iText 7 페이지 번호 넣기

샘플 코드입니다.

int n = pdf.getNumberOfPages();

Paragraph footer;

for (int page = 1; page <= n; page++) {

    footer = new Paragraph(String.format("Page %s of %s", page, n));

    document.showTextAligned(footer, 297.5f, 20, page,

        TextAlignment.CENTER, VerticalAlignment.MIDDLE, 0);

}

document.close();

만약 아래와 같은 오류가 난다면 immediateFlush를 false로 설정해야 합니다.

java.lang.NullPointerException

	at com.itextpdf.kernel.pdf.PdfDictionary.get(PdfDictionary.java:552)

	at com.itextpdf.kernel.pdf.PdfDictionary.get(PdfDictionary.java:146)

	at com.itextpdf.kernel.pdf.PdfPage.getContentStreamCount(PdfPage.java:203)

	at com.itextpdf.kernel.pdf.PdfPage.getLastContentStream(PdfPage.java:230)

	at com.itextpdf.kernel.pdf.canvas.PdfCanvas.getPageStream(PdfCanvas.java:2375)

	at com.itextpdf.kernel.pdf.canvas.PdfCanvas.<init>(PdfCanvas.java:236)

	at com.itextpdf.layout.renderer.DocumentRenderer.flushSingleRenderer(DocumentRenderer.java:118)

	at com.itextpdf.layout.renderer.RootRenderer.addChild(RootRenderer.java:225)

	at com.itextpdf.layout.RootElement.add(RootElement.java:108)

	at com.itextpdf.layout.Document.add(Document.java:143)

	at com.itextpdf.layout.Document.add(Document.java:68)

	at com.itextpdf.layout.RootElement.showTextAligned(RootElement.java:359)

예를 들어,

document = new Document(pdf, PageSize.A4);

라면 아래왜 같이 하면 됩니다.

document = new Document(pdf, PageSize.A4, false);