Java实现导出Excel表格

case代码

/**
     * 使用POI写入Excel文件，提供下载
     * @throws IOException 
     */
    @RequestMapping(value = "/downloadTempate2")
    public void downloadTempate2(HttpServletResponse response,HttpServletRequest request) throws IOException {
        List<Device> list = deviceService.findAll();
        // 在内存中创建一个Excel文件，通过输出流写到客户端提供下载
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 创建一个sheet页
        HSSFSheet sheet = workbook.createSheet("设备数据");
        // 创建标题行
        HSSFRow headRow = sheet.createRow(0);
        headRow.createCell(0).setCellValue("ID");
        headRow.createCell(1).setCellValue("设备名称");
        headRow.createCell(2).setCellValue("型号");
        headRow.createCell(3).setCellValue("购买日期");
        headRow.createCell(4).setCellValue("生产厂家");
        headRow.createCell(5).setCellValue("数量");
        headRow.createCell(6).setCellValue("单价");

        for (Device device : list) {
            HSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1);
            dataRow.createCell(0).setCellValue(device.getId());
            dataRow.createCell(1).setCellValue(device.getDeviceName());
            dataRow.createCell(2).setCellValue(device.getDeviceSize());
            dataRow.createCell(3).setCellValue(device.getDeviceBuydate());
            dataRow.createCell(4).setCellValue(device.getDeviceFactory());
            dataRow.createCell(5).setCellValue(device.getDeviceNum());
            dataRow.createCell(6).setCellValue(device.getDevicePay());
         }

        String filename = "设备数据.xls";
        String agent = request.getHeader("User-Agent");
        filename = FileUtils.encodeDownloadFilename(filename, agent);
        //一个流两个头
        ServletOutputStream out = response.getOutputStream();
        response.addHeader("Content-Disposition", "attachment; filename="+filename);
        response.setContentType("application/octet-stream;charset=UTF-8");

        workbook.write(out);
     }