SpringBoot SpringMVC实现文件下载

   @RequestMapping(value = "/download", method = RequestMethod.GET)    ResponseEntity<InputStreamResource> downloadFile(String log)            throws IOException {        String filePath = "/Users/alilang/logs/" + log        FileSystemResource file = new FileSystemResource(filePath)        HttpHeaders headers = new HttpHeaders()        headers.add("Cache-Control", "no-cache, no-store, must-revalidate");        headers.add("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getFilename()))        headers.add("Pragma", "no-cache")        headers.add("Expires", "0")        return ResponseEntity                .ok()                .headers(headers)                .contentLength(file.contentLength())                .contentType(MediaType.parseMediaType("application/octet-stream"))                .body(new InputStreamResource(file.getInputStream()))    }