Apache POI Excel 折线图创建教程：双轴图表绘制

import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellType; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.xddf.usermodel.chart.; import org.apache.poi.xssf.usermodel.;

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date;

public class ExcelChartExample04 {

public static void main(String[] args) {
    try {
        // 读取Excel文件
        FileInputStream fileIn = new FileInputStream("input-1.xlsx");
        XSSFWorkbook workbook = new XSSFWorkbook(fileIn);
        XSSFSheet sheet1 = workbook.getSheet("P1");

        // 创建折线图
        XSSFDrawing drawing = sheet1.createDrawingPatriarch();
        XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 129, 10, 149);
        XSSFChart chart = drawing.createChart(anchor);
        chart.setTitleText("数据折线图");
        chart.setTitleOverlay(false);

        // 设置图例位置
        XDDFChartLegend legend = chart.getOrAddLegend();
        legend.setPosition(LegendPosition.BOTTOM);

        // 设置横坐标轴为日期坐标轴
        XDDFDataSource<?> dateSource = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(11, 85, 1, 1));
        XDDFDateAxis bottomAxis = chart.createDateAxis(AxisPosition.BOTTOM);
        bottomAxis.setMajorTickMark(AxisTickMark.CROSS);
        bottomAxis.setMinorTickMark(AxisTickMark.NONE);
        bottomAxis.setCrosses(AxisCrosses.AUTO_ZERO);
        bottomAxis.setTitle("时间");
        bottomAxis.setTickLabelPosition(AxisTickLabelPosition.NEXT_TO);

        // 设置时间格式
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        for (int i = 0; i < dateSource.getPointCount(); i++) {
            XSSFRow row = sheet1.getRow(i + 11);
            if (row != null) {
                Cell cell = row.getCell(1);
                if (cell != null && cell.getCellType() == CellType.NUMERIC) {
                    Date date = cell.getDateCellValue();
                    String formattedDate = dateFormat.format(date);
                    bottomAxis.setTickLabelPosition(AxisTickLabelPosition.NEXT_TO);
                }
            }
        }

        // 设置左侧坐标轴为温度坐标轴
        XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
        leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);
        leftAxis.setTitle("温度");

        // 设置右侧坐标轴为数值坐标轴
        XDDFValueAxis rightAxis = chart.createValueAxis(AxisPosition.RIGHT);
        rightAxis.setCrosses(AxisCrosses.MAX);
        rightAxis.setTitle("数据值");

        // 设置数据源
        XDDFNumericalDataSource<Double> xs1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 127, 0, 0));
        XDDFNumericalDataSource<Double> ys1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 127, 1, 1));
        XDDFNumericalDataSource<Double> xs2 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 127, 0, 0));
        XDDFNumericalDataSource<Double> ys2 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 127, 2, 2));

        // 添加数据系列
        XDDFLineChartData data = (XDDFLineChartData) chart.createData(ChartTypes.LINE, bottomAxis, leftAxis);
        XDDFLineChartData.Series series1 = (XDDFLineChartData.Series) data.addSeries(xs1, ys1);
        series1.setTitle("折线图1", null);

        // 添加第二个数据系列
        XDDFLineChartData.Series series2 = (XDDFLineChartData.Series) data.addSeries(xs2, ys2);
        series2.setTitle("折线图2", null);
        series2.setSmooth(false); // 取消平滑曲线

        // 将第二个数据系列关联到右侧坐标轴
        chart.plot(data);
        chart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(1).getAxId().setVal(1);
        chart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(1).getIdx().setVal(1);

        // 保存Excel文件
        FileOutputStream fileOut = new FileOutputStream("input-1.xlsx");
        workbook.write(fileOut);
        fileOut.close();

        System.out.println("折线图已创建并保存到Excel文件中。");

    } catch (IOException e) {
        e.printStackTrace();
    }
}

}