javaweb reponse 写出文件

Map map = getSearchValue();
			File excelFile = orderService.getexportexcel(id,map);
			InputStream is = null;
			OutputStream os = null;
			BufferedInputStream bis = null;
			BufferedOutputStream bos = null;
			 //以流的形式输出文件
			try {
				if (excelFile.exists()) {
					String fileName = "订单.xls";

					is = new FileInputStream(excelFile);
					HttpServletResponse response = ServletActionContext
							.getResponse();
					os = response.getOutputStream();
					bis = new BufferedInputStream(is);
					bos = new BufferedOutputStream(os);

					fileName = java.net.URLEncoder.encode(fileName, "UTF-8");// 处理中文文件名的问题
//					fileName = new String(fileName.getBytes("UTF-8"), "GBK");// 处理中文文件名的问题

					response.reset();
					response.setCharacterEncoding("UTF-8");
					response.setContentType("application/ vnd.ms-excel");// 不同类型的文件对应不同的MIME类型

					response.setHeader("Content-Disposition",
							"attachment; filename=" + fileName);
					int bytesRead = 0;
					byte[] buffer = new byte[1024];
					while ((bytesRead = bis.read(buffer)) != -1) {
						bos.write(buffer, 0, bytesRead);// 将文件发送到客户端
					}
					bos.flush();
				}
			} catch (Exception e) {
				logger.error(e.getMessage(), e);
			} finally{
				IOUtils.closeQuietly(bis);
				IOUtils.closeQuietly(bos);
				IOUtils.closeQuietly(is);
				IOUtils.closeQuietly(os);
			}