在springboot中下载外部pdf手册

Question

我需要下载一份 pdf 手册，该手册与我的应用程序的 jar 位于同一级别，但找不到路径。

我的代码：

@RequestMapping(value = "/scaricaManuale", method = RequestMethod.GET, produces = "application/pdf")
public ResponseEntity<InputStreamResource> download() throws IOException {
     ClassPathResource pdfFile = new ClassPathResource("ManualeUtente.pdf");
     HttpHeaders headers = new HttpHeaders();
     headers.setContentType(MediaType.parseMediaType("application/pdf"));
     headers.add("Access-Control-Allow-Origin", "*");
     headers.add("Access-Control-Allow-Methods", "GET, POST, PUT");
     headers.add("Access-Control-Allow-Headers", "Content-Type");
     headers.add("Content-Disposition", "filename=ManualeUtente");
     headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
     headers.add("Pragma", "no-cache");
     headers.add("Expires", "0");

     headers.setContentLength(pdfFile.contentLength());
     ResponseEntity<InputStreamResource> response = new ResponseEntity<InputStreamResource>(
             new InputStreamResource(pdfFile.getInputStream()), headers, HttpStatus.OK);
     return response;

}

如何添加外部类路径？