创建Java Apache POI折线图，其中日期显示在水平X轴上

Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("折线图");

// 添加日期数据到第一行
Row dateRow = sheet.createRow(0);
dateRow.createCell(0).setCellValue("日期");
dateRow.createCell(1).setCellValue("2021-01-01");
dateRow.createCell(2).setCellValue("2021-01-02");
// ...

// 添加数值数据到第二行
Row valueRow = sheet.createRow(1);
valueRow.createCell(0).setCellValue("数值");
valueRow.createCell(1).setCellValue(10);
valueRow.createCell(2).setCellValue(20);
// ...

Drawing<?> drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 4, 1, 10, 15);

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

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

ChartAxis bottomAxis = chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);
ChartAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);

ChartDataSource<Number> x = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 1, 1, numberOfColumns - 1));
ChartDataSource<Number> y = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(2, 2, 1, numberOfColumns - 1));

LineChartSeries series = data.addSeries(x, y);
series.setTitle(sheet.getRow(1).getCell(0).getStringCellValue());

chart.plot(data, bottomAxis, leftAxis);