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easypoi添加下拉预选值

原因是使用easypoi自带的下拉预选值无效，并且还带来了版本冲突的问题，所以只能自己来解决， easypoi的使用请参考： http://doc.wupaas.com/docs/easypoi/easypoi-1c0u9dt0lqnpl

这里是说明使用easypoi生成的Workbook之后如何给单元格设置下拉预选值，但是也有缺点，就是前提必须要知道设置下拉预选值单元格的范围，也就是需要指定范围，行列的范围，原理其实是创建sheet页，这是poi的写法，也就是一整个模板，代码如下：

// poi导出，生成Workbook 
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("生活老师导入","Sheet0", ExcelType.XSSF), ExportDormDTO.class, list);
// 设置下拉预选值
String[] dropDownValue = new String[]{"A", "B", "C", "D"};
String  dropDownSheetName= "生活评价";
XSSFDataValidationHelper dropDownValidationHelper = createXSSFDataValidationHelper(workbook, dropDownSheetName, dropDownValue);
DataValidationConstraint dropDOwnValidationConstraint = dropDownValidationHelper.createFormulaListConstraint(dropDownSheetName + "!$A$1:$A$" + dropDownValue.length);
Sheet firstSheet = workbook.getSheet("Sheet0");
CellRangeAddressList drowDownValueCoveringRowsAndCloumns = new CellRangeAddressList(2, firstSheet.getLastRowNum(), 5, 9);
XSSFDataValidation dropDownValidation =(XSSFDataValidation)dropDownValidationHelper.createValidation(dropDOwnValidationConstraint, drowDownValueCoveringRowsAndCloumns);
firstSheet.addValidationData(dropDownValidation);
downLoadExcel("生活老师评价导入.xlsx", response, workbook);

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下面是固定写法，是上面代码中使用到的局部方法

// 流导出
private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {
    response.reset();
    response.setContentType("application/x-download");
    response.setHeader("Content-Disposition",
            "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO-8859-1"));
    workbook.write(response.getOutputStream());
}

// 生成预选值的sheet页
private static XSSFDataValidationHelper createXSSFDataValidationHelper(Workbook workbook, String name, String[] strList) {
    Sheet sheet = workbook.createSheet(name);
    // 循环往该sheet中设置添加下拉列表的值
    for (int i = 0; i < strList.length; i++) {
        Row row = sheet.createRow(i);
        Cell cell = row.createCell((int) 0);
        cell.setCellValue(strList[i]);
    }
    workbook.setSheetHidden(workbook.getSheetIndex(name), true);
    XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper((XSSFSheet) workbook.getSheet(name));
    dvHelper.createFormulaListConstraint(name + "!$A$1:$A$" + strList.length);
    return dvHelper;
}

生面是xlsx的文档的添加下拉预选值，至于xls的就不展示，大概一样的道理，有问题的随时联系我。

wx：wz15713598138

qq: 2585700076

原文 https://www.maiyewang.com/archives/101710

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