Excelダウンロードでグラフ・罫線が表示されない

	public void execute(

		HttpServletRequest request,

		HttpServletResponse response)

		throws Exception {

			



			File file = new File(excelPath+"graph.xls");

			String filename = "attachment;filename=" + file.getName();

			response.setHeader("Content-Disposition", filename);

			response.setContentType("application/vnd.ms-excel");

			OutputStream out = null;

			FileInputStream fin = null;

			try {

				fin = new FileInputStream(file);

				BufferedInputStream bin = new BufferedInputStream(fin);

					

					

				out = response.getOutputStream();

				BufferedOutputStream bout = new BufferedOutputStream(out);

					

				int b;

				while ((b = bin.read()) != -1) {

					bout.write(b);

				}

					

					

			} catch (IOException e) {

					throw e;

			} finally {

				if (fin != null) {

					fin.close();

				}

				if (out != null) {

					out.flush();

					out.close();

				}

			}

	}

　} finally {
　　if (fin != null) {
　　　fin.close();
　　}
　　if (out != null) {
　　　out.flush();
　　　out.close();
　　}
　}