Cisco 3550交换机配置DHCP服务器实例

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(0,50,0,0);

//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("C:\\workbook.xls");
wb.write(fileOut);
fileOut.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//结束
System.out.println("Over");
}
}