Java 如何生成 Excel 柱状图？

可以通过GcExcel来实现柱状图，GcExcel支持各种Excel图表，具体可以参考：图表类型 - GcExcel 中文文档Java版 | 服务端高性能表格组件 - 葡萄城生成柱状图的代码如下：

public void CreateColumnChart() {
    // Create a new workbook
    Workbook workbook = new Workbook();

    IWorksheet worksheet = workbook.getWorksheets().get(0);
    IShape shape = worksheet.getShapes().addChart(ChartType.ColumnClustered, 250, 20, 360, 230);
    worksheet.getRange("A1:C6").setValue(new Object[][]{
            {103, 121, 109},
            {56, 94, 115},
            {116, 89, 99},
            {55, 93, 70},
            {114, 114, 83},
            {125, 138, 136}
    });

    shape.getChart().getSeriesCollection().add(worksheet.getRange("A1:C6"), RowCol.Columns);
    shape.getChart().getChartTitle().setText("Column Clustered Chart");

    // Save to an excel file
    workbook.save("output/ColumnClusteredChart.xlsx");
}