使用 Apache POI 在 Excel 中创建折线图 - 代码示例

import org.apache.poi.ss.usermodel.; 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 ExcelChartExample05 {

public static void main(String[] args) {
    try {
        // 读取Excel文件
        FileInputStream fileIn = new FileInputStream('input.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, 3, 9, 9, 19);
        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
        XDDFDateAxis bottomAxis = chart.createDateAxis(AxisPosition.BOTTOM);
        bottomAxis.setCrosses(AxisCrosses.AUTO_ZERO);
        bottomAxis.setTitle('时间');

        // 设置时间格式
        SimpleDateFormat dateFormat = new SimpleDateFormat('yyyy-MM-dd');
        for (int i = 1; i <= 66; i++) {
            XSSFRow row = sheet1.getRow(i);
            if (row != null) {
                Cell cell = row.getCell(0);
                if (cell != null && cell.getCellType() == CellType.NUMERIC) {
                    Date date = cell.getDateCellValue();
                    String formattedDate = dateFormat.format(date);
                    bottomAxis.setTickLabelPosition(AxisTickLabelPosition.NEXT_TO);
                }
            }
        }

        // 设置纵坐标轴
        XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
        leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);
        leftAxis.setTitle('数据值');

        // 设置次要纵坐标轴
        XDDFValueAxis rightAxis = chart.createValueAxis(AxisPosition.RIGHT);
        rightAxis.setCrosses(AxisCrosses.MAX);
        rightAxis.setTitle('次要数据值');

        // 设置数据源
        XDDFNumericalDataSource<Double> xs1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 66, 0, 0));
        XDDFNumericalDataSource<Double> ys1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 66, 1, 1));
        XDDFNumericalDataSource<Double> ys2 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 66, 2, 2));
        XDDFNumericalDataSource<Double> ys3 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(1, 66, 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('P1数据折线图', null);
        series1.setSmooth(false);
        series1.setMarkerStyle(MarkerStyle.CIRCLE);
        XDDFLineChartData.Series series2 = (XDDFLineChartData.Series) data.addSeries(xs1, ys2);
        series2.setTitle('P1数据折线图', null);
        series2.setSmooth(false);
        series2.setMarkerStyle(MarkerStyle.CIRCLE);

        // 添加次要数据系列
        CTLineSer ctLineSer3 = (CTLineSer) data.getChart().getCTChart().getPlotArea().getLineChartArray(0).addNewSer();
        ctLineSer3.addNewAxId().setVal(rightAxis.getId());
        ctLineSer3.addNewIdx().setVal(2);
        ctLineSer3.addNewOrder().setVal(2);
        XDDFLineChartData.Series series3 = (XDDFLineChartData.Series) data.addSeries(xs1, ys3);
        series3.setTitle('次要数据折线图', null);
        series3.setSmooth(false);
        series3.setMarkerStyle(MarkerStyle.CIRCLE);

        // 绘制图表
        chart.plot(data);

        // 保存Excel文件
        FileOutputStream fileOut = new FileOutputStream('input.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();
    }
}

}