easypoi生成Excel下拉框选项

最新推荐文章于 2024-01-15 16:19:59 发布

原创最新推荐文章于 2024-01-15 16:19:59 发布 · 2.3k 阅读

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本文详细介绍了如何利用easypoi库在Excel中生成下拉列表选项，包括设置数据源、定义数据验证规则，以及如何在Java代码中实现这一过程，帮助开发者提高数据输入的规范性和一致性。


    /**
     * excel 导出
     * @param list
     * @param pojoClass
     * @param fileName
     * @param response
     * @param exportParams
     * @param selectList
     * @throws IOException
     */
    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams,List<String> selectList) throws IOException {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        selectList(workbook, 0, 0, new String[]{"北京","上海","天津","广州","深圳"});
        downLoadExcel(fileName, response, workbook);
    }

    /**
     * 下载
     *
     * @param fileName 文件名称
     * @param response
     * @param workbook excel数据
     */
    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Access-Control-Expose-Headers","Content-Disposition");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + "." + ExcelTypeEnum.XLSX.getValue(), "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }


    /**
     * 生成下拉列表
     * 
     * @param workbook
     * @param firstCol
     * @param lastCol
     * @param datas
     */
    public static void selectList(Workbook workbook,int firstCol,int lastCol,String[] datas ){
        Sheet sheet = workbook.getSheetAt(0);
        //生成下拉列表
        CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(2, 90000, firstCol, lastCol);
        //生成下拉框内容
        DataValidationHelper dvHelper = sheet.getDataValidationHelper();
        DataValidationConstraint dvConstraint = dvHelper.createExplicitListConstraint(datas);
        DataValidation validation = dvHelper.createValidation(dvConstraint, cellRangeAddressList);
        //设置错误信息提示
        validation.setShowErrorBox(true);
        //对sheet页生效
        sheet.addValidationData(validation);
    }