如何使用itextpdf生成PDF文件的頁腳

Question

我一直在使用java中的itextpdf在網上搜索如何製作或設置頁腳。直到現在，我還沒有找到關於如何去做的任何事情。我看過一些關於如何使用和設置標題的文章。但不是頁腳。這裏是一個示例代碼

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); 

Answer 1

爲了實現頁眉和頁腳您需要實現擴展
PdfPageEventHelper類的iText API的類的HeaderFooter。然後覆蓋onEndPage()設置頁眉和頁腳。在這個例子中，我在頁眉中設置了name，在頁腳中設置了「頁面數量」。

在創建PDF端代碼，你需要使用HeaderAndFooter類是這樣的：

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); 

    } 

} 

希望它能幫助。我已經在一個通用中使用了它。