POI导出时，将指定的列设置为下拉列表

1         ComboxList = new String[]{"是","否"};
2         HSSFWorkbook wbook = new HSSFWorkbook();
3         CellRangeAddressList regions = new CellRangeAddressList(4,5656,colNum,colNum);
4         DVConstraint constraint = DVConstraint.createExplicitListConstraint(ComboxList);
5         HSSFDataValidation data_validation = new HSSFDataValidation(regions,constraint);
6         wbook.getSheetAt(0).addValidationData(data_validation);