springboot打包成jar后resources读取不到文件

使用读取文件流的形式

private Image loadImage() {
			//加载文件PDF_HEADER_PATH
            try (InputStream input = this.getClass()
                    .getResourceAsStream(ExperimentConstants.PDF_HEADER_PATH);
                 ByteArrayOutputStream output = new ByteArrayOutputStream()){
                byte[] buffer = new byte[4096];
                int n = 0;
                while (-1 != (n = input.read(buffer))) {
                    output.write(buffer, 0, n);
                }
                return Image.getInstance(output.toByteArray());
            } catch (IOException | BadElementException e) {
                System.err.println("未能正确加文件");
                return null;
            }
        }