java - IText：如何在 pdf 中添加空白页？

Question

我有 pdf 文件，例如 25 页。如何在第 10 页和第 11 页之间添加一个空白页？

Answer 1

第一次上谷歌：

/*
 * This class is part of the book "iText in Action - 2nd Edition"
 * written by Bruno Lowagie (ISBN: 9781935182610)
 * For more info, go to: http://itextpdf.com/examples/
 * This example only works with the AGPL version of iText.
 */

package part1.chapter05;

import java.io.FileOutputStream;
import java.io.IOException;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;

public class NewPage {

/** Path to the resulting PDF file. */
public static final String RESULT
    = "results/part1/chapter05/new_page.pdf";

/**
 * Main method creating the PDF.
 * @param    args    no arguments needed
 * @throws IOException 
 * @throws DocumentException 
 */
public static void main(String[] args) throws IOException, DocumentException {
    // step 1
    Document document = new Document();
    // step 2
    PdfWriter writer
        = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
    // step 3
    document.open();
    // step 4
    document.add(new Paragraph("This page will NOT be followed by a blank page!"));
    document.newPage();
    // we don't add anything to this page: newPage() will be ignored
    document.newPage();
    document.add(new Paragraph("This page will be followed by a blank page!"));
    document.newPage();
    writer.setPageEmpty(false);
    document.newPage();
    document.add(new Paragraph("The previous page was a blank page!"));
    // step 5
    document.close();

    }
}

Answer 2

使用后，document.newPage();如果不添加任何内容，它将被忽略。因此，如果您需要空白页，请writer.setPageEmpty(false);在调用后立即添加newPage()。

Answer 3

只需看一下 PdfWriter 的以下方法：

http://api.itextpdf.com/itext/com/itextpdf/text/pdf/PdfWriter.html#setPageEmpty(boolean )

应该像这样工作：

Document doc = new Document();
PdfWriter pdfWriter
        = PdfWriter.getInstance(document, new FileOutputStream("file.pdf"));
pdfWriter.setPageEmpty(false);
doc.newPage();
doc.close();

您告诉作者该页面不是空的，即使它是空的，所以将创建一个新页面。