poi 动态设定excle单元格格式

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

import https://www.wendangku.net/doc/cb13535219.html,ermodel.DVConstraint;
import https://www.wendangku.net/doc/cb13535219.html,ermodel.HSSFCell;
import https://www.wendangku.net/doc/cb13535219.html,ermodel.HSSFDataValidation;
import https://www.wendangku.net/doc/cb13535219.html,ermodel.HSSFRow;
import https://www.wendangku.net/doc/cb13535219.html,ermodel.HSSFSheet;
import https://www.wendangku.net/doc/cb13535219.html,ermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddressList;

public class TestPOI
{
public static void main(String[] args)
{
String[] list = {"a", "b", "c"};
createListBox(list);
return;
}

public static void createListBox(String[] list)
{
//文件初始化
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("test");
String dateformat = "yyyy-MM-dd";
String s="yyyy-MM-dd HH:mm:ss";

//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);
//在第一行第二个单元格，插入日期


//生成下拉列表
//四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(0, 1001, 0, 0);
// CellRangeAddressList regions = new CellRangeAddressList();
//只对（0，1）单元格有效
CellRangeAddressList regions1 = new CellRangeAddressList(1, 1001, 1, 1);



//生成下拉框内容
DVConstraint constraint = DVConstraint.createExplicitListConstraint(list);

//生成日期
DVConstraint constraint1 = DVConstraint.createDateConstraint(DVConstraint.OperatorType.BETWEEN,
"2009-01-01",
"2009-11-01",
dateformat);

//绑定下拉框和作用区域 .并添加输入内容提示
HSSFDataValidation data_validation = new HSSFDataValidation(regions,
constraint);
data_validation.createPromptBox("tip","select");

//绑定日期和作用区域.并添加输入内容提示
HSSFDataValidation date_validation = new HSSFDataValidation(regions1,
constraint1);
date_validation.createPromptBox("tip","date between 2009-01-01 and 2009-11-01");

//对sheet页生效
sheet.addValidationData(data_validation);
sheet.addValidationData(date_validation);

//写入文件
FileOutputStream fileOut;

try
{
fileOut = new FileOutputStream("c:\\testworkbook.xls");
wb.write(fileOut);
fileOut.close();
}
catch (Exception e)
{
e.printStackTrace();
}

}
}