/**
     *
     * @param filePath 路徑含檔案字尾//檔案完整路徑(包括檔名和副檔名)
     * @param name   下載後的名字
     * @param response
     * @return
     * @throws IOException
     */
    @Override
    public ApiResult getDownLoad(String filePath,String name,HttpServletResponse response) throws IOException
        {
            response.setCharacterEncoding("utf-8");

            String url = URL + filePath;
            CloseableHttpClient httpclient = HttpClients.createDefault();
            HttpGet httpGet = new HttpGet(url);
            response.setContentType("application/octet-stream");
            response.setHeader("name", name);
            response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
            response.setHeader("Pragma", "public");
            response.setDateHeader("Expires", 0);
            response.setHeader("Content-disposition",
             "attachment; filename=\"" + URLEncoder.encode(name, "UTF-8") + "\"");
            CloseableHttpResponse closeableHttpResponse = httpclient.execute(httpGet);
            HttpEntity entity = closeableHttpResponse.getEntity();
            InputStream in = entity.getContent();
            ServletOutputStream out = response.getOutputStream();
            int b = 0;
            byte[] buffer = new byte[512];
            while (b != -1) {
                b = in.read(buffer);
                //4.寫到輸出流(out)中
                out.write(buffer, 0, b);
            }
            in.close();
            out.close();
            out.flush();
            return new ApiResult().success();
        }