使用itext 7，我遵循了y教程的第x页-https://kb.itextpdf.com/home/it7kb/ebooks/itext-7-building-blocks/chapter-7-handling-events-setting-viewer-preferences-and-printer-properties#chapter7：手持通风口；设置ViewerPreferences和PrinterProperties解决%22pagexofy%22问题我们的要求是将页码放在右下角。我尝试了占位符和初始“第x页，共页”的x，y位置的变化，但没有得到正确的位置。如果总页数为3位数，则与“of”重叠。如果总页数为2位数-则“of”和“total”之间有空格。我如何定位它，以避免有额外的空格或重叠字符。这是密码-

...
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float topMargin = 30;
float bottomMargin = topMargin + 20;
float rightMargin = topMargin;
float leftMargin = topMargin;
Document document = new Document(pdf, PageSize.A4);      
document.setMargins(topMargin, rightMargin, bottomMargin, leftMargin);
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PageXofY pageXofYEvent = new PageXofY(pdf, document);
pdf.addEventHandler(PdfDocumentEvent.START_PAGE, pageXofYEvent);
pageXofYEvent.writeTotal(pdf);

public class PageXofY implements IEventHandler
{
  protected PdfFormXObject placeholder;
  PdfFont font = ITextFonts.getWriterBaseFont();

  protected float side = 20;
  protected float x = 300;
  protected float y = 30;
  protected float space = 10f;
  protected float descent = 3;
  Document document;
  float pWidth = 0;

  public PageXofY(PdfDocument pdf, Document document)
  {
    placeholder = new PdfFormXObject(new Rectangle(-20, -15, 100, 100));
    this.document = document;
  }

  @Override
  public void handleEvent(Event event)
  {    
    PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
    PdfDocument pdf = docEvent.getDocument();
    PdfPage page = docEvent.getPage();
    int pageNumber = pdf.getPageNumber(page);

    Rectangle pageSize = page.getPageSize();
    PdfCanvas pdfCanvas = new PdfCanvas(page.getLastContentStream(), page.getResources(), pdf);
    Canvas canvas = new Canvas(pdfCanvas, pdf, pageSize);

    Paragraph p = new Paragraph().add("Page ").add(String.valueOf(pageNumber)).add(" of ")
        .setFont(font).setFontSize(8).setMarginTop(10f);
    pWidth = TableColumnSpacer.getParagraphWidth(p, document);      
    x = pageSize.getRight() - document.getRightMargin() - pWidth - 4f;
    y = pageSize.getBottom() + 30 ;//document.getBottomMargin();            
    canvas.showTextAligned(p, x, y, TextAlignment.LEFT, VerticalAlignment.BOTTOM);    
    pdfCanvas.addXObjectAt(placeholder, x - space , y - 18);
    pdfCanvas.release();
  }

  public void writeTotal(PdfDocument pdf)
  {
    Canvas canvas = new Canvas(placeholder, pdf);

    Paragraph p = new Paragraph(String.valueOf(pdf.getNumberOfPages())).setFont(font).setFontSize(8).setMarginTop(10f); 
    canvas.showTextAligned(p, 30, descent, TextAlignment.LEFT, VerticalAlignment.BOTTOM);
  }
}