java源代码:POI 操作Excel,创建下拉框

本文介绍如何使用Java的Apache POI库为Excel工作表创建包含指定选项的下拉列表。通过示例代码展示了从创建Excel工作簿到设置单元格数据验证的全过程。

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package poiexcel;


import java.io.FileOutputStream;
import java.util.Date;

import org.apache.poi.hssf.usermodel.DVConstraint;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddressList;

public class POI
{
 public static void main(String [] args)
 {
  String [] list={"东软","华信","SAP","海辉"};
  new POI().createListBox(list);
  return;
 }
 public void createListBox (String [] list)
 {
  //文件初始化
  HSSFWorkbook wb = new HSSFWorkbook();
     HSSFSheet sheet = wb.createSheet("new sheet");
    
     //在第一行第一个单元格,插入下拉框
     HSSFRow row = sheet.createRow(0);
     HSSFCell cell = row.createCell(0);
    
     //普通写入操作
     cell.setCellValue("请选择");//这是实验

     //生成下拉列表
    
     //只对(0,0)单元格有效
     CellRangeAddressList regions = new CellRangeAddressList(0,0,0,0);
    
     //生成下拉框内容
     DVConstraint constraint = DVConstraint.createExplicitListConstraint(list);
    
     //绑定下拉框和作用区域
     HSSFDataValidation data_validation = new HSSFDataValidation(regions,constraint); 
    
     //对sheet页生效
     sheet.addValidationData(data_validation);

     //写入文件
     FileOutputStream fileOut;
  try {
   fileOut = new FileOutputStream("workbook.xls");
   wb.write(fileOut);
   fileOut.close();
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  //结束
  System.out.println("Over");
 }
}

Excel 三级 联动 下拉框 宏代码 实例 代码注释 先在第一个下拉框加入一个valiation, 内容是 =$A$2:$A$5 Private Sub Worksheet_Change(ByVal Target As Range) ' Call back function which defined within according worksheet Dim i As Integer Dim tempStr As String Dim firstDrawBoxRowCount As Integer Dim firstDrawBoxColumn As Integer firstDrawBoxRowCount = 4 'Define the row number of first draw box firstDrawBoxColumn = 1 'Define the column number of ifrst draw box Dim secondDrawBoxRowCount As Integer Dim secondDrawBoxColumn As Integer secondDrawBoxRowCount = 33 'Define the row number of second draw box secondDrawBoxColumn = 4 'Define the column number of second draw box If Target.Column = 1 Then 'This defines the first column of draw box list, you can also define the row number of draw box list Cells(Target.Row, Target.Column + 1) = "" ' Do the clean first Cells(Target.Row, Target.Column + 1).Validation.Delete Cells(Target.Row, Target.Column + 2) = "" Cells(Target.Row, Target.Column + 2).Validation.Delete For i = 2 To firstDrawBoxRowCount + 1 'Enter the cycle to find out the content for column 2 If Trim(Cells(Target.Row, Target.Column)) = Trim(Cells(i, firstDrawBoxColumn)) Then tempStr = Trim(Cells(i, firstDrawBoxColumn + 1)) 'Find out the options for second draw box, it is seperated by , Cells(Target.Row, Target.Column + 1).Select ' Fill the validation to second draw box With Selection.Validation .Delete .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _ xlBetween, Formula1:=tempStr .IgnoreBlank = True .InCellDropdown = True .InputTitle = "" .ErrorTitle = "" .InputMessage = "" .ErrorMessage = "" .IMEMode = xlIMEModeNoControl .ShowInput = True .ShowError = True
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