使用Apache POI创建Excel折线图详解（Java）

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
            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);
	    // 将 series3 的 Y 轴设置为 rightAxis
            series3.setYAxis(rightAxis);

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

            // 保存Excel文件
            FileOutputStream fileOut = new FileOutputStream('output.xlsx');
            workbook.write(fileOut);
            fileOut.close();

            System.out.println('折线图已创建并保存到 output.xlsx 文件中。');

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