问题
I have created a PDF file dynamically using iText Library, Now I want to add Header and Footer in PDF's pages, for this one I have added given code:
document.addHeader("My Header Title", "My Header Details");
But in my PDF's pages this header couldn't set. What is issue that I don't know, If you have any idea related to it,please share your thoughts.
回答1:
In case you use a current iText version (i.e. 5.4.x as of now) have a look at the sample MovieHistory2 from iText in Action — 2nd Edition which shows how to add headers (different ones for odd and even pages) to a PDF while creating it.
Most essential is a PdfPageEventHelper implementation
/** Inner class to add a header and a footer. */
class HeaderFooter extends PdfPageEventHelper {
/** Alternating phrase for the header. */
Phrase[] header = new Phrase[2];
/** Current page number (will be reset for every chapter). */
int pagenumber;
/**
* Initialize one of the headers.
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(
* com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onOpenDocument(PdfWriter writer, Document document) {
header[0] = new Phrase("Movie history");
}
/**
* Initialize one of the headers, based on the chapter title;
* reset the page number.
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onChapter(
* com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document, float,
* com.itextpdf.text.Paragraph)
*/
public void onChapter(PdfWriter writer, Document document,
float paragraphPosition, Paragraph title) {
header[1] = new Phrase(title.getContent());
pagenumber = 1;
}
/**
* Increase the page number.
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onStartPage(
* com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onStartPage(PdfWriter writer, Document document) {
pagenumber++;
}
/**
* Adds the header and the footer.
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(
* com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onEndPage(PdfWriter writer, Document document) {
Rectangle rect = writer.getBoxSize("art");
switch(writer.getPageNumber() % 2) {
case 0:
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_RIGHT, header[0],
rect.getRight(), rect.getTop(), 0);
break;
case 1:
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_LEFT, header[1],
rect.getLeft(), rect.getTop(), 0);
break;
}
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_CENTER, new Phrase(String.format("page %d", pagenumber)),
(rect.getLeft() + rect.getRight()) / 2, rect.getBottom() - 18, 0);
}
}
which is registered like this:
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
HeaderFooter event = new HeaderFooter();
writer.setBoxSize("art", new Rectangle(36, 54, 559, 788));
writer.setPageEvent(event);
EDIT: As requested in the comments, a simpler variant of the onEndPage method with a static header instead of the alternating one:
public void onEndPage(PdfWriter writer, Document document)
{
Rectangle rect = writer.getBoxSize("art");
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_RIGHT, new Phrase("My static header text"),
rect.getRight(), rect.getTop(), 0);
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_CENTER, new Phrase(String.format("page %d", pagenumber)),
(rect.getLeft() + rect.getRight()) / 2, rect.getBottom() - 18, 0);
}
回答2:
please refer this site.......
https://www.coderanch.com/how-to/java/ItextExample
回答3:
Please first refer to the accepted answer of this question.
That answer is very helpful (and It helped me to).
Just in case you are programming in C#, here is the SAME accepted answer but in C# version
/// <summary>
/// Inner class to add a header and a footer.
/// </summary>
internal class HeaderFooter : PdfPageEventHelper
{
private Phrase[] header = new Phrase[2];
private int pageNumber;
public override void OnOpenDocument(PdfWriter writer, Document document)
{
header[0] = new Phrase("Smares in Header");
}
public override void OnChapter(PdfWriter writer, Document document, float paragraphPosition, Paragraph title)
{
header[1] = new Phrase(title.Content);
pageNumber = 1;
}
public override void OnStartPage(PdfWriter writer, Document document)
{
pageNumber++;
}
public override void OnEndPage(PdfWriter writer, Document document)
{
Rectangle rect = writer.GetBoxSize("art");
switch (writer.PageNumber % 2)
{
case 0:
ColumnText.ShowTextAligned(writer.DirectContent,
Element.ALIGN_RIGHT, header[0],
rect.Right, rect.Top, 0);
break;
case 1:
ColumnText.ShowTextAligned(writer.DirectContent,
Element.ALIGN_LEFT, header[1],
rect.Left, rect.Top, 0);
break;
}
ColumnText.ShowTextAligned(writer.DirectContent,
Element.ALIGN_CENTER, new Phrase(String.Format("page {0}", pageNumber)),
(rect.Left + rect.Right) / 2, rect.Bottom - 18, 0);
}
}
and the registration of the event will be :
using (MemoryStream ms = new MemoryStream())
{
using (Document doc = new Document(PageSize.A4, -30, -30, 45, 45))
{
using (PdfWriter writer = PdfWriter.GetInstance(doc, ms))
{
HeaderFooter ev = new HeaderFooter();
writer.SetBoxSize("art", new Rectangle(36, 54, 559, 788));
writer.PageEvent = ev;
// continue your code here
}
}
}
NOTE : this is just a conversion of the accepted answer from java to C#. but you can customize this according to your needs, as I did with it.
回答4:
You can add like that
HeaderFooter header = new HeaderFooter(new Phrase("Add Header Part Here"), false);
HeaderFooter footer = new HeaderFooter(new Phrase("Add Footer Here"), new Phrase("."));
document.setHeader(header);
document.setFooter(footer);
来源：https://stackoverflow.com/questions/17214756/how-to-add-header-and-footer-in-dynamic-pdf-using-itextlibrary