导出Excel工具类

导出Excel的工具方法，主要是生成excel文件：

    public static void writeFailureReasonToExcelFile(List<FailureReasonResponseEntity> queryAllFailureReasonCountList,String path){
        try {
            //创建一个工作簿 excel文件
            XSSFWorkbook workbook = new XSSFWorkbook();
            //创建一个标签页
            XSSFSheet sheet = workbook.createSheet("失败原因查询数据");
            //创建标题行
            XSSFRow xSSFRow = sheet.createRow(0);
            xSSFRow.createCell(0).setCellValue("波束号");
            xSSFRow.createCell(1).setCellValue("单位");
            xSSFRow.createCell(2).setCellValue("主叫号码");
            xSSFRow.createCell(3).setCellValue("被叫号码");
            xSSFRow.createCell(4).setCellValue("失败原因");
            //将数据写入Excel表格中
            for (FailureReasonResponseEntity failureReasonResponseEntity : queryAllFailureReasonCountList) {
                XSSFRow dataRow = sheet.createRow(sheet.getLastRowNum()+1);
                dataRow.createCell(0).setCellValue(failureReasonResponseEntity.getBeamId());
                dataRow.createCell(1).setCellValue(failureReasonResponseEntity.getLevelUnit());
                dataRow.createCell(2).setCellValue(failureReasonResponseEntity.getCallerResponseNumber());
                dataRow.createCell(3).setCellValue(failureReasonResponseEntity.getCalleeResponseNumber());
                dataRow.createCell(4).setCellValue(failureReasonResponseEntity.getReasonResponseValue());
            }
            FileOutputStream os = new FileOutputStream(path);
            workbook.write(os);

            //关闭流
            os.close();
            workbook.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

controller层的处理方法：

    @RequestMapping("/getOptionQueryData")
    @RequiresPermissions("sys:failureReason:getOptionQueryData")
    public void getOptionQueryData(HttpServletResponse response) throws Exception {
        if(queryAllFailureReasonCountList.size()!=0){
            //将查询出来的数据写到Excel文件中
            //输出流进行文件下载
            String fileName = "FailureReasonCount_"+sdf.format(new Date())+".xlsx";
            File file = new File(fileName);
            //将数据写入Excel中
            ExcelUtils.writeFailureReasonToExcelFile(queryAllFailureReasonCountList,fileName);
            // 以流的形式下载文件。
            FileInputStream fileInputStream = new FileInputStream(file);
            String encodedfileName = new String(fileName.getBytes(), "UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename=\"" + encodedfileName + "\"");
            IOUtils.copy(fileInputStream, response.getOutputStream());
            fileInputStream.close();
        }
    }

通过上面的代码就能实现导出到excel文件中

原文地址：https://www.cnblogs.com/OneStriver/p/9442322.html