使用spring实现文件的下载

1.获取文件的目录

2.将文件设置为强制下载不打开

3.获取输入流和输出流实现文件的下载

@RequestMapping(params = "downExcelTemplate")/** * 模板文件下载 * @Description:  * @param fileName * @param request * @param response * @return */public void downExcelTemplate(HttpServletRequest request,HttpServletResponse response) {// 生成excel模板String pathname = CreateCallBack.createExcel();String fileName = "callBack.xls";File file = new File(pathname);if (file.exists()) {response.setContentType("application/force-download");// 设置强制下载不打开response.addHeader("Content-Disposition", "attachment;fileName="+ fileName);// 设置文件名byte[] buffer = new byte[1024];FileInputStream fis = null;BufferedInputStream bis = null;try {fis = new FileInputStream(file);bis = new BufferedInputStream(fis);OutputStream os = response.getOutputStream();int i = bis.read(buffer);while (i != -1) {os.write(buffer, 0, i);i = bis.read(buffer);}} catch (Exception e) {e.printStackTrace();} finally {if (bis != null) {try {bis.close();} catch (IOException e) {e.printStackTrace();} finally {bis = null;}}if (fis != null) {try {fis.close();} catch (IOException e) {e.printStackTrace();} finally {fis = null;}}}}}