需求：根据前端传递的id查询数据库中相对于的文件路径，根据相对应路径将文件下载下来
注：下列代码中的注1、注2、注3、注4、注5代表需要更换的内容后可直接使用
@RequestMapping(value = "/download", method = RequestMethod.GET) public ResponseEntity downloadFile(@RequestParam(value="id") Long id) throws Exception { PlywoodInfo f = service.download(id); //注1 if(f==null){ return fail("文件不存在！"); }else{ //f.getPlywoodPath()为数据库中查到的文件路径 eg：D:/test File _file = new File(f.getPlywoodPath()); if(!_file.exists()){ return fail("文件不存在！"); } String startPath = f.getStartPath(); //注2 File startPathFile = new File(startPath); //注3 String finalFileName = URLEncoder.encode( startPathFile.getName() + ".xml","UTF-8"); //注4 FileSystemResource file = new FileSystemResource(f.getPlywoodPath());//注5 HttpHeaders headers = new HttpHeaders(); headers.add("Cache-Control", "no-cache, no-store, must-revalidate"); headers.add("Content-Disposition", String.format("attachment; filename="%s"", finalFileName)); 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())); } } private ResponseEntity fail(String msg){ String errorMsg = ""; InputStream inputStream = null; try { inputStream = new ByteArrayInputStream(errorMsg.getBytes("GBK")); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } InputStreamResource inputStreamResource = new InputStreamResource(inputStream); HttpHeaders headers = new HttpHeaders(); headers.add(HttpHeaders.CONTENT_TYPE,"text/html;charset=UTF-8"); headers.add("Cache-Control", "no-cache, no-store, must-revalidate"); headers.add("Pragma", "no-cache"); headers.add("Expires", "0"); return ResponseEntity .ok() .headers(headers) .contentType(MediaType.TEXT_HTML) .body(inputStreamResource); }
注1：PlywoodInfo f = service.download(id); //这行代表表示根据id查询数据库中的内容
注2，注3和注4是给下载后的文件给一个名字、
如果有疑问可以私密，有不足地方可以说出来，谢谢！