Java 如何使用iText在每页上添加总页码？
如何使用iText在每页上添加总页码？通过快速网络搜索提醒自己这一点；看看 相关的方法有Java 如何使用iText在每页上添加总页码？,java,itext,Java,Itext,如何使用iText在每页上添加总页码？通过快速网络搜索提醒自己这一点；看看 相关的方法有onedpage（）生成“X”和onCloseDocument（）在到达文档末尾时生成“Y” 首先使用虚拟页面计数处理从PdfWriter到bytestream的输出 从该ByTestStream创建一个PdfReader，调用PdfReader.getNumberOfPages获取实际的页面计数 重新创建PDF输出，了解页数，并相应地更改页脚 这很混乱，但是如果没有两次通过的方法，就无法轻松地知道页面计数
onedpage（）onCloseDocument（）PdfWriterbytestreamByTestStreamPdfReaderPdfReader.getNumberOfPages这很混乱，但是如果没有两次通过的方法，就无法轻松地知道页面计数。有关操作PDF的详细信息，请参见。以下是我使用的代码。将页面写入输出不会增加太多开销
outputStream = new ByteArrayOutputStream();
output = new DataOutputStream(outputStream);
document = new Document();
writer = PdfWriter.getInstance(document, output);
document.open();
contentByte = writer.getDirectContent();
....add stuff
document.close();
writer.close();
byte[] output = outputStream.toByteArray();
PdfReader reader = new PdfReader(output);
//reset the output
outputStream = new ByteArrayOutputStream();
output = new DataOutputStream(outputStream);
document = new Document();
writer = PdfWriter.getInstance(document, output);
document.open();
PdfStamper stamper = new PdfStamper(reader, outputStream);
//add the pages
for (int i = 1; i <= pageCount; i++)
{
contentByte = stamper.getOverContent(i);
addParagraph("Page " + i + " of " + pageCount, new Point(500, 30), boldTextFont); // my own paragraph font
}
stamper.close();
outputStream=newbytearrayoutputstream（）；
输出=新数据输出流（outputStream）；
文件=新文件（）；
writer=PdfWriter.getInstance（文档，输出）；
document.open（）；
contentByte=writer.getDirectContent（）；
……添加内容
document.close（）；
writer.close（）；
字节[]输出=outputStream.toByteArray（）；
PdfReader读取器=新PdfReader（输出）；
//重置输出
outputStream=新的ByteArrayOutputStream（）；
输出=新数据输出流（outputStream）；
文件=新文件（）；
writer=PdfWriter.getInstance（文档，输出）；
document.open（）；
PdfStamper压模=新的PdfStamper（读卡器，输出流）；
//添加页面
对于（inti=1；i不再搜索，这里是解决方案。如果他们删除此链接，我将把代码发布到我的站点并托管此链接
您可以创建一个继承自PdfPageEventHelper
然后重写这两个函数，如下所示：
Imports System.Collections.Generic
Imports System.Text
Imports iTextSharp.text.pdf
Imports iTextSharp.text
Namespace PDF_EnteteEtPiedDePage
Public Class EnteteEtPiedDePage
Inherits PdfPageEventHelper
' This is the contentbyte object of the writer
Private cb As PdfContentByte
' we will put the final number of pages in a template
Private template As PdfTemplate
' this is the BaseFont we are going to use for the header / footer
Private bf As BaseFont = Nothing
' This keeps track of the creation time
Private PrintTime As DateTime = DateTime.Now
' we override the onOpenDocument method
Public Overrides Sub OnOpenDocument(writer As PdfWriter, document As Document)
Try
PrintTime = DateTime.Now
bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED)
cb = writer.DirectContent
template = cb.CreateTemplate(50, 50)
Catch de As DocumentException
Catch ioe As System.IO.IOException
End Try
End Sub
Public Overrides Sub OnStartPage(writer As PdfWriter, document As Document)
MyBase.OnStartPage(writer, document)
Dim pageSize As Rectangle = document.PageSize
End Sub
Public Overrides Sub OnEndPage(writer As PdfWriter, document As Document)
MyBase.OnEndPage(writer, document)
Dim pageN As Integer = writer.PageNumber
Dim text As [String] = "Page " & pageN & " de "
Dim len As Single = bf.GetWidthPoint(text, 8)
Dim pageSize As Rectangle = document.PageSize
cb.SetRGBColorFill(100, 100, 100)
cb.BeginText()
cb.SetFontAndSize(bf, 8)
cb.SetTextMatrix(pageSize.GetLeft(40), pageSize.GetBottom(30))
cb.ShowText(text)
cb.EndText()
cb.AddTemplate(template, pageSize.GetLeft(40) + len, pageSize.GetBottom(30))
cb.BeginText()
cb.SetFontAndSize(bf, 8)
cb.ShowTextAligned(PdfContentByte.ALIGN_RIGHT, "Imprimé le : " & PrintTime.ToShortDateString() & " à " & PrintTime.ToShortTimeString, pageSize.GetRight(40), pageSize.GetBottom(30), 0)
cb.EndText()
End Sub
Public Overrides Sub OnCloseDocument(writer As PdfWriter, document As Document)
MyBase.OnCloseDocument(writer, document)
template.BeginText()
template.SetFontAndSize(bf, 8)
template.SetTextMatrix(0, 0)
template.ShowText("" & Convert.ToString((writer.PageNumber - 1)))
template.EndText()
End Sub
End Class
End Namespace
Dim PageEventHandler = New EnteteEtPiedDePage()
aPdfWriter.PageEvent = PageEventHandler
然后，只需设置pdfwriter PageEvent
的值，如下所示：
Imports System.Collections.Generic
Imports System.Text
Imports iTextSharp.text.pdf
Imports iTextSharp.text
Namespace PDF_EnteteEtPiedDePage
Public Class EnteteEtPiedDePage
Inherits PdfPageEventHelper
' This is the contentbyte object of the writer
Private cb As PdfContentByte
' we will put the final number of pages in a template
Private template As PdfTemplate
' this is the BaseFont we are going to use for the header / footer
Private bf As BaseFont = Nothing
' This keeps track of the creation time
Private PrintTime As DateTime = DateTime.Now
' we override the onOpenDocument method
Public Overrides Sub OnOpenDocument(writer As PdfWriter, document As Document)
Try
PrintTime = DateTime.Now
bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED)
cb = writer.DirectContent
template = cb.CreateTemplate(50, 50)
Catch de As DocumentException
Catch ioe As System.IO.IOException
End Try
End Sub
Public Overrides Sub OnStartPage(writer As PdfWriter, document As Document)
MyBase.OnStartPage(writer, document)
Dim pageSize As Rectangle = document.PageSize
End Sub
Public Overrides Sub OnEndPage(writer As PdfWriter, document As Document)
MyBase.OnEndPage(writer, document)
Dim pageN As Integer = writer.PageNumber
Dim text As [String] = "Page " & pageN & " de "
Dim len As Single = bf.GetWidthPoint(text, 8)
Dim pageSize As Rectangle = document.PageSize
cb.SetRGBColorFill(100, 100, 100)
cb.BeginText()
cb.SetFontAndSize(bf, 8)
cb.SetTextMatrix(pageSize.GetLeft(40), pageSize.GetBottom(30))
cb.ShowText(text)
cb.EndText()
cb.AddTemplate(template, pageSize.GetLeft(40) + len, pageSize.GetBottom(30))
cb.BeginText()
cb.SetFontAndSize(bf, 8)
cb.ShowTextAligned(PdfContentByte.ALIGN_RIGHT, "Imprimé le : " & PrintTime.ToShortDateString() & " à " & PrintTime.ToShortTimeString, pageSize.GetRight(40), pageSize.GetBottom(30), 0)
cb.EndText()
End Sub
Public Overrides Sub OnCloseDocument(writer As PdfWriter, document As Document)
MyBase.OnCloseDocument(writer, document)
template.BeginText()
template.SetFontAndSize(bf, 8)
template.SetTextMatrix(0, 0)
template.ShowText("" & Convert.ToString((writer.PageNumber - 1)))
template.EndText()
End Sub
End Class
End Namespace
Dim PageEventHandler = New EnteteEtPiedDePage()
aPdfWriter.PageEvent = PageEventHandler
试试这个，因为我也受到了这个问题的困扰，而且我还新建了这个库，所以在经历了很多麻烦之后，我得到了结果，只是像我在评论中提到的那样，尝试两次应用逻辑
class PdfReportServlet extends HttpServlet
{
public static int total = 0;
public static int getTotal()
{
return total;
}
public static void setTotal(int total) {
PdfReportServlet .total = total;
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String reportFor = request.getParameter("report");
if(!"".equals(reportFor))
{
if(reportFor.equals("pdf"))
{
/*
from here logic starts
*/
response.setContentType("application/pdf");
Document document = new Document(PageSize.LETTER.rotate());
try
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PdfWriter pdfWriter = PdfWriter.getInstance(document, bos);
PdfReport pdfReport = new PdfReport();
pdfWriter.setPageEvent(pdfReport);
document.open();
String id = request.getParameter("id");
DettagliFamigliaPDFReport.generatePDFReport(document,id);
document.close();
/*
* now again give new references to Document and PdfWriter classes.
*/
document = new Document(PageSize.LETTER.rotate());
pdfWriter = PdfWriter.getInstance(document, response.getOutputStream());
PDFReport.setTotalPages(getTotal());/*##PAGES_TOTAL here i set total Pages which i get from above logic */
PdfReport pdfReport = new PdfReport();
pdfWriter.setPageEvent(pdfReport);
document.open();
id = request.getParameter("id");
PDFReport.generatePDFReport(document,id);
document.close();
}
catch(DocumentException de){
de.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
/*
Here below i write the class inherits the PdfPageEventHelper class and also having generatePDFReport() method.
*/
public class PDFReport extends PdfPageEventHelper
{
public static PdfTemplate template;
public static int totalPages=0;
public static int getTotalPages() {
return totalPages;
}
public static void setTotalPages(int totalPages) {
DettagliFamigliaPDFReport.totalPages = totalPages;
}
public static void generatePDFReport(Document document,String id)
{
// here your data to write on page of pdf.
}
@Override
public void onOpenDocument(PdfWriter writer, Document doc)
{
template = writer.getDirectContent().createTemplate(100, 100);
}
int totalPage = 0;
@Override
public void onCloseDocument(PdfWriter writer, Document doc)
{
totalPage = writer.getPageNumber() - 1;/* at the end this method calls and you will get total number of pages.*/
PdfReportServlet.setTotal(totalPage); /* while first time logic of servlet executes then i set the total pages to servlet's variable using this logic.
and second time servlet's logic is executing i passed totalPages to this class variable
where i marked ##PAGES_TOTAL */
}
@Override
public void onStartPage(PdfWriter writer, Document doc) {
// Here i write header logic when each time page starts.
}
@Override`enter code here`
public void onEndPage(PdfWriter writer, Document doc)
{
Rectangle rect = writer.getPageSize();
float width = rect.getWidth()/2;
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
Date date = new Date();
String footerOne = "This document is printed on date "+dateFormat.format(date)+" - Page. "+writer.getPageNumber()+" of "+getTotalPages();
Paragraph paraOne = new Paragraph(footerOne);
Font fontFooter = new Font();
fontFooter.setSize(8);
fontFooter.setColor(Color.gray);
paraOne.setFont(fontFooter);
Phrase footerPhraseOne = new Phrase(paraOne);
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_CENTER, footerPhraseOne,
width, 30, 0);
}
}
这是一个方便的函数！（基于Milhous的方法）（使用itext版本4.1.6.0）
公共静态字节[]addPageNumber（字节[]pdf）
{
PdfReader reader=新PdfReader（pdf）；
var Pages=reader.NumberOfPages；
MemoryStream ms=新的MemoryStream（）；
PdfStamper压模=新PdfStamper（读卡器，毫秒）；
对于（inti=1；i，这是您的代码片段：
final PdfWriter writer = PdfWriter.getInstance(document, outputStream);
writer.setPageEvent(new PageStamper());
以及编号代码：
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import com.itextpdf.tool.xml.*;
import com.itextpdf.tool.xml.css.*;
import java.io.IOException;
/**
* Adds page number to al the pages except the first.
*/
public class PageStamper extends PdfPageEventHelper {
private static final Logger logger = Logger.getLogger(PageStamper.class);
@Override
public void onEndPage(PdfWriter writer, Document document) {
final int currentPageNumber = writer.getCurrentPageNumber();
if (currentPageNumber == 1) {
return;
}
try {
final Rectangle pageSize = document.getPageSize();
final PdfContentByte directContent = writer.getDirectContent();
directContent.setColorFill(BaseColor.GRAY);
directContent.setFontAndSize(BaseFont.createFont(), 10);
directContent.setTextMatrix(pageSize.getRight(40), pageSize.getBottom(30));
directContent.showText(String.valueOf(currentPageNumber));
} catch (DocumentException | IOException e) {
logger.error("PDF generation error", e);
}
}
}
此处找到此代码：。非常感谢，Y722正如其他答案所示，您首先需要创建pdf，然后查看您创建的pdf包含多少页面，然后将页脚添加到每个页面。
理想的类是PdfStamper，其目的是向现有pdf/现有pdf页面添加其他元素
下面是一个基于米尔豪斯的详细示例：
Font smallFont = FontFactory.getFont("Arial", 9, Font.NORMAL);
ByteArrayOutputStream pdfOutputStream = new ByteArrayOutputStream();
Document document = new Document(PageSize.A4, 70, 70, 40, 40);
PdfWriter pdfWriter = PdfWriter.getInstance(document, pdfOutputStream);
document.open();
//CREATE PDF HERE - ADD CONTENT TO DOCUMENT
document.close();
int pageCount = pdfWriter.getPageNumber()-1;
byte[] pdfAsBytes = pdfOutputStream.toByteArray();
//add footer
PdfReader reader = new PdfReader(pdfAsBytes);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
DataOutputStream output = new DataOutputStream(outputStream);
document = new Document();
document.open();
PdfStamper stamper = new PdfStamper(reader, output);
for (int i = 1; i <= pageCount; i++) {
ColumnText.showTextAligned(stamper.getOverContent(i),
Element.ALIGN_CENTER, new Phrase(i+"/" + pageCount, smallFont), 550, 30, 0);
}
stamper.close();
byte[] finalPdfAsBytes = outputStream.toByteArray();
Font smallFont=FontFactory.getFont（“Arial”，9，Font.NORMAL）；
ByteArrayOutputStream pdfOutputStream=新建ByteArrayOutputStream（）；
文件=新文件（PageSize.A4、70、70、40、40）；
PdfWriter PdfWriter=PdfWriter.getInstance（文档，pdfOutputStream）；
document.open（）；
//在此处创建PDF-将内容添加到文档
document.close（）；
int pageCount=pdfWriter.getPageNumber（）-1；
byte[]pdfAsBytes=pdfOutputStream.toByteArray（）；
//添加页脚
PdfReader reader=新PdfReader（PDFAS字节）；
ByteArrayOutputStream outputStream=新建ByteArrayOutputStream（）；
DataOutputStream输出=新的DataOutputStream（outputStream）；
文件=新文件（）；
document.open（）；
PdfStamper压模=新PdfStamper（读卡器，输出）；
对于（inti=1；i这是用Java转换的Rama代码（至少是其中的一部分）
经过两天的努力，我终于得到了PDF中的总页数。
实际上，我的客户要求只在PDF的最后一页显示页脚。
我就是这样做的，希望将来能对别人有所帮助。
步骤1：
创建新类，该类将继承自PdfPageEventHelper，如下所示
public class ITextEvents : PdfPageEventHelper
{
public int pageNos { get; set; }
/// <summary>
/// CALLED ON EACH PAGE END PAGE,
/// </summary>
/// <param name="writer"></param>
/// <param name="document"></param>
public override void OnEndPage(iTextSharp.text.pdf.PdfWriter writer, iTextSharp.text.Document document)
{
//LOGIC: TO SHOW DISCLAIMER ONLY ON LAST PAGE
if (document.PageNumber == pageNos)
{
//Create new Paragraph
Paragraph p = new Paragraph();
//ADD CHUNK IN PARAGRAPH
p.Add(new Chunk("Heading-Text: ", FontFactory.GetFont("Calibri",11,Font.BOLD)));
p.Add(new Chunk("Details sow in footer", FontFactory.GetFont("Calibri", 10)));
//PARAGRAPH TEXT ALIGNMENT.
p.Alignment = Element.ALIGN_LEFT;
//CREATE PDF TABLE, FOR ADDING NEW CELL AND ROW IN THE PDF
PdfPTable footerTbl = new PdfPTable(1);
//SETING TABLE WIDTH
footerTbl.TotalWidth = 580;
footerTbl.HorizontalAlignment = Element.ALIGN_LEFT;
//ADDING CELL IN THE TABLE
PdfPCell cell = new PdfPCell(p);
//CELL LAYOUT DESIGN
cell.Border = 1;
cell.PaddingLeft = 10;
cell.PaddingRight = 10;
footerTbl.AddCell(cell);
//ADDING TABLE IN THE PDF
footerTbl.WriteSelectedRows(0, -1, 10, 110, writer.DirectContent);
}
}
/// <summary>
/// THIS METHOD WILL GET TOTAL PDF PAGES COUNT,
/// REQUIREMENT OF THIS METHOD WAS IS TO SHOW FOOTER ON LAST PAGE IN THE PDF.
/// </summary>
/// <param name="HistoryHTML"></param>
/// <param name="Name"></param>
/// <param name="filePath"></param>
/// <returns></returns>
public int GetTotalPageCount(string HistoryHTML, String Name, string filePath)
{
try
{
using (MemoryStream stream = new System.IO.MemoryStream())
{
StringReader sr = new StringReader(HistoryHTML);
Document pdfDoc = new Document(PageSize.A4, 30f, 30f, 30f, 90f);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, stream);
pdfDoc.Open();
XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
pdfDoc.Close();
bool exists = System.IO.Directory.Exists(filePath);
if (!exists)
System.IO.Directory.CreateDirectory(filePath);
System.IO.File.WriteAllBytes((filePath + @"\FileName-" + Name + ".pdf"), stream.ToArray());
string path = AppDomain.CurrentDomain.BaseDirectory + @"FolderPath\" + "FileName-" + Name + ".pdf";
PdfReader pdfReader = new PdfReader(path);
int numberOfPages = pdfReader.NumberOfPages;
pdfReader.Close();
stream.Close();
return numberOfPages;
}
}
catch (Exception ex)
{
CommonFunction.logElmahError(ex);
}
return -1;
}
}
为了更好地理解，我提供了控制器端代码
public string ExportPDF(string HistoryHTML, String Name)
{
int pageCount = new Common.ITextEvents().GetTotalPageCount(HistoryHTML, Name, Server.MapPath("~/FolderPath"));
using (MemoryStream stream = new System.IO.MemoryStream())
{
StringReader sr = new StringReader(HistoryHTML);
Document pdfDoc = new Document(PageSize.A4, 30f, 30f, 30f, 30f);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, stream);
pdfDoc.Open();
//APPEND DISCLAIMER TEXT ACCORING TO HIPAA RULES.
writer.PageEvent = new Common.ITextEvents() { pageNo = pageCount };
XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
pdfDoc.Close();
bool exists = System.IO.Directory.Exists(Server.MapPath("~/FolderPath"));
if (!exists)
System.IO.Directory.CreateDirectory(Server.MapPath("~/FolderPath"));
System.IO.File.WriteAllBytes(Server.MapPath("~/FolderPath/" + Name + ".pdf"), stream.ToArray());
return File(stream.ToArray(), "application/pdf", "FileName-" + Name + "-" + Name + ".pdf");
}
}
似乎是首选的方式。但是计算出的'adjust'变量有一个问题：它只针对一个字符计算：'helv.getWidthPoint（“0”，12）”：-（示例不再可用，它确实很难看。但这也是使用iText的唯一方式。如果有人知道更好的Java PDF库（最好是免费的/OSS），我很想知道。对于使用PDF reader，文档必须关闭，否则它会给出PDF页眉也不例外。因此，在每个页脚中使用它，文档需要打开以写入每个页脚。以防万一：很好，他们实际上删除了链接，并且您能够预测它：-）当你添加页面时，你要数一数。@Milhous你能解释一下：addparagration（“Page”+i+”of“+pageCount，new Point（500，30），boldTextFont）；//我自己的段落字体从哪里来的？错误的示例代码。如果你不一次添加页面也没有帮助。一点用处都没有。这不是java代码，问题被标记为[java]。无论如何，这很有帮助。我将其转换为java，但它对我不起作用。：（@pinch我如何调用此方法以及在何处？@Rama如果您愿意，您可以将此代码添加到您的响应中。如果您这样做，请阻止我。“实际上，我的客户要求仅在PDF的最后一页显示页脚”那么你根本不需要页面事件。只需在所有其他内容完成后绘制页脚即可。
public string ExportPDF(string HistoryHTML, String Name)
{
int pageCount = new Common.ITextEvents().GetTotalPageCount(HistoryHTML, Name, Server.MapPath("~/FolderPath"));
using (MemoryStream stream = new System.IO.MemoryStream())
{
StringReader sr = new StringReader(HistoryHTML);
Document pdfDoc = new Document(PageSize.A4, 30f, 30f, 30f, 30f);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, stream);
pdfDoc.Open();
//APPEND DISCLAIMER TEXT ACCORING TO HIPAA RULES.
writer.PageEvent = new Common.ITextEvents() { pageNo = pageCount };
XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
pdfDoc.Close();
bool exists = System.IO.Directory.Exists(Server.MapPath("~/FolderPath"));
if (!exists)
System.IO.Directory.CreateDirectory(Server.MapPath("~/FolderPath"));
System.IO.File.WriteAllBytes(Server.MapPath("~/FolderPath/" + Name + ".pdf"), stream.ToArray());
return File(stream.ToArray(), "application/pdf", "FileName-" + Name + "-" + Name + ".pdf");
}
}