如何使用iText7为PDF文件添加完整的PDF页面作为背景 [英] How to add a full PDF-Page as Background for a PDF-File with iText7

问题描述

您好，我在iText 5上做了大量工作，并且对iText 7还是很陌生. 我试图弄清楚如何使用PDF文件将其作为模板放置到新的PDF文档中.

Hello I worked a lot with iText 5 and am very new to iText 7. I try to figure out how I can use a PDF-File to put it as a Template to my new PDF-Document.

目标是生成一个Letter，其中该布局由位于文本下方的静态PDF文件提供. 在iText5中，我使用了:

The goal is to generate a Letter, where the Layout is provieded by a static PDF-File lying under the text. In iText5 i used:

  public void onEndPage(PdfWriter pdfwriter, Document document, PdfReader templatePdf) {
            PdfContentByte cb=pdfwriter.getDirectContent(); 
            PdfImportedPage template = pdfWriter.getImportedPage(templatePdf, 1)
            cb.addTemplate(template, 0, 0);

我找到了一个通过PageEventHandler(IEventHandler)和PdfCanvas添加图像的教程，上面的Canvas = new PdfCanvas(page.newContentStreamAfter()， page.getResources()，pdfDoc); 但是Canvas不接受PDFPage.

I found a tutorial to add Images via PageEventHandler (IEventHandler) and PdfCanvas aboveCanvas = new PdfCanvas(page.newContentStreamAfter(), page.getResources(), pdfDoc); but the Canvas doesn't accept a PDFPage.

有没有人提示如何使用iText7做到这一点?

Has anyone a tip how to get this done with iText7?

非常感谢您的帮助！ 你的辛苦

Tanks a lot for your help! Yours Toking

推荐答案

感谢Samuel，您对XObject的提示非常有帮助.

Thanks to Samuel, your hint with the XObject was very helpful.

使用以下代码，我可以将PDF页面显示为背景.

With the following code I was able to show a PDF-Page as a background.

public void handleEvent(Event event) {

    PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
    PdfDocument pdfDoc = docEvent.getDocument();
    PdfPage page = docEvent.getPage();

    PdfFormXObject pageCopy;
    try {
        pageCopy = bgPage.copyAsFormXObject(pdfDoc);
        PdfCanvas canvas = new PdfCanvas(page);
        canvas.addXObject(pageCopy, 0, 0);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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