OptimizingImage.java

String fileType = StringUtils.substringAfterLast(file.getOriginalFilename(), ".");
			
			ImageWriter writer = ImageIO.getImageWritersByFormatName("jpeg").next();
			ImageWriteParam param = writer.getDefaultWriteParam();
			param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
			param.setCompressionQuality(0.70f);
			
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			writer.setOutput(os);
			
			writer.write(null, new IIOImage(bufferedImage, null, null), param);
			
//			ImageIO.write(bufferedImage, fileType, os);
			byte[] imageBytes = os.toByteArray();