Page Size

In real world, documents created using PDF libraries may require an additional feature of setting custom page size. Fortunately PDFBox comes with API to specify page size as per standard units referred in day to day business. The page size are A0, A1, …, A6, LEGAL and LETTER.

public class PageSize {

  /**
   * Creates PDF with different page size.
   *
   * @param args
   * @throws Exception
   */
  public static void main(String[] args) throws Exception {
    PDDocument pdfDoc = new PDDocument();

    PDPage page = createPage(PDRectangle.A0);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A0");

    page = createPage(PDRectangle.A1);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A1");

    page = createPage(PDRectangle.A2);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A2");

    page = createPage(PDRectangle.A3);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A3");

    page = createPage(PDRectangle.A4);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A4");

    page = createPage(PDRectangle.A5);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A5");

    page = createPage(PDRectangle.A6);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "A6");

    page = createPage(PDRectangle.LEGAL);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "LEGAL");

    page = createPage(PDRectangle.LETTER);
    pdfDoc.addPage(page);
    writeTextToPage(pdfDoc, page, "LETTER");

    pdfDoc.save("d:/temp/page_size.pdf");
    pdfDoc.close();
  }

  /**
   * Creates new page with specified size.
   *
   * @param size Size for new page.
   * @return Returns page instance.
   */
  private static PDPage createPage(PDRectangle size) {
    return new PDPage(size);
  }

  /**
   * Writes given text to PDF page.
   *
   * @param pdfDoc An instance of PDF Document.
   * @param page   An instance of PDF Page.
   * @param text   Text to be written.
   */
  private static void writeTextToPage(PDDocument pdfDoc, PDPage page, String text) throws Exception {
    int textPosition = (int)(page.getBBox().getHeight() * (60f/100f));
    PDPageContentStream stream = new PDPageContentStream(pdfDoc, page);
    stream.beginText();
    stream.setFont(PDType1Font.HELVETICA, 12);
    stream.newLineAtOffset(10, textPosition);
    stream.showText(text);
    stream.endText();
    stream.close();
  }
}

Have a look at the createPage method. It specifies the desired page size while creating the PDPage instance. Also you will notice that writeTextToPage method calculates offset for text (60% from bottom), based on the size of the page. Since the page dimensions will differ for each page, the calculation is done based on the height retrieved using page.getBBox().getHeight() API.