生成PDF文件添加總頁數

　　在頁眉或者頁腳加上第x頁這樣的信息

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

　　document.setFooter(footer);

      document.open();  

• 在每頁顯示第x頁/共y頁這樣的功能

• 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("測試內容。。。。", 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) {
  //在每頁結束的時候把“第x頁”信息寫道模版指定位置
  PdfContentByte cb = writer.getDirectContent();
  cb.saveState();
  String text ="第"+ writer.getPageNumber() +"頁,共";
  cb.beginText();
  cb.setFontAndSize(bf, 8);
  cb.setTextMatrix(460, 786);//定位“第x頁,共” 在具體的頁面調試時候需要更改這xy的坐標
  cb.showText(text);
  cb.endText();
  cb.addTemplate(tpl, 492, 786);//定位“y頁” 在具體的頁面調試時候需要更改這xy的坐標
  cb.saveState();
  cb.stroke();
  cb.restoreState();
  cb.closePath();//sanityCheck();
  }

  public void onCloseDocument(PdfWriter writer, Document document) {
  //關閉document的時候獲取總頁數，並把總頁數按模版寫道之前預留的位置
  tpl.beginText();
  tpl.setFontAndSize(bf, 8);
  tpl.showText(Integer.toString(writer.getPageNumber() - 1)+"頁");
  tpl.endText();
  tpl.closePath();//sanityCheck();
  }
  }

官方頁面有具體實現的例子，連接地址： 
http://itextdocs.lowagie.com/tutorial/directcontent/pageevents/index.php 
源碼： 
http://itextdocs.lowagie.com/examples/com/lowagie/examples/directcontent/pageevents/PageNumbersWatermark.java

 

其他相關學習連接：http://howtodoinjava.com/apache-commons/create-pdf-files-in-java-itext-tutorial/