java IText：如何在 pdf 中添加空白页？
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IText: How to add blank page inside pdf?
提问by marioosh
I have pdf document, for example 25 pages. How to add one blank page beetwen page 10 and 11 ?
我有 pdf 文档，例如 25 页。如何在第 10 页和第 11 页之间添加一个空白页？
回答by Viezevingertjes
First hit on google:
第一次点击谷歌：
/*
* 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();
}
}
回答by Chandra
After you use, document.newPage();, it will be ignored if you don't add any content. So, if you need blank page, then add writer.setPageEmpty(false);right after calling newPage().
使用后，document.newPage();如果不添加任何内容，将被忽略。因此，如果您需要空白页，请writer.setPageEmpty(false);在调用newPage().
回答by megglos
Just have a look at the following method of PdfWriter:
看看PdfWriter的以下方法：
http://api.itextpdf.com/itext/com/itextpdf/text/pdf/PdfWriter.html#setPageEmpty(boolean)
http://api.itextpdf.com/itext/com/itextpdf/text/pdf/PdfWriter.html#setPageEmpty(boolean)
Should work like so:
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();
You tell the writer that the page is not empty, even though it is, so a new page will be created.
您告诉作者该页面不是空的，即使它是空的，因此将创建一个新页面。
