTrace();
		}
		}

service

/**
	 * 調整報告圖片大小
	 * @param data
	 * @param width
	 * @param height
	 * @return
	 * @throws IOException
	 */
	@Override
	public  byte[] scaleImage(byte[] data, int width, int height) throws IOException {
		BufferedImage buffered_oldImage = ImageIO.read(new ByteArrayInputStream(data));
		int imageOldWidth = buffered_oldImage.getWidth();
		int imageOldHeight = buffered_oldImage.getHeight();
		double scale_x = (double) width / imageOldWidth;
		double scale_y = (double) height / imageOldHeight;
		double scale_xy = Math.min(scale_x, scale_y);
		int imageNewWidth = (int) (imageOldWidth * scale_xy);
		int imageNewHeight = (int) (imageOldHeight * scale_xy);
		BufferedImage buffered_newImage = new BufferedImage(imageNewWidth, imageNewHeight, BufferedImage.TYPE_INT_RGB);
		buffered_newImage.getGraphics().drawImage(buffered_oldImage.getScaledInstance(imageNewWidth, imageNewHeight, BufferedImage.SCALE_SMOOTH), 0, 0, null);
		buffered_newImage.getGraphics().dispose();
		ByteArrayOutputStream outPutStream = new ByteArrayOutputStream();
		ImageIO.write(buffered_newImage, "jpeg", outPutStream);
		return outPutStream.toByteArray();
	}