根据导出的数据绘制柱状图、饼状图等图形

[liuce259826]

目前easyExcel可以导出各种复杂的excel，但是如果需要在导出excel的同时绘制柱形图之类的，这个好像是做不到的，在文档中也没有看到相关的描述，如果可以向poi一样绘制各种图形的话，这会更好

[ljluestc]

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFChart;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.util.IOUtils;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ExcelChartExample {
    public static void main(String[] args) {
        try (Workbook workbook = new XSSFWorkbook()) {
            Sheet sheet = workbook.createSheet("Bar Chart Example");

            // Create some data
            Row row;
            Cell cell;
            for (int r = 0; r < 5; r++) {
                row = sheet.createRow(r);
                for (int c = 0; c < 2; c++) {
                    cell = row.createCell(c);
                    if (c == 0) {
                        cell.setCellValue("Category " + (r + 1));
                    } else {
                        cell.setCellValue((r + 1) * 10);
                    }
                }
            }

            // Create a bar chart
            Drawing<?> drawing = sheet.createDrawingPatriarch();
            ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 5, 1, 15, 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);
            ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);
            leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

            ChartDataSource<Number> xs = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 4, 0, 0));
            ChartDataSource<Number> ys = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 4, 1, 1));

            data.addSeries(xs, ys);

            chart.plot(data, bottomAxis, leftAxis);

            // Save the Excel file
            try (FileOutputStream fileOut = new FileOutputStream("BarChartExample.xlsx")) {
                workbook.write(fileOut);
            }

            System.out.println("Excel file with chart created successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}