适用于所有单元格的Apache POI风格

Cell cell = row.createCell(1); cell.setCellValue(rdf.getEffectiveDate()); cell.getCellStyle().setDataFormat(HSSFDataFormat.getBuiltinFormat("d-mmm-yy")); cell = row.createCell(2); cell.setCellValue(rdf.getExpiryDate()); cell.getCellStyle().setDataFormat(HSSFDataFormat.getBuiltinFormat("d-mmm-yy")); row.createCell(3).setCellValue(rdf.getPremium()); row.createCell(4).setCellValue(rdf.getAccountNumber()); row.createCell(5).setCellValue(rdf.getLedgerName()); 

我想在以上两列中应用date格式。 但它正在被应用到所有的细胞。 我怎样才能防止这一点。

Answer 1

正如文档所述，Cell.getCellStyle（）永远不会返回null。

https://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/Cell.html#getCellStyle（）

当单元格没有明确设置为单元格时，它将返回工作簿中所有单元格之间最初共享的默认单元格样式。 然后改变这将显然影响没有明确指定风格的所有单元格。

您需要创build一个新的CellStyle，然后将其分配给相关的单元格。

从POI开发者指南：

https://poi.apache.org/spreadsheet/quick-guide.html#CreateDateCells

 Workbook wb = new HSSFWorkbook(); //Workbook wb = new XSSFWorkbook(); CreationHelper createHelper = wb.getCreationHelper(); Sheet sheet = wb.createSheet("new sheet"); // Create a row and put some cells in it. Rows are 0 based. Row row = sheet.createRow(0); // Create a cell and put a date value in it. The first cell is not styled // as a date. Cell cell = row.createCell(0); cell.setCellValue(new Date()); // we style the second cell as a date (and time). It is important to // create a new cell style from the workbook otherwise you can end up // modifying the built in style and effecting not only this cell but other cells. CellStyle cellStyle = wb.createCellStyle(); cellStyle.setDataFormat( createHelper.createDataFormat().getFormat("m/d/yy h:mm")); cell = row.createCell(1); cell.setCellValue(new Date()); cell.setCellStyle(cellStyle); //you can also set date as java.util.Calendar cell = row.createCell(2); cell.setCellValue(Calendar.getInstance()); cell.setCellStyle(cellStyle); // Write the output to a file FileOutputStream fileOut = new FileOutputStream("workbook.xls"); wb.write(fileOut); fileOut.close(); 

Answer 2

尝试创build一个新的单元格样式。 我想你可能会改变默认风格。 所以像这样的东西…

 CellStyle dateTimeCS = wb.createCellStyle(); dateTimeCS.setDataFormat(HSSFDataFormat.getBuiltinFormat("d-mmm-yy")); cell.setCellStyle(dateTimeCS); 

Answer 3

使用RegionUtil将边框应用于一组单元格

https://poi.apache.org/apidocs/org/apache/poi/ss/util/RegionUtil.html

看起来像是在3.15版本中添加的