下载服务器resources文件

  @GetMapping("download")
    @ApiOperation(value = "下载 标准库板块excel")
    public void download(HttpServletRequest request, HttpServletResponse response) {
        OutputStream os = null;
        InputStream inputStream = null;
        BufferedInputStream bis = null;
        try {
            ResourceLoader resourceLoader = new DefaultResourceLoader();
            String  fileTemplateName = "标准库板块.xlsx";
            inputStream = resourceLoader.getResource("classpath:/templatefile/"+fileTemplateName).getInputStream();
            bis = new BufferedInputStream(inputStream);
            os = response.getOutputStream();
            //通过文件名称获取MIME类型
            String framename = filenameEncoding(fileTemplateName, request);
            String contentType = request.getServletContext().getMimeType(fileTemplateName);
            String contentDisposition = "attachment;filename=" + framename;
            response.setHeader("Content-Type", contentType);
            response.setHeader("Content-Disposition", contentDisposition);
            byte[] buffer = new byte[1024];
            int i = bis.read(buffer);
            while (i != -1) {
                os.write(buffer, 0, i);
                i = bis.read(buffer);
            }
        } catch (Exception ue) {
            throw new CommonException("下载 标准库板块失败！", ue);
        }finally {
            try {
                os.close();
                inputStream.close();
                bis.close();
            }catch (Exception ue){
                throw new CommonException("下载 标准库板块失败！", ue);
            }
        }
    }

    private String filenameEncoding(String filename, HttpServletRequest request){
        try {
            String agent = request.getHeader("User-Agent"); //获取浏览器
            if (agent.contains("Firefox")) {
                filename = "=?" + "UTF-8" + "?B?"
                        + Base64.encodeBase64String(filename.getBytes("UTF-8"))
                        + "?=";
            } else if(agent.contains("MSIE")) {
                filename = URLEncoder.encode(filename, "UTF-8");
            } else {
                filename = URLEncoder.encode(filename, "UTF-8");
            }
        } catch (Exception e) {
            throw new CommonException("文件名转换异常！", e);
        }
        return filename;
    }