Apache POI 将系列名称添加到 LineChart 中

我正在 Excel 文档中使用 Apache POI 创建折线图。据我设法实现的目标如下图所示：

我使用 Apache svn 中的示例编写了代码，所以我当前的方法如下所示：

Drawing drawing = question.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 4, 8, 14, 18);

Chart chart = drawing.createChart(anchor);
ChartLegend legend = chart.getOrCreateLegend();
legend.setPosition(LegendPosition.TOP_RIGHT);

LineChartData data = chart.getChartDataFactory().createLineChartData();

ChartAxis bottomAxis = chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);
bottomAxis.setCrosses(AxisCrosses.AUTO_ZERO);
ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);
leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

List<ReportQuestionModel> questionModels = groupModel.getQuestionModels();
for (ReportQuestionModel questionModel : questionModels) {

    List<ReportOptionModel> optionModels = questionModel.getOptionModels();
    for (ReportOptionModel optionModel : optionModels) {
        rowNum++;

        XSSFRow optionRow = question.createRow(rowNum);

        XSSFCell optionsCell = optionRow.createCell(0);
        optionsCell.setCellValue(optionModel.getAnswerText());

        long count = optionModel.getCount();
        totalResponses += count;

        XSSFCell optionsCountCell = optionRow.createCell(1);
        optionsCountCell.setCellValue(count);

        XSSFCell optionsPercentageCell = optionRow.createCell(2);
        optionsPercentageCell.setCellValue(optionModel.getPercentage());
    }
}

ChartDataSource<Number> xs = DataSources.fromNumericCellRange(question, new CellRangeAddress(8, 8, 0, 1));
for (int i = 9; i <= rowNum; i ++) {
    ChartDataSource<Number> ys = DataSources.fromNumericCellRange(question, new CellRangeAddress(i, i, 0, 1));
    data.addSerie(xs, ys);
}
chart.plot(data, bottomAxis, leftAxis);

我找不到的是如何获得默认值"Series 1", "Series 2", ..., "Series n"将从列中获取的名称作为我的值，在本例中来自：“答案选项”。而且当前的API中似乎没有任何方法来指定系列名称。

有人可以帮我吗？

这非常简单，只是不使用：

data.addSeries(xs, ys);

我必须使用：

LineChartSeries chartSeries = data.addSeries(xs, ys);
chartSeries.setTitle("My Title");

没有看使用的APIdata.addSeries(xs, ys);返回单个LineChartSeries我可以在其上设置标题的对象。