文件上传下载(一)下载导入模板

public void downloadExcel(HttpServletRequest request,HttpServletResponse response){
        response.reset();
        response.setContentType("application/x-msdownload; charset=GBK");
        // 导出文件名
        String excelName = "导入模板";
        // 改变编码格式的导出文件名
        String fileName = null;
        try {
            fileName = new String(excelName.getBytes("gb2312"), "ISO-8859-1");
            response.setHeader("Content-Disposition", "attachment; filename="" + fileName + ".xls"");
            // 获取模板路径
            String realPath= this.getClass().getResource("/").getPath().replaceFirst("/", "");
            String templateRealPath = realPath + "/template/导入模板.xls";// 文件放在webapp下template文件夹下
            File excel = new File(templateRealPath);
            FileInputStream is = null;
            is = new FileInputStream(excel);
            HSSFWorkbook wb = new HSSFWorkbook(is);
            HSSFSheet sheet = wb.getSheetAt(0);// 第一页
            HSSFFont font = wb.createFont();
            font.setFontHeightInPoints((short)10);
            font.setFontName("宋体");
            HSSFCellStyle style = wb.createCellStyle();
            wb.write(response.getOutputStream());
            response.getOutputStream().close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
}

// xlsx 就把 .xls 改成.xlsx 并用 XSSFWorkbook 代替 HSSFWorkbook 因为Excel的版本不同 要不然会报错 (后面的 HSSFSheet 什么的也把H换成X)