easypoi生成带下拉框的excel

1. package com.test;  
2.   
3. import java.io.FileOutputStream;  
4.   
5. import org.apache.poi2.hssf.usermodel.DVConstraint;  
6. import org.apache.poi2.hssf.usermodel.HSSFCell;  
7. import org.apache.poi2.hssf.usermodel.HSSFDataValidation;  
8. import org.apache.poi2.hssf.usermodel.HSSFRow;  
9. import org.apache.poi2.hssf.usermodel.HSSFSheet;  
10. import org.apache.poi2.hssf.usermodel.HSSFWorkbook;  
11. import org.apache.poi2.hssf.util.CellRangeAddressList;  
12.   
13. public class JExcel {  
14.   
15.     public static void main(String[] args) {  
16.         HSSFWorkbook wb = new HSSFWorkbook();  
17.         HSSFSheet sheet = wb.createSheet("new sheet");  
18.         // 在第一行第一个单元格，插入下拉框  
19.         HSSFRow row = sheet.createRow(0);  
20.         HSSFCell cell = row.createCell(0);  
21.         // 普通写入操作  
22.         cell.setCellValue("请选择");// 这是实验  
23.         // 生成下拉列表  
24.         // 只对(0，0)单元格有效  
25.         CellRangeAddressList regions = new CellRangeAddressList(0, 0, 0, 0);  
26.         // 生成下拉框内容  
27.         DVConstraint constraint = DVConstraint.createExplicitListConstraint(new String[] { "2", "3" });  
28.         // 绑定下拉框和作用区域  
29.         HSSFDataValidation data_validation = new HSSFDataValidation(regions,constraint);  
30.         // 对sheet页生效  
31.         sheet.addValidationData(data_validation);  
32.        
33.         try {  
34.             

       response.setContentType("application/vnd.ms-excel");
        String fileName = URLEncoder.encode("模板下载","UTF-8");
        response.setHeader("Content-Disposition","attachment; filename="+ fileName+".xls");
        ServletOutputStream out = response.getOutputStream();
        wb.write(out);
        out.close();

35.         } catch (Exception e) {  
36.             // TODO Auto-generated catch block  
37.             e.printStackTrace();  
38.   
39.         }  
40.         // 结束  
41.         System.out.println("Over");  
42.   
43.     }  
44. }