itext7 生成pdf操作过于复杂，特别是封面、目录页码以及页眉页脚的处理需要基于事件处理，因此写了个简单的类库用于简化操作，只用关注文档内容的构建而无需关注其他；

代码地址： https://gitee.com/zherc/itext7-simple

maven依赖

<dependency>
  <groupId>io.gitee.zherc</groupId>
  <artifactId>itext7-simple</artifactId>
  <version>0.0.1</version>
</dependency>

实现PDF渲染器

渲染顺序为 内容>目录>封面

public class TestPdfRender implements PdfRender {
    

    /**
     * 渲染封面
     * @param document 文档对象
     */
    @Override
    public void cover(ItextDocument document) {
    
        try {
    
            Div div = new Div();
            div.setDestination("cover");
            div.add(new Paragraph("封面").setFontColor(Color.parse("#FFFFFF")));
            div.setWidth(document.getPageWidth());
            div.setHeight(document.getPageHeight());
            PdfImageXObject imageXObject = new PdfImageXObject(ImageDataFactory.create(new URL("https://zhiper-cdn.oss-cn-shanghai.aliyuncs.com/2051961.jpg")));
            BackgroundImage image = new BackgroundImage(imageXObject);
            div.setProperty(Property.BACKGROUND_IMAGE, image);

            Table table = new Table(4);
            table.setBorder(Border.NO_BORDER);
            table.addHeaderCell("标题一");
            table.addHeaderCell("标题二");
            table.addHeaderCell("标题三");
            table.addHeaderCell("标题四");
            div.add(table);

            document.add(div);
        } catch (Exception e) {
    

        }
        PdfOutline outlines = document.getPdfDocument().getOutlines(true);
        outlines.addOutline("封面", 0).addDestination(PdfDestination.makeDestination(new PdfString("cover")));
    }

    /**
     * 渲染目录
     * @param document 文档对象
     */
    @Override
    public void directory(ItextDocument document) {
    
        Div div = new Div();
        div.add(new Paragraph("目录").setDestination("directory").setHorizontalAlignment(HorizontalAlignment.CENTER));
        ItextPdfDocument itextPdfDocument = document.getItextPdfDocument();
        itextPdfDocument.eachCatalog(catalog -> {
    
            Link link = new Link(catalog.getTitle(), PdfAction.createGoTo(catalog.getCode()));
            Paragraph paragraph = new Paragraph(link);
            paragraph.add("......................")
                    .add(catalog.getPageNumber() + "")
                    .setFirstLineIndent(10 * (1 - catalog.getLevel()));
            div.add(paragraph);
        });

        PdfOutline outlines = document.getPdfDocument().getOutlines(true);
        outlines.addOutline("目录", 0)
                .addDestination(PdfDestination.makeDestination(new PdfString("directory")));
        document.add(div);
    }

    /**
     * 渲染页眉
     * @param header 页眉对象
     */
    @Override
    public void header(Header header) {
    
        try {
    
            Table table = new Table(1);
            table.setBorder(Border.NO_BORDER);
            Cell cell = new Cell();
            cell.setTextAlignment(TextAlignment.CENTER);
            Paragraph paragraph = new Paragraph("页眉" + header.getPageNumber());
            cell.setVerticalAlignment(VerticalAlignment.MIDDLE);
            paragraph.setBackgroundColor(Color.parse("#d0d0d0"));
            cell.add(paragraph);
            table.addCell(cell);
            header.layout(table);
        } catch (Exception e) {
    
            e.printStackTrace();
        }
//      header.addText(new Text(Point.build(0, 0), "页眉" + header.getPageNumber()).centered());
    }

    /**
     * 渲染页脚
     * @param footer 页脚对象
     */
    @Override
    public void footer(Footer footer) {
    
//        footer.addText(new Text(Point.build(0, 0), "第" + footer.getPageNumber() + "页")
//                .style(new FontStyle(10)).align(HorizontalAlign.CENTER, VerticalAlign.MIDDLE));
        Table table = new Table(3);
        table.setBorderTop(new SolidBorder(Color.parse("#EEEEEE"), 2f));
        table.addCell(new Cell().setBorder(Border.NO_BORDER).add(new Paragraph("左边")).setTextAlignment(TextAlignment.LEFT));
        table.addCell(new Cell().setBorder(Border.NO_BORDER).add(new Paragraph("第" + footer.getPageNumber() + "页")).setTextAlignment(TextAlignment.CENTER));
        table.addCell(new Cell().setBorder(Border.NO_BORDER).add(new Paragraph("右边")).setTextAlignment(TextAlignment.RIGHT));
        footer.layout(table);
    }

    /**
     * 渲染文档内容
     * @param document 文档对象
     */
    @SneakyThrows
    @Override
    public void body(ItextDocument document) {
    

        ItextPdfDocument pdfDocument = document.getItextPdfDocument();

        for (int i = 0; i < 10; i++) {
    
            String title = "第" + i + "部分内容";
            // 添加目录
            H1 h1 = new H1(title);
            Catalog catalog = pdfDocument.addCatalog(h1, title);
            // 添加书签
            pdfDocument.addBookmark(h1, catalog.getCode());
            document.add(new Div().add(h1));
            Div div = new Div();
            Table table = new Table(6);
            table.setBorder(Border.NO_BORDER);
            table.addHeaderCell("标题一");
            table.addHeaderCell("标题二");
            table.addHeaderCell("标题三");
            table.addHeaderCell("标题四");
            table.addHeaderCell("标题五");
            table.addHeaderCell("标题六");
            for (int j = 0; j < 360; j++) {
    
                Cell cell = new Cell();
                cell.setBorder(Border.NO_BORDER);
                cell.add(new Paragraph("表格"));
                table.addCell(cell);
            }
            table.setWidth(document.getWidth());
            table.setHorizontalAlignment(HorizontalAlignment.CENTER);
            div.add(table);

            String secondTitle = title + "二级书签";
            H2 h2 = new H2(secondTitle);
            Catalog secCatalog = pdfDocument.addCatalog(h2);
            div.add(h2);
            pdfDocument.addBookmark(h2, secCatalog.getCode());

            Rect bodyRect = document.getBodyRect();

            // canvas绘图
            Rectangle boundingBox = new Rectangle(0,0, bodyRect.getWidth(),200);
            PdfFormXObject xObject = new PdfFormXObject(boundingBox);
            xObject.makeIndirect(pdfDocument);//Make sure the XObject gets added to the document
            PDFCanvas pCanvas = new PDFCanvas(xObject, pdfDocument);//Create a canvas from the XObject
            pCanvas.text(Point.build(60, 60), "吃个桃桃", "#d3d3d3", 12);
            pCanvas.rectangle(Point.build(20, 20), 30, 30).setFillColor(Color.BLUE).fill();

//            Canvas canvas = new Canvas(xObject, pdfDocument);//Create a canvas from the XObject
//            canvas.setRenderer(new CanvasRenderer(canvas){
    
//                @Override
//                public void addChild(IRenderer renderer) {
    
//                    super.addChild(renderer);
//                }
//            });
            pCanvas.draw(canvas -> {
    
                canvas.setFontColor(Color.RED);
                canvas.showTextAligned("吃个桃桃好凉凉", 200, 100, TextAlignment.LEFT, 90);
            });
            pCanvas.text(Point.build(60, 80), "一个小桃子", "#d3d3d3", 12);
            Image rect = new Image(xObject);
//            rect.setAutoScale(true);
//            rect.setBackgroundColor(Color.parse("#000000"));
            div.add(rect);

//            div.add(rect);
            document.add(div);
            /**
             * 将文本放置在指定位置并旋转角度
             */
            document.showTextAligned("吃个桃桃好凉凉0", 90, 90, TextAlignment.LEFT);
            document.showTextAligned("吃个桃桃好凉凉30", 90, 90, TextAlignment.LEFT, 30);
            document.showTextAligned("吃个桃桃好凉凉60", 90, 90, TextAlignment.LEFT, 60);
            document.showTextAligned("吃个桃桃好凉凉90", 90, 90, TextAlignment.LEFT, 90);
            document.showTextAlignedKerned("吃个桃桃好凉凉120", 90, 90, TextAlignment.LEFT, VerticalAlignment.MIDDLE, 120);
//            document.add(SvgUtil.convert(svg, pdfDocument).setHorizontalAlignment(HorizontalAlignment.CENTER));

//            PdfPage page = pdfDocument.getPage(pdfDocument.getNumberOfPages());
//            Canvas canvas = new Canvas(page);
//            canvas.circle(Point.build(200, 400), 100).setFillColor(Color.parse("#EEEEEE")).fill();
//            canvas.beginText().setFontAndSize(pdfDocument.getDefaultFont(), 12).setTextRise(120).showText("中文").endText();

            if (i < 9) document.nextPage();
        }


    }
}

配置PDF结构 调用渲染器生成PDF

class Generate{
    

    public static final String output = System.getProperty("user.dir") + "\\test.pdf";
    public static final String font = System.getProperty("user.dir") + "\\msyh.ttf";
    
    public void setup(){
    
        

        // 设置输出文件以及字体
        PdfSetup setup = new PdfSetup(output, font);
        // 是否需要目录
        setup.setDirectory(true);
        // 是否需要封面
        setup.setCover(true);
        // 是否需要页脚
        setup.setFooter(true);
        // 是否需要页眉
        setup.setHeader(true);
        
        // 根据渲染器以及PDF设置生成PDF
        Itext7Pdf.getPdf(new TestPdfRender(), setup).write();
    }
}