itext给已有pdf添加页眉页脚

网上百度到的基本都是生成pdf的时候,添加页眉页脚,但是假如对已有的pdf添加页眉页脚就比较麻烦,突然想到了可以曲线救国,用itext进行复制pdf的时候,在添加页眉页脚,最后可以成功的。

生成pdf的代码忘记参考谁的了。。。。

生成Pdf的代码如下:

/**
 * @author WGR
 * @create 2020/8/18 -- 15:57
 */
public class PdfReport {
    // main测试
    public static void main(String[] args) throws Exception {
        try {
            // 1.新建document对象
            Document document = new Document(PageSize.A4);// 建立一个Document对象

            // 2.建立一个书写器(Writer)与document对象关联
            File file = new File("D:\PDFDemo.pdf");
           // file.createNewFile();
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
        //    writer.setPageEvent(new Watermark("HELLO ITEXTPDF"));// 水印
       //   writer.setPageEvent(new MyHeaderFooter());// 页眉/页脚

//            // 3.打开文档
            document.open();
            document.addTitle("Title@PDF-Java");// 标题
            document.addAuthor("Author@umiz");// 作者
            document.addSubject("Subject@iText pdf sample");// 主题
            document.addKeywords("Keywords@iTextpdf");// 关键字
            document.addCreator("Creator@umiz`s");// 创建者

            // 4.向文档中添加内容
            new PdfReport().generatePDF(document);

            // 5.关闭文档
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 定义全局的字体静态变量
    private static Font titlefont;
    private static Font headfont;
    private static Font keyfont;
    private static Font textfont;
    // 最大宽度
    private static int maxWidth = 520;
    // 静态代码块
    static {
        try {
            // 不同字体(这里定义为同一种字体:包含不同字号、不同style)
            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            titlefont = new Font(bfChinese, 16, Font.BOLD);
            headfont = new Font(bfChinese, 14, Font.BOLD);
            keyfont = new Font(bfChinese, 10, Font.BOLD);
            textfont = new Font(bfChinese, 10, Font.NORMAL);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 生成PDF文件
    public void generatePDF(Document document) throws Exception {

        // 段落
        Paragraph paragraph = new Paragraph("美好的一天从早起开始!", titlefont);
        paragraph.setAlignment(1); //设置文字居中 0靠左   1,居中     2,靠右
        paragraph.setIndentationLeft(12); //设置左缩进
        paragraph.setIndentationRight(12); //设置右缩进
        paragraph.setFirstLineIndent(24); //设置首行缩进
        paragraph.setLeading(20f); //行间距
        paragraph.setSpacingBefore(5f); //设置段落上空白
        paragraph.setSpacingAfter(10f); //设置段落下空白

        // 直线
        Paragraph p1 = new Paragraph();
        p1.add(new Chunk(new LineSeparator()));

        // 点线
        Paragraph p2 = new Paragraph();
        p2.add(new Chunk(new DottedLineSeparator()));

        // 超链接
        Anchor anchor = new Anchor("baidu");
        anchor.setReference("www.baidu.com");

        // 定位
        Anchor gotoP = new Anchor("goto");
        gotoP.setReference("#top");

        // 添加图片
        Image image = Image.getInstance("C:\Users\asus\Desktop\123.jpg");
        image.setAlignment(Image.ALIGN_CENTER);
        image.scalePercent(40); //依照比例缩放

        // 表格
        PdfPTable table = createTable(new float[] { 40, 120, 120, 120, 80, 80 });
        table.addCell(createCell("美好的一天", headfont, Element.ALIGN_LEFT, 6, false));
        table.addCell(createCell("早上9:00", keyfont, Element.ALIGN_CENTER));
        table.addCell(createCell("中午11:00", keyfont, Element.ALIGN_CENTER));
        table.addCell(createCell("中午13:00", keyfont, Element.ALIGN_CENTER));
        table.addCell(createCell("下午15:00", keyfont, Element.ALIGN_CENTER));
        table.addCell(createCell("下午17:00", keyfont, Element.ALIGN_CENTER));
        table.addCell(createCell("晚上19:00", keyfont, Element.ALIGN_CENTER));
        Integer totalQuantity = 0;
        for (int i = 0; i < 5; i++) {
            table.addCell(createCell("起床1", textfont));
            table.addCell(createCell("吃午饭1", textfont));
            table.addCell(createCell("午休1", textfont));
            table.addCell(createCell("下午茶", textfont));
            table.addCell(createCell("回家", textfont));
            table.addCell(createCell("吃晚饭", textfont));
            totalQuantity ++;
        }
        table.addCell(createCell("总计", keyfont));
        table.addCell(createCell("", textfont));
        table.addCell(createCell("", textfont));
        table.addCell(createCell("", textfont));
        table.addCell(createCell(String.valueOf(totalQuantity) + "件事", textfont));
        table.addCell(createCell("", textfont));

        document.add(paragraph);
        document.add(anchor);
        document.add(p2);
        document.add(gotoP);
        document.add(p1);
        document.add(table);
        document.add(image);
    }


/**------------------------创建表格单元格的方法start----------------------------*/
    /**
     * 创建单元格(指定字体)
     * @param value
     * @param font
     * @return
     */
    public PdfPCell createCell(String value, Font font) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }
    /**
     * 创建单元格(指定字体、水平..)
     * @param value
     * @param font
     * @param align
     * @return
     */
    public PdfPCell createCell(String value, Font font, int align) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }
    /**
     * 创建单元格(指定字体、水平居..、单元格跨x列合并)
     * @param value
     * @param font
     * @param align
     * @param colspan
     * @return
     */
    public PdfPCell createCell(String value, Font font, int align, int colspan) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setColspan(colspan);
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }
    /**
     * 创建单元格(指定字体、水平居..、单元格跨x列合并、设置单元格内边距)
     * @param value
     * @param font
     * @param align
     * @param colspan
     * @param boderFlag
     * @return
     */
    public PdfPCell createCell(String value, Font font, int align, int colspan, boolean boderFlag) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setColspan(colspan);
        cell.setPhrase(new Phrase(value, font));
        cell.setPadding(3.0f);
        if (!boderFlag) {
            cell.setBorder(0);
            cell.setPaddingTop(15.0f);
            cell.setPaddingBottom(8.0f);
        } else if (boderFlag) {
            cell.setBorder(0);
            cell.setPaddingTop(0.0f);
            cell.setPaddingBottom(15.0f);
        }
        return cell;
    }
    /**
     * 创建单元格(指定字体、水平..、边框宽度:0表示无边框、内边距)
     * @param value
     * @param font
     * @param align
     * @param borderWidth
     * @param paddingSize
     * @param flag
     * @return
     */
    public PdfPCell createCell(String value, Font font, int align, float[] borderWidth, float[] paddingSize, boolean flag) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setPhrase(new Phrase(value, font));
        cell.setBorderWidthLeft(borderWidth[0]);
        cell.setBorderWidthRight(borderWidth[1]);
        cell.setBorderWidthTop(borderWidth[2]);
        cell.setBorderWidthBottom(borderWidth[3]);
        cell.setPaddingTop(paddingSize[0]);
        cell.setPaddingBottom(paddingSize[1]);
        if (flag) {
            cell.setColspan(2);
        }
        return cell;
    }
/**------------------------创建表格单元格的方法end----------------------------*/


/**--------------------------创建表格的方法start------------------- ---------*/
    /**
     * 创建默认列宽,指定列数、水平(居中、右、左)的表格
     * @param colNumber
     * @param align
     * @return
     */
    public PdfPTable createTable(int colNumber, int align) {
        PdfPTable table = new PdfPTable(colNumber);
        try {
            table.setTotalWidth(maxWidth);
            table.setLockedWidth(true);
            table.setHorizontalAlignment(align);
            table.getDefaultCell().setBorder(1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return table;
    }
    /**
     * 创建指定列宽、列数的表格
     * @param widths
     * @return
     */
    public PdfPTable createTable(float[] widths) {
        PdfPTable table = new PdfPTable(widths);
        try {
            table.setTotalWidth(maxWidth);
            table.setLockedWidth(true);
            table.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.getDefaultCell().setBorder(1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return table;
    }
    /**
     * 创建空白的表格
     * @return
     */
    public PdfPTable createBlankTable() {
        PdfPTable table = new PdfPTable(1);
        table.getDefaultCell().setBorder(0);
        table.addCell(createCell("", keyfont));
        table.setSpacingAfter(20.0f);
        table.setSpacingBefore(20.0f);
        return table;
    }
/**--------------------------创建表格的方法end------------------- ---------*/

}

添加页眉页脚的类

/**
 * @author WGR
 * @create 2020/8/18 -- 15:59
 */
public class MyHeaderFooter extends PdfPageEventHelper {
    // 总页数
    PdfTemplate totalPage;
    Font hfFont;
    {
        try {
            hfFont = new Font(BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED), 8, Font.NORMAL);
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 打开文档时,创建一个总页数的模版
    @Override
    public void onOpenDocument(PdfWriter writer, Document document) {
        PdfContentByte cb =writer.getDirectContent();
        totalPage = cb.createTemplate(30, 16);
    }
    // 一页加载完成触发,写入页眉和页脚
    @Override
    public void onEndPage(PdfWriter writer, Document document) {
        PdfContentByte cb =writer.getDirectContent();
        totalPage = cb.createTemplate(30, 16);
        PdfPTable table = new PdfPTable(3);
        try {
            table.setTotalWidth(PageSize.A4.getWidth() - 100);
            table.setWidths(new int[] { 24, 24, 3});
            table.setLockedWidth(true);
            table.getDefaultCell().setFixedHeight(-10);
            table.getDefaultCell().setBorder(Rectangle.BOTTOM);

            table.addCell(new Paragraph("我是页眉/页脚", hfFont));// 可以直接使用addCell(str),不过不能指定字体,中文无法显示
            table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
            table.addCell(new Paragraph("第" + writer.getPageNumber() + "页/", hfFont));
            // 总页数
            PdfPCell cell = new PdfPCell(Image.getInstance(totalPage));
            cell.setBorder(Rectangle.BOTTOM);
            table.addCell(cell);
            // 将页眉写到document中,位置可以指定,指定到下面就是页脚
            table.writeSelectedRows(0, -1, 50, PageSize.A4.getHeight() - 20, writer.getDirectContent());
        } catch (Exception de) {
            throw new ExceptionConverter(de);
        }
    }

    // 全部完成后,将总页数的pdf模版写到指定位置
    @Override
    public void onCloseDocument(PdfWriter writer, Document document) {
        String text = "总" + (writer.getPageNumber()) + "页";
        ColumnText.showTextAligned(totalPage, Element.ALIGN_LEFT, new Paragraph(text,hfFont), 2, 2, 0);
    }

}

如果想指定页眉为图片的可以用:

class PdfHeaderFooter extends PdfPageEventHelper {
    Font bfChinese;
    int fontSize = 10;
    Image image;

    @Override
    public void onOpenDocument(PdfWriter writer, Document document) {
        try {
            bfChinese = new Font(BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED), fontSize, Font.NORMAL, BaseColor.GRAY);
            image = Image.getInstance(PDFUtil.class.getResource("/template/small.png"));
            image.scalePercent(50);
            image.setAbsolutePosition(8, document.top());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void onEndPage(PdfWriter writer, Document document) {
        try {
            Rectangle rect = new Rectangle(0, 38, 50, 50);

            String line1 = String.format("- %d -", writer.getPageNumber());
            ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_CENTER,
                    new Phrase(line1, bfChinese),
                    (document.rightMargin() + document.right() + document.leftMargin() - document.left() - bfChinese.getBaseFont().getWidthPoint(line1, fontSize) / 2) / 2.0F,
                    document.bottom() - 22,
                    0);
            String line2 = "本文件保密,未经允许,不得向任何第三方提供。";

            ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_CENTER,
                    new Phrase(line2, bfChinese),
                    (document.rightMargin() + document.right() + document.leftMargin() - document.left()) / 2.0F,
                    document.bottom() - 32,
                    0);
            writer.getDirectContent().addImage(image);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }


}

最终要的就是下面的方法:

    public static void main(String[] args) throws DocumentException, IOException {
        // Create output PDF
        Document document = new Document(PageSize.A4);
        File file = new File("D:\PDFDemo1.pdf");
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
        document.open();
        PdfContentByte cb = writer.getDirectContent();
        writer.setPageEvent(new MyHeaderFooter());// 页眉/页脚

// Load existing PDF
        File file2 = new File("D:\PDFDemo.pdf");
        PdfReader reader = new PdfReader(new FileInputStream(file2));
        PdfImportedPage page = writer.getImportedPage(reader, 1);

// Copy first page of existing PDF into output PDF
        document.newPage();
        cb.addTemplate(page, 0, 0);

// Add your new data / text here
// for example...
//        document.addKeywords("Keywords@iTextpdf");// 关键字
//        document.addCreator("Creator@umiz`s");// 创建者
//        document.add(new Paragraph("my timestamp"));

        document.close();
    }

这个只是一页的,假如多页,可以获取源pdf的页面进行for循环就可以了。

原文地址:https://www.cnblogs.com/dalianpai/p/13530480.html