java POI 利用隐藏sheet实现导出下拉数据太多为空

java POI  利用隐藏sheet实现导出下拉数据太多为空:

1.创建隐藏sheet

       
       // 创建隐藏sheet
       List<String> phaseNameList = getPhaseNames(); if (CollectionUtils.isNotEmpty(phaseNameList)) { wb.createSheet("销售阶段"); wb.setSheetHidden(wb.getSheetIndex(wb.getSheet("销售阶段")), true); Sheet sheet = wb.getSheet("销售阶段"); sheet.createRow(0);//sheet.getLastRowNum无法区分 有一行和没有 所以这里先建一行 String colName = "A"; int colNum = Integer.valueOf(colName.charAt(0)) - 65; Row row; //创建数据行 sheet.setColumnWidth(colNum, 4000); //设置每列的列宽 for (int j = 0; j < phaseNameList.size(); j++) { if (sheet.getLastRowNum() < j) { row = sheet.createRow(j); //创建数据行 } else { row = sheet.getRow(j); } //设置对应单元格的值 row.createCell(colNum).setCellValue(phaseNameList.get(j)); } }
        
 
2.将隐藏sheet的数据绑定在单元格
                String colName = "A";
                List<String> phaseNames = new ArrayList<>(Arrays.asList(getPhaseNames()));
                int row = CollectionUtils.isEmpty(phaseNames) ? 1 : phaseNames.size();
                String strFormula = "销售阶段!$" + colName + "$1:$" + colName + "$" + row;
                XSSFDataValidationConstraint constraint = new XSSFDataValidationConstraint(DataValidationConstraint.ValidationType.LIST,strFormula);
                // 设置数据有效性加载在哪个单元格上,四个参数分别是:起始行、终止行、起始列、终止列
                CellRangeAddressList regions = new CellRangeAddressList(0, 65535, columnIndex, columnIndex);
                // 数据有效性对象
                DataValidationHelper help = new XSSFDataValidationHelper((XSSFSheet) xssfSheet);
                DataValidation validation = help.createValidation(constraint, regions);
                xssfSheet.addValidationData(validation);  

 

 
posted @ 2021-03-05 09:08  二次元的程序猿  阅读(1340)  评论(0编辑  收藏  举报