jsp - 使用itext获取pdf中的总页数并增加页眉中图像的高度

这是我的代码

<%
Class.forName("com.mysql.jdbc.Driver");
class HeaderAndFooter extends PdfPageEventHelper {
   private String name = "";
   protected Phrase footer;
   protected Phrase header;
   PdfTemplate total;
   Font headerFont = new Font(FontFamily.COURIER, 13, Font.UNDERLINE);
   Font footerFont = new Font(FontFamily.HELVETICA, 11, Font.BOLD);
   Font footerFont1 = new Font(FontFamily.TIMES_ROMAN, 9,Font.BOLDITALIC);
   String date1;
   public HeaderAndFooter(String name) {
    super();
    this.name = name;
    header = new Phrase("***** Header *****");
    footer = new Phrase("**** Footer ****");
  }


  @Override
   public void onEndPage(PdfWriter writer, Document document) {
     PdfContentByte cb = writer.getDirectContent();
     String headerContent =name;
     String footerContent = headerContent;
     String log="C:/Users/Desktop/671.png";
     float gap = (document.getPageSize().getWidth())/ 30;
     float hei=(document.getPageSize().getHeight() - 60);
     Image img1=null;
     try{
         String message="";
         Connection con=null;
         Statement st;

         try{
                 con = DriverManager.getConnection("jdbc:mysql://localhost:3306/87a", "root", "root");
                 st=con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
         String sqlText = "SELECT image FROM image";
         ResultSet rset = st.executeQuery(sqlText);
         while(rset.next()) {
                 Blob image = rset.getBlob("image");
                 img1= Image.getInstance(image.getBytes(1, (int) image.length()));
         }
         }catch (SQLException ex)
         {
                 message = "ERROR: " + ex.getMessage();
                 ex.printStackTrace();
                 }
                 finally {
                 if (con != null) {
                     //closes the database connection
                     try {
                         con.close();
                     } catch (SQLException ex) {
                         ex.printStackTrace();
                     }
                 }
                 }
       Image img = Image.getInstance(img1);
       //img.scalePercent((document.right()-document.left())/((float)img.getWidth())*100);
        cb.addImage(img, 570, 0, 0, 60, gap, hei);
     }catch(IOException e){}
     catch(DocumentException e){}
     ColumnText.showTextAligned(cb, Element.ALIGN_MIDDLE, new Phrase(String.format(" Page %d of", writer.getPageNumber()),footerFont), document.right() - 60 , document.bottom() - 15, 0);
  }
  }

OutputStream output=response.getOutputStream();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "inline; filename=details.pdf");
try{
        Document document = new Document(PageSize.A4, 20, 20, 70, 20);
PdfWriter writer=PdfWriter.getInstance(document, output);
document.open();
BaseFont bf = BaseFont.createFont("c:/windows/fonts/arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
writer.setPageEvent(new HeaderAndFooter(date));
XMLWorkerHelper worker = XMLWorkerHelper.getInstance();
List arrlist = new ArrayList();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/gla", "root", "root");
Statement st=con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs=st.executeQuery("SELECT * FROM user_start2 where date='"+date+"' ");
 while(rs.next()){
 arrlist.add(rs.getString("data"));
 }
 document.add(new Paragraph(ds,new com.itextpdf.text.Font(bf, 12,Font.UNDERLINE)));
for(int i=0;i<4;i++){
  String str =(String) arrlist.get(i);
  document.add(new Paragraph(str,new com.itextpdf.text.Font(bf, 12)));
}
document.close();
}catch(IOException e){e.printStackTrace();}
writer.flush();
writer.close();
output.close();
%>

一切正常，除了我没有得到总页数。

我想念什么？

最佳答案

看起来您在onEndPage事件中正在尝试设置总页数。我不相信它会在那里工作（它可能会工作，但是要关闭一页）。我认为您必须等到pdf完整后再在页面总数上加盖印记。这是我在vb.net（w / itextsharp）中的操作方式；我敢打赌，您可以从中提取需要的东西：

    ''' <summary>
    ''' Adds the page numbers to the bottom right hand side of the page
    ''' </summary>
    ''' <param name="PdfFile">The pdf file that needs numbering</param>
    ''' <returns>A byte array containing the numbered pdf file</returns>
    ''' <remarks>This is a stamping operation</remarks>
    Protected Shared Function AddPageNumbers(PdfFile As Byte()) As Byte()

        'prepare font
        Dim _bfTimes As BaseFont = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, False)

        Dim mem As New LengthFixingStream()

        Dim _reader As New PdfReader(PdfFile)
        Dim _stamper As New PdfStamper(_reader, mem)


        Dim PageCount As Integer = _reader.NumberOfPages
        For i As Integer = 1 To PageCount
            Dim _content As PdfContentByte = _stamper.GetOverContent(i)
            _content.SaveState()
            _content.BeginText()
            _content.SetFontAndSize(_bfTimes, 8)
            _content.SetTextMatrix(531, 18)
            _content.ShowText(String.Format("Page {0} of {1}", i, PageCount))
            _content.EndText()
            _content.RestoreState()

        Next

        _stamper.Close()

        AddPageNumbers = mem.GetBuffer()

    End Function

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该SO帖子解决了您的其他问题：Resize image