封装了个方法,根据需要可以改造成异常抛出
/** * 下载、预览文件【导出文件】 */ public static boolean expFile(HttpServletResponse response, String fileName, File file, boolean isDel, boolean isPre) { InputStream fis = null; try { fis = new BufferedInputStream(new FileInputStream(file)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); response.reset(); response.addHeader("Content-Length", String.valueOf(file.length())); response.setHeader("Access-Control-Allow-Origin", "*"); response.setContentType("application/octet-stream; charset=utf-8"); response.setCharacterEncoding("UTF-8"); response.setHeader("Content-Disposition", (isPre ? "inline" : "attachment") + ";filename=" + URLEncoder.encode(fileName, "UTF-8")); OutputStream ops = new BufferedOutputStream(response.getOutputStream()); ops.write(buffer); ops.flush(); ops.close(); } catch (IOException e) { e.printStackTrace(); return false; } finally { try { if (null != fis) fis.close(); if (null != file && file.exists() && isDel) file.delete(); } catch (IOException e) { e.printStackTrace(); } } return true; }