生成PDF文件添加总页数

　　在页眉或者页脚加上第x页这样的信息

　　HeaderFooter footer = new HeaderFooter(new Phrase("第：",FontChinese), new Phrase("页",FontChinese));     　　footer.setBorder(Rectangle.NO_BORDER);    

　　document.setFooter(footer);

      document.open();  

• 在每页显示第x页/共y页这样的功能

• import java.io.FileOutputStream;

  import com.lowagie.text.Document;
  import com.lowagie.text.Element;
  import com.lowagie.text.ExceptionConverter;
  import com.lowagie.text.Font;
  import com.lowagie.text.PageSize;
  import com.lowagie.text.Paragraph;
  import com.lowagie.text.pdf.BaseFont;
  import com.lowagie.text.pdf.PdfContentByte;
  import com.lowagie.text.pdf.PdfPageEventHelper;
  import com.lowagie.text.pdf.PdfTemplate;
  import com.lowagie.text.pdf.PdfWriter;

  public class PdfExport extends PdfPageEventHelper{

  public PdfTemplate tpl;
  public BaseFont bf;
  public static void main(String[] args) {
  Document document = new Document(PageSize.A4, 20, 20, 20, 20);
  try {
  PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("D:HelloItext.pdf"));
  writer.setPageEvent(new PdfExport());
  BaseFont bfChinese = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
  document.open();
  Paragraph title = new Paragraph("测试内容。。。。", new Font(bfChinese,15));
  title.setAlignment(Element.ALIGN_CENTER);
  document.add(title);
  } catch (Exception de) {
  de.printStackTrace();
  }
  document.close();
  }

  public void onOpenDocument(PdfWriter writer, Document document) {
  try {
  tpl = writer.getDirectContent().createTemplate(100, 100);
  bf = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
  }catch(Exception e) {
  throw new ExceptionConverter(e);
  }
  }

  public void onEndPage(PdfWriter writer, Document document) {
  //在每页结束的时候把“第x页”信息写道模版指定位置
  PdfContentByte cb = writer.getDirectContent();
  cb.saveState();
  String text ="第"+ writer.getPageNumber() +"页,共";
  cb.beginText();
  cb.setFontAndSize(bf, 8);
  cb.setTextMatrix(460, 786);//定位“第x页,共” 在具体的页面调试时候需要更改这xy的坐标
  cb.showText(text);
  cb.endText();
  cb.addTemplate(tpl, 492, 786);//定位“y页” 在具体的页面调试时候需要更改这xy的坐标
  cb.saveState();
  cb.stroke();
  cb.restoreState();
  cb.closePath();//sanityCheck();
  }

  public void onCloseDocument(PdfWriter writer, Document document) {
  //关闭document的时候获取总页数，并把总页数按模版写道之前预留的位置
  tpl.beginText();
  tpl.setFontAndSize(bf, 8);
  tpl.showText(Integer.toString(writer.getPageNumber() - 1)+"页");
  tpl.endText();
  tpl.closePath();//sanityCheck();
  }
  }

官方页面有具体实现的例子，连接地址： 
http://itextdocs.lowagie.com/tutorial/directcontent/pageevents/index.php 
源码： 
http://itextdocs.lowagie.com/examples/com/lowagie/examples/directcontent/pageevents/PageNumbersWatermark.java

其他相关学习连接：http://howtodoinjava.com/apache-commons/create-pdf-files-in-java-itext-tutorial/