我想要一个带有以下条目的ComboBox:


  {“ 0,5”,“ 1”,“ 1,5”,“ 2”,“ 2,5”}


我使用DataValidation:

    DataValidation dataValidation = null;
    DataValidationConstraint constraint = null;
    DataValidationHelper validationHelper = null;

    validationHelper = new XSSFDataValidationHelper(sheet);
    CellRangeAddressList addressList = new  CellRangeAddressList(row, row, col, col);
    constraint = validationHelper.createExplicitListConstraint(list);
    dataValidation = validationHelper.createValidation(constraint, addressList);
    dataValidation.setSuppressDropDownArrow(true);
    sheet.addValidationData(dataValidation);


该列表具有以下结构:


  list = new String [] {“ 0,5”,“ 1”,“ 1,5”,“ 2”,“ 2,5”}


但是在生成excel文件后,下拉列表中还有其他内容。


  0、5、1、1、5


这是为什么?

如果我使用点符号(0.5,1,1.5),则下一个问题是,当我从ComboBox中选择时,excel会自动将其格式化为日期,例如1.5-> 01。

最佳答案

从您的描述看来,在您的Excel中,十进制分隔符是您当前语言环境设置的逗号。因此,{"0,5", "1", "1,5", "2", "2,5"}中的此逗号与列表约束公式中用作列表定界符的逗号冲突。这是因为此列表约束公式将为<formula1>"0,5,1,1,5,2,2,5"</formula1>

当使用{"0.5", "1", "1.5", "2", "2.5"}时,列表约束公式将为<formula1>"0.5,1,1.5,2,2.5"</formula1>。但是现在,此公式中的点与您的区域设置冲突,在逗号中将逗号作为小数点分隔符,将点用作日期文字的分隔符。

这是一个众所周知的Excel问题。当前的Excel版本通过使用另一种存储列表约束的方法来解决此问题:<x12ac:list>"0,5",1,"1,5",2,"2,5"</x12ac:list>而不是:<formula1>"0,5,1,1,5,2,2,5"</formula1>。但是apache poi不支持此功能。

作为一种解决方法,我建议使用隐藏工作表存储列表项。

例:

import java.io.*;

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

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

class CreateExcelDataValidationListName {

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

   Workbook workbook = new XSSFWorkbook();

   //create sheet for storing the list items:
   Sheet sheet = workbook.createSheet("ListSheet");
   sheet.createRow(0).createCell(0).setCellValue("SourceList");
   int r = 1;
   for (double d = 0.5; d < 3; d+=0.5) {
    sheet.createRow(r++).createCell(0).setCellValue(d);
   }
   //unselect that sheet because we will hide it later
   sheet.setSelected(false);
   //create a named range for the list contraint
   Name namedCell = workbook.createName();
   namedCell.setNameName("SourceList");
   String reference = "ListSheet!$A$2:$A$5";
   namedCell.setRefersToFormula(reference);

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

   sheet.createRow(0).createCell(0).setCellValue("Take the ListItems from B1:");
   sheet.setActiveCell(new CellAddress("B1"));

   sheet.autoSizeColumn(0);

   //create the data validation
   DataValidationHelper dvHelper = sheet.getDataValidationHelper();
   DataValidationConstraint dvConstraint = dvHelper.createFormulaListConstraint("SourceList");
   CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 1, 1);
   DataValidation 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("CreateExcelDataValidationList.xlsx");
   workbook.write(out);
   out.close();
   workbook.close();

 }
}

关于java - ComboBox中的Apache POI双值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/45108735/

10-09 03:59