iText - 如何在现有PDF上标记图像并创建锚点 [英] iText - How to stamp image on existing PDF and create an anchor

问题描述

我有一个现有文件，我想在绝对位置标记图像。
我能够做到这一点，但我也想让这个图像可以点击：当用户点击图像上的
时，我希望PDF转到文档的最后一页。

I have an existing document, onto which I would like to stamp an image at an absolute position. I am able to do this, but I would also like to make this image clickable: when a user clicks on the image I would like the PDF to go to the last page of the document.

这是我的代码：

PdfReader readerOriginalDoc = new PdfReader("src/main/resources/test.pdf");         
PdfStamper stamper = new PdfStamper(readerOriginalDoc,new FileOutputStream("NewStamper.pdf"));
PdfContentByte content = stamper.getOverContent(1);
Image image = Image.getInstance("src/main/resources/images.jpg");
image.scaleAbsolute(50, 20);
image.setAbsolutePosition(100, 100);
image.setAnnotation(new Annotation(0, 0, 0, 0, 3));
content.addImage(image);
stamper.close();

知道如何做到这一点吗？

Any idea how to do this ?

推荐答案

您正在使用的技术仅适用于从头开始创建文档。

You are using a technique that only works when creating documents from scratch.

请查看 AddImageLink 示例，了解如何添加图像和链接，使该图像可以点击现有文档：

Please take a look at the AddImageLink example to find out how to add an image and a link to make that image clickable to an existing document:

public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
    PdfReader reader = new PdfReader(src);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
    Image img = Image.getInstance(IMG);
    float x = 10;
    float y = 650;
    float w = img.getScaledWidth();
    float h = img.getScaledHeight();
    img.setAbsolutePosition(x, y);
    stamper.getOverContent(1).addImage(img);
    Rectangle linkLocation = new Rectangle(x, y, x + w, y + h);
    PdfDestination destination = new PdfDestination(PdfDestination.FIT);
    PdfAnnotation link = PdfAnnotation.createLink(stamper.getWriter(),
            linkLocation, PdfAnnotation.HIGHLIGHT_INVERT,
            reader.getNumberOfPages(), destination);
    link.setBorder(new PdfBorderArray(0, 0, 0));
    stamper.addAnnotation(link, 1);
    stamper.close();
}

您已经有关于正确添加图像的部分。请注意，我为图像的位置及其尺寸创建参数：

You already have the part about adding the image right. Note that I create parameters for the position of the image as well as its dimensions:

float x = 10;
float y = 650;
float w = img.getScaledWidth();
float h = img.getScaledHeight();

我使用这些值来创建矩形 object：

I use these values to create a Rectangle object:

Rectangle linkLocation = new Rectangle(x, y, x + w, y + h);

这是我们用 PdfAnnotation <创建的链接注释的位置/ code> class。您需要使用 addAnnotation（）方法单独添加此注释。

This is the location for the link annotation we are creating with the PdfAnnotation class. You need to add this annotation separately using the addAnnotation() method.

您可以查看结果这里： link_image.pdf
如果点击我图标，您跳转到文档的最后一页。

You can take a look at the result here: link_image.pdf If you click on the i icon, you jump to the last page of the document.

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