java 如何在使用 itextpdf 生成 pdf 文件时制作页脚
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How to make a footer in generating a pdf file using an itextpdf
提问by Weddy
I have been searching the net on how to make or set a footer using itextpdf in java. and up until now i havent found anything on how to do it. I have seen some articles on how to use and set a header. but not footers. here's a sample code
我一直在网上搜索如何使用 java 中的 itextpdf 制作或设置页脚。直到现在我还没有找到任何关于如何做到这一点的信息。我看过一些关于如何使用和设置标题的文章。但不是页脚。这是一个示例代码
Document document = new Document(PageSize.LETTER);
Paragraph here = new Paragraph();
Paragraph there = new Paragraph();
Font Font1 = new Font(Font.FontFamily.HELVETICA, 9, Font.BOLD);
here.add(new Paragraph("sample here", Font1));
there.add(new Paragraph("sample there", Font1));
//footer here
document.add(here);
document.add(there);
document.add(footer);
回答by Pranav Kumar
For implementing Header and footer you need to implement a HeaderFooter class that extends
PdfPageEventHelper class of iText API. Then override the onEndPage()to set header and footer. In this example I am settingnamein header and 'page mumber` in footer.
为了实现页眉和页脚，您需要实现一个 HeaderFooter 类，该类扩展
了 iText API 的 PdfPageEventHelper 类。然后覆盖onEndPage()设置页眉和页脚。在这个例子中，我name在页眉中设置，在页脚中设置“页面编号”。
In pdf creation side code you need to use HeaderAndFooterclass like this:
在 pdf 创建端代码中，您需要使用这样的HeaderAndFooter类：
Document document = new Document(PageSize.LETTER);
PdfWriter writer = PdfWriter.getInstance(document, "C:\sample.pdf");
//set page event to PdfWriter instance that you use to prepare pdf
writer.setPageEvent(new HeaderAndFooter(name));
.... //Add your content to documne here and close the document at last
/*
* HeaderAndFooter class
*/
public class HeaderAndFooter extends PdfPageEventHelper {
private String name = "";
protected Phrase footer;
protected Phrase header;
/*
* Font for header and footer part.
*/
private static Font headerFont = new Font(Font.COURIER, 9,
Font.NORMAL,Color.blue);
private static Font footerFont = new Font(Font.TIMES_ROMAN, 9,
Font.BOLD,Color.blue);
/*
* constructor
*/
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();
//header content
String headerContent = "Name: " +name;
//header content
String footerContent = headerContent;
/*
* Header
*/
ColumnText.showTextAligned(cb, Element.ALIGN_LEFT, new Phrase(headerContent,headerFont),
document.leftMargin() - 1, document.top() + 30, 0);
/*
* Foooter
*/
ColumnText.showTextAligned(cb, Element.ALIGN_RIGHT, new Phrase(String.format(" %d ",
writer.getPageNumber()),footerFont),
document.right() - 2 , document.bottom() - 20, 0);
}
}
Hope it helps. I had used this in one of the allication.
希望能帮助到你。我曾在其中一个联盟中使用过它。
