springboot下載文件(使用流)

1.FileServiceImpl.java

/** * 下載文件 * * @param address * @param response * @throws IOException */ @Override public void downloadFile(String address, HttpServletResponse response) throws IOException { if (address.contains("%")) { try { address = URLDecoder.decode(address, "UTF-8"); } catch (UnsupportedEncodingException e) { throw new CyException("文件路徑有誤"); } } ServletOutputStream out = null; FileInputStream in = null; try { in = new FileInputStream(new File(address)); String[] dir = address.split("/"); String fileName = dir[dir.length - 1]; // 設置響應類型為html，編碼為utf-8，處理相應頁面文本顯示的亂碼 response.setContentType("application/octet-stream"); // 設置文件頭：最后一個參數是設置下載文件名 response.setHeader("Content-disposition", "attachment;filename=" + fileName); out = response.getOutputStream(); // 讀取文件流 int len = 0; byte[] buffer = new byte[1024 * 10]; while ((len = in.read(buffer)) != -1) { out.write(buffer, 0, len); } out.flush(); } catch (FileNotFoundException e) { throw new CyException("文件路徑有誤"); } finally { response.flushBuffer(); try { out.close(); in.close(); } catch (NullPointerException e) { throw new CyException("responseFileStream stream close() error:NullPointerException" + e.toString()); } catch (Exception e) { throw new CyException("responseFileStream stream close() error:" + e.toString()); } } } 

2.FileController.java

@RequestMapping(value = "/downloadFile", method = RequestMethod.GET) @ResponseBody @Validated public void downloadFile(@NotBlank @RequestParam(value = "address") String address, HttpServletResponse response) throws IOException { fileService.downloadFile(address, response); }