POI 操作Excel，创建下拉框

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");
 }
}

 转自：http://ttaale.iteye.com/blog/836306