Java 代码

import com.spire.pdf.*;
import com.spire.pdf.graphics.*;
import com.spire.pdf.lists.PdfListItem;
import com.spire.pdf.lists.PdfOrderedMarker;
import com.spire.pdf.lists.PdfSortedList;

import java.awt.*;
import java.awt.geom.Point2D;

public class List2 {
    public static void main(String[] args) {
        //创建PdfDocument对象
        PdfDocument pdf = new PdfDocument();

        //设置页边距
        PdfMargins margin = new PdfMargins(60, 60, 40, 40);

        //添加一页
        PdfPageBase page = pdf.getPages().add(PdfPageSize.A4, margin);

        //初始化x,y坐标
        float x = 0;
        float y = 15;

        //创建画刷
        PdfBrush blackBrush = PdfBrushes.getBlack();
        PdfBrush orangeBrush = PdfBrushes.getOrange();
        PdfBrush greenBrush = PdfBrushes.getLimeGreen();

        //创建两个字体
        PdfTrueTypeFont titleFont = new PdfTrueTypeFont(new Font("微软雅黑",Font.BOLD,9),true);
        PdfTrueTypeFont listFont = new PdfTrueTypeFont(new Font("微软雅黑",Font.PLAIN,9),true);

        //在指定位置绘制标题
        String title = "第 1 章 概 述";
        page.getCanvas().drawString(title, titleFont, blackBrush, x, y);
        y = y + (float) titleFont.measureString(title).getHeight();
        y = y + 5;

        //创建两个编号列表符号
        PdfOrderedMarker marker1 = new PdfOrderedMarker(PdfNumberStyle.Upper_Roman, listFont);//罗马数字
        PdfOrderedMarker marker2 = new PdfOrderedMarker(PdfNumberStyle.Numeric, listFont);//阿拉伯数字

        //创建一个父级列表
        String parentListContent = "第一节 故事线索\n"
                + "第二节 剧情发展";
        PdfSortedList parentList = new PdfSortedList(parentListContent);
        parentList.setFont(listFont);
        parentList.setIndent(8);
        parentList.setBrush(orangeBrush);
        parentList.setMarker(marker1);

        //创建子列表subList_1
        String subListContent_1 = "历史背景\n"
                + "人物关系\n"
                + "故事矛盾";
        PdfSortedList subList_1 = new PdfSortedList(subListContent_1);
        subList_1.setIndent(16);
        subList_1.setFont(listFont);
        subList_1.setBrush(greenBrush);
        subList_1.setMarker(marker2);

        //创建子列表subList_2
        String subListContent_2 = "案情分析\n"
                + "线索梳理\n"
                + "证物获取\n"
                + "证人供述";
        PdfSortedList subList_2 = new PdfSortedList(subListContent_2);
        subList_2.setIndent(16);
        subList_2.setFont(listFont);
        subList_2.setBrush(greenBrush);
        subList_2.setMarker(marker2);

        //将subList_1设置为父列表第一个元素下的子列表
        PdfListItem item_1 = parentList.getItems().get(0);
        item_1.setSubList(subList_1);

        //将subList_2设置为父列表第二个元素下的子列表
        PdfListItem item_2 = parentList.getItems().get(1);
        item_2.setSubList(subList_2);

        //绘制父列表到页面指定位置
        PdfTextLayout textLayout = new PdfTextLayout();
        textLayout.setBreak(PdfLayoutBreakType.Fit_Page);
        textLayout.setLayout(PdfLayoutType.Paginate);
        parentList.draw(page,new Point2D.Float(x,y),textLayout);

        //保存文档
        pdf.saveToFile("MultiLevelList.pdf");
        pdf.dispose();
    }
}

执行程序后，在生成的PDF文档中可查看多级列表添加效果：