Question

第一个单元格是1,2,3,4的下拉列表，而预期的第二个单元格是一个大于第一个单元格的值且小于
的数字的下拉列表。或等于4。

我从Dependent Drop Down Lists in DataValidation得到了一些直觉，如下所示：

  CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 1, 1);
  DataValidationConstraint dvConstraint = 
  dvHelper.createFormulaListConstraint("INDIRECT(UPPER($A$1))");
  DataValidation validation =dvHelper.createValidation(dvConstraint, addressList);
  sheet.addValidationData(validation);

此技巧的关键部分是在dvHelper.createFormulaListConstraint("INDIRECT(UPPER($A$1))")

处明确给出列表公式

如果我对列表公式进行如下硬编码也可以： dvHelper.createFormulaListConstraint("$A$1:$A$4")

，但是在动态创建列表公式时不起作用 CONCATENATE(ADDRESS($B$1,1), ":$A$4")

和CONCATENATE都不直接 CONCATENATE("$A$1", ":$A$4")

Answer 1

我建议使用一个隐藏工作表来存储列表约束的列表值。然后将使用范围命名为数据验证中的列表约束。

然后，其中一个命名范围可以包含INDEX公式，该公式将从使用该名称的单元格左侧单元格中已选择的值中获取一部分列表值。

示例：

import java.io.FileOutputStream;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.apache.poi.ss.util.*;

class CreateExcelDependentDataValidationLists {

 public static void main(String[] args) throws Exception{

   Workbook workbook = new XSSFWorkbook();  

   //hidden sheet for list values
   Sheet sheet = workbook.createSheet("ListSheet");
   sheet.createRow(0).createCell(0).setCellValue("SourceList");
   int r = 1;
   for (int i = 1; i < 5; i++) {
    sheet.createRow(r++).createCell(0).setCellValue(i);
   }
   //unselect that sheet because we will hide it later
   sheet.setSelected(false);

   //visible data sheet
   sheet = workbook.createSheet("Sheet1");

   //names for the list constraints
   Name namedCell = workbook.createName();
   namedCell.setNameName("List1To4");
   String reference = "ListSheet!$A$2:$A$5"; //List 1 to 4
   namedCell.setRefersToFormula(reference);

   namedCell = workbook.createName();
   namedCell.setNameName("ListLeftCellTo4");
   reference = "INDEX(List1To4,INDEX(Sheet1!$1:$1000,ROW(),COLUMN()-1)):INDEX(List1To4,4)"; //List n to 4
                //List1To4Position=ThisRow.ThisColumn-1 : List1To4LastPosition
   namedCell.setRefersToFormula(reference);

   sheet.createRow(0).createCell(0).setCellValue("1 to 4");
   sheet.getRow(0).createCell(1).setCellValue("n to 4");

   sheet.setActiveCell(new CellAddress("A2"));

   sheet.autoSizeColumn(0);
   sheet.autoSizeColumn(1);

   //data validations
   DataValidationHelper dvHelper = sheet.getDataValidationHelper();
   DataValidationConstraint dvConstraint = dvHelper.createFormulaListConstraint("List1To4");
   CellRangeAddressList addressList = new CellRangeAddressList(1, 1, 0, 0);            
   DataValidation validation = dvHelper.createValidation(dvConstraint, addressList);

   sheet.addValidationData(validation);

   dvConstraint = dvHelper.createFormulaListConstraint("ListLeftCellTo4");
   addressList = new CellRangeAddressList(1, 1, 1, 1);            
   validation = dvHelper.createValidation(dvConstraint, addressList);

   sheet.addValidationData(validation);

   //hide the ListSheet
   workbook.setSheetHidden(0, true);
   //set Sheet1 active
   workbook.setActiveSheet(1);

   FileOutputStream out = new FileOutputStream("CreateExcelDependentDataValidationLists.xlsx");
   workbook.write(out);
   workbook.close();
   out.close();

 }
}

是否可以纯粹使用poi excel创建一个依赖下拉列表

1 个答案: