java使用ApachePOI将列标签插入透视表？

Question

我已经使用ApachePOI3.11创建了一个透视表。像这样：

FileInputStream file = new FileInputStream(new File(path+fname));

XSSFWorkbook workbook = new  XSSFWorkbook(file);

XSSFSheet sheet = workbook.getSheetAt(0);
//area of pivot data
AreaReference a=new AreaReference("A1:J4");

CellReference b=new CellReference("N5");    
XSSFPivotTable pivotTable = sheet.createPivotTable(a,b);

//insert row
pivotTable.addRowLabel(3);
pivotTable.addRowLabel(6);

//insert column
pivotTable.addColumnLabel(DataConsolidateFunction.COUNT, 5);

//export
FileOutputStream output_file = 
   new FileOutputStream(new File(path+"POI_XLS_Pivot_Example.xlsx")); 
workbook.write(output_file);//write excel document to output stream
output_file.close(); //close the file

生成报告后，它正确地显示了行。但它不显示列标签：

我希望在透视表中显示列标签，如下所示：

_{（来源：pivot-table.com）}

有人知道这个问题的解决办法吗

谢谢

Answer 1

以下方法（XSSFPivotTable.addRowLabel的稍微修改版本）添加了一个“普通”数据透视列标签：

public static void addColLabel(XSSFPivotTable pivotTable, int columnIndex) {
    AreaReference pivotArea = new AreaReference(pivotTable.getPivotCacheDefinition().getCTPivotCacheDefinition()
            .getCacheSource().getWorksheetSource().getRef());
    int lastRowIndex = pivotArea.getLastCell().getRow() - pivotArea.getFirstCell().getRow();
    int lastColIndex = pivotArea.getLastCell().getCol() - pivotArea.getFirstCell().getCol();

    if (columnIndex > lastColIndex) {
        throw new IndexOutOfBoundsException();
    }
    CTPivotFields pivotFields = pivotTable.getCTPivotTableDefinition().getPivotFields();

    CTPivotField pivotField = CTPivotField.Factory.newInstance();
    CTItems items = pivotField.addNewItems();

    pivotField.setAxis(STAxis.AXIS_COL);
    pivotField.setShowAll(false);
    for (int i = 0; i <= lastRowIndex; i++) {
        items.addNewItem().setT(STItemType.DEFAULT);
    }
    items.setCount(items.sizeOfItemArray());
    pivotFields.setPivotFieldArray(columnIndex, pivotField);

    CTColFields rowFields;
    if (pivotTable.getCTPivotTableDefinition().getColFields() != null) {
        rowFields = pivotTable.getCTPivotTableDefinition().getColFields();
    } else {
        rowFields = pivotTable.getCTPivotTableDefinition().addNewColFields();
    }

    rowFields.addNewField().setX(columnIndex);
    rowFields.setCount(rowFields.sizeOfFieldArray());
}

Answer 2

从版本3.12 of POI开始，它就像一个符咒（也有自己的列标签）：

//insert column
pivotTable.addColumnLabel(DataConsolidateFunction.COUNT, 2, "Central");
pivotTable.addColumnLabel(DataConsolidateFunction.COUNT, 3, "East");
pivotTable.addColumnLabel(DataConsolidateFunction.COUNT, 4, "West");
pivotTable.addColumnLabel(DataConsolidateFunction.COUNT, 5, "Grand Total");