Apache POI Excel 折线图生成示例

这个错误是因为chart.plot()方法的参数类型不正确。在chart.plot()方法中，需要传入XDDFChartData类型的参数，但是你传入了XDDFLineChartData类型的参数。

解决方法是将chart.plot()方法的参数修改为data，即chart.plot(data)。这样就可以正确地绘制图表了。

另外，你还有两处多余的chart.plot()方法调用，可以将其删除。

修改后的代码如下：

package '折线图';

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;

public class ExcelChartExample02 {

    public static void main(String[] args) {
        try {
            // 读取Excel文件
            FileInputStream fileIn = new FileInputStream('巴新EDEVU水库数据处理表.xlsx');
            XSSFWorkbook workbook = new XSSFWorkbook(fileIn);
            XSSFSheet sheet1 = workbook.getSheet('P9');
            XSSFSheet sheet2 = workbook.getSheet('P10');

            // 创建折线图
            XSSFDrawing drawing = sheet2.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);

            // 创建数据系列
            XDDFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
            XDDFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
            leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

            // 创建数据源
            XDDFNumericalDataSource<Double> xs1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(11, 85, 0, 0));
            XDDFNumericalDataSource<Double> ys1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet1, new CellRangeAddress(11, 85, 2, 2));
            XDDFNumericalDataSource<Double> xs2 = XDDFDataSourcesFactory.fromNumericCellRange(sheet2, new CellRangeAddress(11, 139, 0, 0));
            XDDFNumericalDataSource<Double> ys2 = XDDFDataSourcesFactory.fromNumericCellRange(sheet2, new CellRangeAddress(11, 139, 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('P9数据折线图', null);
            XDDFLineChartData.Series series2 = (XDDFLineChartData.Series) data.addSeries(xs2, ys2);
            series2.setTitle('P10数据折线图', null);

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

            // 创建'温度'工作表
            XSSFSheet sheet3 = workbook.createSheet('温度');

            // 将图表复制到'温度'工作表
            XSSFDrawing drawing2 = sheet3.createDrawingPatriarch();
            XSSFClientAnchor anchor2 = drawing2.createAnchor(0, 0, 0, 0, 0, 0, 10, 20);
            XSSFChart chart2 = drawing2.createChart(anchor2);
            chart2.plot(data);

            // 保存Excel文件
            FileOutputStream fileOut = new FileOutputStream('巴新EDEVU水库数据处理表.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();
        }
    }
}