java写简单Excel 首行是目录 然后前台下载

页面:
<form action="${path}/xxx/xxx.do"  method="get" >
        	表格下载：<input type="submit" value="下载">
    	</form>

@RequestMapping("/download")
	public void download(HttpServletRequest request, HttpServletResponse response, HttpSession session)
			throws Exception {
		ArrayList<String> listTitle = new ArrayList<String>();
		listTitle.add("a");
		listTitle.add("b");
		listTitle.add("c");
		listTitle.add("d");
		listTitle.add("e");
		// 创建表格及其第一行标题栏
		HSSFWorkbook wb = new HSSFWorkbook();
		HSSFSheet sheet = wb.createSheet("sheet1");
		HSSFRow row0 = sheet.createRow(0);
		for (int j = 0; j < 5; j++) {// 5列
			HSSFCell cell = row0.createCell((short) j);
			cell.setCellValue(listTitle.get(j).toString());
		}
		String maker = SystemUtil.getCureenUser(session);
		List<MainfestItem> list = transportService.getlist(maker);
		System.out.println(list.size());
		// 从第二行输入
		for (int i = 1; i <= list.size(); i++) { // 几行
			HSSFRow row = sheet.createRow(i);
			HSSFCell cell0 = row.createCell((short) 0);// 第n+1个
			cell0.setCellValue(list.get(i - 1).getId().toString());
			HSSFCell cell1 = row.createCell((short) 1);
			cell1.setCellValue(list.get(i - 1).getContainerid().toString());
			HSSFCell cell2 = row.createCell((short) 2);
			cell2.setCellValue(list.get(i - 1).getIsocode().toString());
		}
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		wb.write(os);
		byte[] content = os.toByteArray();
		InputStream is = new ByteArrayInputStream(content);
		// 设置response参数，可以打开下载页面
		response.reset();
		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		response.setHeader("Content-Disposition",
				"attachment;filename=" + new String(("box" + ".xls").getBytes(), "iso-8859-1"));
		ServletOutputStream out = response.getOutputStream();
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		try {
			bis = new BufferedInputStream(is);
			bos = new BufferedOutputStream(out);
			byte[] buff = new byte[2048];
			int bytesRead;
			// Simple read/write loop.
			while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
				bos.write(buff, 0, bytesRead);
			}
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			if (bis != null)
				bis.close();
			if (bos != null)
				bos.close();
		}
	}