读取静态资源图片

  // 图标
                    Resource resource = new ClassPathResource("file/内蒙章.png");
                    InputStream is = resource.getInputStream();
                    byte[] fileByte = toByteArray(is);
                    com.itextpdf.text.Image imageJldx = com.itextpdf.text.Image.getInstance(fileByte);
                    Image image = Image.getInstance("内蒙章.png"); // 替换为图片路径
                    image.setAlignment(Image.ALIGN_CENTER);


	public static byte[] toByteArray(InputStream input) throws IOException {
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		byte[] buffer = new byte[4096];
		int n = 0;
		while (-1 != (n = input.read(buffer))) {
			output.write(buffer, 0, n);
		}
		return output.toByteArray();
	}