如何使用OpenPDF添加段落和边框

Question

我使用OpenPDF来生成PDF文档，并将页眉和页脚图像添加到PDF中。需要将段落添加到PDF的中心，其中一些文本内容是动态的，基于输入请求，所有内容都需要被边框包围。我能够生成的PDf与页眉和页脚添加到它，但有问题，增加段落中心的pdf和边框。任何帮助都是非常感谢的。

我尝试过通过添加表或使用画布来尝试不同的方法，但无法解决。

   public void generatePDF(String firstName, String lastName){
    try {
        Document doc = new Document();
        PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(DEST));
        //setting font family, color
        Font font = new Font(Font.HELVETICA, 16, Font.BOLDITALIC, Color.RED);
        doc.open();
        addHeaderImageToPDF(doc,writer);
        Paragraph para = new Paragraph("Hello! This PDF is created for "+firstName+" "+lastName, font);
        para.setAlignment(Element.ALIGN_MIDDLE);
        doc.add(para);
        addFooterImageToPDF(doc,writer);
        addBorderToPDF(doc);
        doc.close();
        writer.close();   
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }   
}

private void addBorderToPDF(Document document){
    Rectangle rect= new Rectangle(531.5f,820,38.5f,0); // you can resize rectangle 
    rect.enableBorderSide(1);
    rect.enableBorderSide(2);
    rect.enableBorderSide(4);
    rect.enableBorderSide(8);
    rect.setBorderColor(Color.BLACK);
    rect.setBorderWidth(2);
    document.add(rect);
}

private void addHeaderImageToPDF(Document document, PdfWriter writer){
    try {
        Image image = Image.getInstance(HEADER_IMAGE_PATH);
        //image = Image.getInstance(IMAGE_PATH);
        image.scalePercent(50f);
        //image.setAbsolutePosition(0, (float) (PageSize.A4.getHeight() - 20.0));
        image.setAbsolutePosition(40, 675);
        System.out.println(image.getScaledHeight());
        document.add(image);
        image.scaleToFit(100f, 100f);
        //document.add(image);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

private void addFooterImageToPDF(Document document, PdfWriter writer){
    try {
        Image image = Image.getInstance(FOOTER_IMAGE_PATH);
        //image = Image.getInstance(IMAGE_PATH);
        image.scalePercent(50f);
        //image.setAbsolutePosition(0, (float) (PageSize.A4.getHeight() - 20.0));
        image.setAbsolutePosition(40, 450);
        System.out.println(image.getScaledHeight());
        document.add(image);
        image.scaleToFit(100f, 100f);
        //document.add(image);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

想要在中间加上段落，整个PDF的内容应该用深蓝色的边框包围。任何帮助都是非常感谢的。

Answer 1

由于给定的标记图文、pdfbox和openpdf意味着可以自由选择PDF库，这里有一个使用iText 7创建带深蓝色边框的居中段落的示例(v7.1.7)：

带边框的居中段落

String firstName = "Mister";
String lastName = "Nine";
try (   PdfWriter pdfWriter = new PdfWriter(new File("CenterParagraph.pdf"));
        PdfDocument pdfDocument = new PdfDocument(pdfWriter);
        Document document = new Document(pdfDocument)   ) {
    Paragraph paragraph = new Paragraph("Hello! This PDF is created for "+firstName+" "+lastName);
    paragraph.setWidth(100).setBorder(new SolidBorder(new DeviceRgb(0f, 0f, 0.6f), 3));
    PageSize box = pdfDocument.getDefaultPageSize();
    document.showTextAligned(paragraph, (box.getLeft() + box.getRight()) / 2, (box.getTop() + box.getBottom()) / 2,
            TextAlignment.CENTER, VerticalAlignment.MIDDLE);
}

(https://github.com/mkl-public/testarea-itext7/blob/master/src/test/java/mkl/testarea/itext7/content/ShowTextAtPosition.java#L40 test testShowCenteredBorderedParagraph__)

导致

​

​

在书页的中间。

带有页眉和页脚图像和页面边框的居中段落。

String firstName = "Mister";
String lastName = "Nine";

Image img = null;
try (   InputStream imageResource = IMAGE_INPUT_STREAM ) {
    ImageData data = ImageDataFactory.create(StreamUtil.inputStreamToArray(imageResource));
    img = new Image(data);
    img.scaleToFit(100f, 100f);
}

try (   PdfWriter pdfWriter = new PdfWriter(new File("CenterParagraphWithExtras.pdf"));
        PdfDocument pdfDocument = new PdfDocument(pdfWriter);
        Document document = new Document(pdfDocument)   ) {
    PageSize box = pdfDocument.getDefaultPageSize();

    Paragraph paragraph = new Paragraph("Hello! This PDF is created for "+firstName+" "+lastName);
    paragraph.setWidth(100);
    document.showTextAligned(paragraph, (box.getLeft() + box.getRight()) / 2, (box.getTop() + box.getBottom()) / 2,
            TextAlignment.CENTER, VerticalAlignment.MIDDLE);

    PdfCanvas pdfCanvas = new PdfCanvas(pdfDocument.getLastPage());
    Rectangle borderRectangle = new Rectangle(box.getLeft() + 5, box.getBottom() + 5, box.getWidth() - 10, box.getHeight() - 10);
    pdfCanvas.setColor(new DeviceRgb(0f, 0f, 0.6f), false);
    pdfCanvas.setLineWidth(3);
    pdfCanvas.rectangle(borderRectangle);
    pdfCanvas.stroke();

    img.setFixedPosition(box.getLeft() + 40, box.getTop() - 150);
    document.add(img);
    img.setFixedPosition(box.getLeft() + 40, box.getBottom() + 50);
    document.add(img);
}

结果是

​

​