java poi excel操作 下拉菜单 及数据有效性

 1 private InputStream updateTemplateStyleHSSF(InputStream inputStream,CsCustCon csCustCon) throws IOException, DAOException{
 2         HSSFWorkbook workbook = new HSSFWorkbook(inputStream);        
 3         HSSFSheet firstSheet=  workbook.getSheetAt(0);
 4         List<String> strList=csConAcceDao.getAcceNameAndNoListByConId(csCustCon);
 5         String[] strs=(String[])strList.toArray(new String[strList.size()]);
 6         
 7         String secondSheetName="合同附件名称和编号";
 8         HSSFSheet secondSheet=  workbook.createSheet(secondSheetName);
 9         if(null!=strs&&strs.length>0){
10             for(int i=0;i<strs.length;i++){
11                  HSSFRow row=secondSheet.createRow(i);
12                 HSSFCell cell= row.createCell(0);
13                 cell.setCellValue(strs[i]);
14             }
15         } 
16         Name name=workbook.createName();
17         name.setNameName(secondSheetName);
18         name.setRefersToFormula(secondSheetName+"!$A$1:$A$"+strs.length);
19         CellRangeAddressList  newStyleRange=new CellRangeAddressList(1,65535,0,0);
20         DVConstraint constraint=DVConstraint.createFormulaListConstraint(secondSheetName);
21         HSSFDataValidation  dataValidation=new HSSFDataValidation(newStyleRange, constraint);
22         dataValidation.setShowPromptBox(true);
23         firstSheet.addValidationData(dataValidation);
24         
25         ByteArrayOutputStream out=new ByteArrayOutputStream();
26         workbook.write(out);
27         byte[] contents=out.toByteArray();
28         InputStream newInputStream= new ByteArrayInputStream(contents);     
29         return newInputStream;
30     }

List<String> strList=csConAcceDao.getAcceNameAndNoListByConId(csCustCon);

 ByteArrayOutputStream out=new ByteArrayOutputStream();
         workbook.write(out);
         byte[] contents=out.toByteArray();
         InputStream newInputStream= new ByteArrayInputStream(contents);     
         return newInputStream;