java输出流实现文件下载

//导出Excel

            try {

                HSSFWorkbook wb = carService.export(list);  //调用service方法~!

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

                response.setHeader("Content-disposition", "attachment;filename=carsList.xls");  

                OutputStream ouputStream = response.getOutputStream();  

                wb.write(ouputStream);  

                ouputStream.flush();  

                ouputStream.close(); 

            } catch (Exception e) {    

                logger.error("车辆信息导出excel错误:", e);

            }  

            return null;



//导出zip文件

//response.reset();  

                        response.setCharacterEncoding("utf-8");

                        response.setContentType("application/octet-stream;charset=UTF-8");

                        response.setHeader("Content-Disposition", "attachment; filename=\"" + zipName + "\"");   

                        InputStream is = new FileInputStream(zipFile);     //是文件而不是文件名。

                        FileCopyUtils.copy(is, response.getOutputStream());//将文件写到输出流中

                        return null;