如何在Apache POI XSSFChart中旋转文本标签

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

public class XSSFChartExample {
    public static void main(String[] args) throws Exception {
        // 创建工作簿和工作表
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Chart Example");

        // 创建数据行和单元格
        Row row = sheet.createRow(0);
        Cell cell1 = row.createCell(0);
        Cell cell2 = row.createCell(1);
        cell1.setCellValue("Category 1");
        cell2.setCellValue(10);

        // 创建图表
        Drawing<?> drawing = sheet.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 2, 2, 10, 20);
        Chart chart = drawing.createChart(anchor);
        ChartLegend legend = chart.getOrCreateLegend();
        legend.setPosition(LegendPosition.TOP_RIGHT);

        // 创建柱状图
        ChartAxis bottomAxis = chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);
        ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);
        ChartDataSource<Number> xs = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 0, 1, 1));
        ChartDataSource<String> ys = DataSources.fromStringCellRange(sheet, new CellRangeAddress(0, 0, 0, 0));
        ChartData data = chart.getChartDataFactory().createBarChartData(xs, ys);
        chart.plot(data, bottomAxis, leftAxis);

        // 获取绘图区域对象
        XSSFChart xssfChart = (XSSFChart) chart;
        XSSFChartPlot plot = xssfChart.getChartPlot();

        // 获取数据标签对象
        XSSFChartDataLabel dataLabel = plot.getDataLabel();

        // 设置数据标签的显示位置和方向
        dataLabel.setPosition(DataLabelPosition.OUTSIDE_END);
        dataLabel.setShowLeaderLines(true);

        // 获取分类轴对象
        XSSFCategoryAxis categoryAxis = plot.getCategoryAxis();

        // 获取刻度标签对象
        XSSFChartAxisTickLabel tickLabel = categoryAxis.getTickLabel();

        // 设置刻度标签的旋转角度
        tickLabel.setRotation((short) 45);

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

        System.out.println("Chart example created successfully.");
    }
}