本教程将展示如何使用Spire.PDF for Java在PDF文档中添加有序列表和无序列表。

import com.spire.pdf.*;
import com.spire.pdf.graphics.*;
import com.spire.pdf.lists.*;
import java.awt.*;
import java.awt.geom.*;

public class list {
        public static void main(String[] args) {
        //创建PDFDocument对象
        PdfDocument doc = new PdfDocument();

        //设置边距
        PdfUnitConvertor unitCvtr = new PdfUnitConvertor();
        PdfMargins margin = new PdfMargins();
        margin.setTop(unitCvtr.convertUnits(2.54f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point));
        margin.setBottom(margin.getTop());
        margin.setLeft(unitCvtr.convertUnits(3.17f, PdfGraphicsUnit.Centimeter, PdfGraphicsUnit.Point));
        margin.setRight(margin.getLeft());

        //添加新的一页
        PdfPageBase page = doc.getPages().add(PdfPageSize.A4, margin);
         //画标题
        float y = 10;
        PdfBrush brush1 = PdfBrushes.getBlack();
        PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("宋体", Font.BOLD, 16), true);
       PdfStringFormat format1 = new PdfStringFormat(PdfTextAlignment.Center);
        page.getCanvas().drawString("这是标题", font1, brush1,     page.getCanvas().getClientSize().getWidth() / 2, y, format1);
        y = y + (float) font1.measureString("这是标题", format1).getHeight();
        y = y + 5;
        //设置列表格式和列表文字
        Rectangle2D rctg = new Rectangle2D.Float();
        rctg.setFrame(new Point(0, 0), page.getCanvas().getClientSize());
        PdfLinearGradientBrush brush =
                new PdfLinearGradientBrush(rctg, new PdfRGBColor(new PdfRGBColor(new Color(0,0,128))), new PdfRGBColor(new Color(255,69,0)), PdfLinearGradientMode.Vertical);
        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("宋体", Font.BOLD, 12), true);
        String formatted = "饮料\n调味品\n糖果\n奶制品\n谷物\n肉类\n蔬菜\n海鲜";
        //画无序列表
        PdfListBase list = new PdfUnorderedList(formatted);
        list.setFont(font);
        list.setIndent(8);
        list.setTextIndent(5);
        list.setBrush(brush);
        PdfLayoutResult result = list.draw(page, 0, y);
        y = (float) (result.getBounds().getHeight()+result.getBounds().getY());
        //画有序列表
        PdfSortedList sortedList = new PdfSortedList(formatted);
        sortedList.setFont(font);
        sortedList.setIndent(8);
        sortedList.setTextIndent(5);
        sortedList.setBrush(brush);
        sortedList.draw(page, 0, y);

        //保存文档 
        doc.saveToFile("list.pdf");
        doc.close();
    }
}

执行结果如下图：