• iText实战--Table、cell 和 page event

    5.1 使用表和单元格事件装饰表

    实现PdfPTableEvent 接口

    实现PdfPCellEvent 接口

    合并表格和单元格事件

    5.2 基本构建块的事件

    通用块（Chunk）功能

    段落（Paragraph）事件

    章节（Chapter）和 区域（Section）事件

    页面顺序和空白页面

    5.3 页面边界概述

    媒体盒

    作物箱

    其他页面边界

    5.4 添加页码事件到 PdfWriter

    PdfPageEvent 接口

    onOpenDocument()：当文档打开后触发，初始化变量整个文档可使用

    onStartPage()：当开始一个新页面触发，初始化页面级变量，不要在这个方法内添加内容

    onEndPage()：开始一个新页面并在文档关闭前触发，这里添加header、footer、watermark等

    onCloseDocument()：文档关闭时触发，这里释放资源

    添加页头与页尾

    1. import java.io.FileOutputStream;
    2. import java.io.IOException;
    3. import java.sql.SQLException;
    4. import com.itextpdf.text.Chapter;
    5. import com.itextpdf.text.Document;
    6. import com.itextpdf.text.DocumentException;
    7. import com.itextpdf.text.Element;
    8. import com.itextpdf.text.Font;
    9. import com.itextpdf.text.PageSize;
    10. import com.itextpdf.text.Paragraph;
    11. import com.itextpdf.text.Phrase;
    12. import com.itextpdf.text.Rectangle;
    13. import com.itextpdf.text.Font.FontFamily;
    14. import com.itextpdf.text.pdf.ColumnText;
    15. import com.itextpdf.text.pdf.PdfPageEventHelper;
    16. import com.itextpdf.text.pdf.PdfWriter;
    17.  
    18. public class MovieHistory2 {
    19.     
    20.     /** The resulting PDF file. */
    21.     public static final String RESULT
    22.         = "results/part1/chapter05/movie_history2.pdf";
    23.     
    24.     /** Inner class to add a header and a footer. */
    25.     class HeaderFooter extends PdfPageEventHelper {
    26.         /** Alternating phrase for the header. */
    27.         Phrase[] header = new Phrase[2];
    28.         /** Current page number (will be reset for every chapter). */
    29.         int pagenumber;
    30.         
    31.         /**
    32.          * Initialize one of the headers.
    33.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(
    34.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    35.          */
    36.         public void onOpenDocument(PdfWriter writer, Document document) {
    37.             header[0] = new Phrase("Movie history");
    38.         }
    39.         
    40.         /**
    41.          * Initialize one of the headers, based on the chapter title;
    42.          * reset the page number.
    43.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onChapter(
    44.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document, float,
    45.          *      com.itextpdf.text.Paragraph)
    46.          */
    47.         public void onChapter(PdfWriter writer, Document document,
    48.                 float paragraphPosition, Paragraph title) {
    49.             header[1] = new Phrase(title.getContent());
    50.             pagenumber = 1;
    51.         }
    52.  
    53.         /**
    54.          * Increase the page number.
    55.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onStartPage(
    56.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    57.          */
    58.         public void onStartPage(PdfWriter writer, Document document) {
    59.             pagenumber++;
    60.         }
    61.         
    62.         /**
    63.          * Adds the header and the footer.
    64.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(
    65.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    66.          */
    67.         public void onEndPage(PdfWriter writer, Document document) {
    68.             Rectangle rect = writer.getBoxSize("art");
    69.             switch(writer.getPageNumber() % 2) {
    70.             case 0:
    71.                 ColumnText.showTextAligned(writer.getDirectContent(),
    72.                         Element.ALIGN_RIGHT, header[0],
    73.                         rect.getRight(), rect.getTop(), 0);
    74.                 break;
    75.             case 1:
    76.                 ColumnText.showTextAligned(writer.getDirectContent(),
    77.                         Element.ALIGN_LEFT, header[1],
    78.                         rect.getLeft(), rect.getTop(), 0);
    79.                 break;
    80.             }
    81.             ColumnText.showTextAligned(writer.getDirectContent(),
    82.                     Element.ALIGN_CENTER, new Phrase(String.format("page %d", pagenumber)),
    83.                     (rect.getLeft() + rect.getRight()) / 2, rect.getBottom() - 18, 0);
    84.         }
    85.     }
    86.     
    87.     /** The different epochs. */
    88.     public static final String[] EPOCH =
    89.         { "Forties", "Fifties", "Sixties", "Seventies", "Eighties",
    90.     	  "Nineties", "Twenty-first Century" };
    91.     /** The fonts for the title. */
    92.     public static final Font[] FONT = new Font[4];
    93.     static {
    94.         FONT[0] = new Font(FontFamily.HELVETICA, 24);
    95.         FONT[1] = new Font(FontFamily.HELVETICA, 18);
    96.         FONT[2] = new Font(FontFamily.HELVETICA, 14);
    97.         FONT[3] = new Font(FontFamily.HELVETICA, 12, Font.BOLD);
    98.     }
    99.  
    100.     /**
    101.      * Creates a PDF document.
    102.      * @param filename the path to the new PDF document
    103.      * @throws    DocumentException 
    104.      * @throws    IOException
    105.      * @throws    SQLException
    106.      */
    107.     public void createPdf(String filename)
    108.         throws IOException, DocumentException, SQLException {
    109.         // step 1
    110.         Document document = new Document(PageSize.A4, 36, 36, 54, 54);
    111.         // step 2
    112.         PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
    113.         HeaderFooter event = new HeaderFooter();
    114.         writer.setBoxSize("art", new Rectangle(36, 54, 559, 788));
    115.         writer.setPageEvent(event);
    116.         // step 3
    117.         document.open();
    118.         // step 4
    119.         Chapter chapter = null;
    120.         // 初始化数据...
    121.         document.add(chapter);
    122.         // step 5
    123.         document.close();
    124.     }
    125.     
    126.     /**
    127.      * Main method.
    128.      *
    129.      * @param    args    no arguments needed
    130.      * @throws DocumentException 
    131.      * @throws IOException 
    132.      * @throws SQLException
    133.      */
    134.     public static void main(String[] args)
    135.         throws IOException, DocumentException, SQLException {
    136.         new MovieHistory2().createPdf(RESULT);
    137.     }
    138. }

    解决 page X of Y 问题

    利用XObject特性，iText 真正将PdfTemplate 写入 OutputStream 是在调用releaseTemplate() 时。

    1. import java.io.FileOutputStream;
    2. import java.io.IOException;
    3. import java.sql.SQLException;
    4. import com.itextpdf.text.Document;
    5. import com.itextpdf.text.DocumentException;
    6. import com.itextpdf.text.Element;
    7. import com.itextpdf.text.ExceptionConverter;
    8. import com.itextpdf.text.Image;
    9. import com.itextpdf.text.PageSize;
    10. import com.itextpdf.text.Phrase;
    11. import com.itextpdf.text.Rectangle;
    12. import com.itextpdf.text.pdf.ColumnText;
    13. import com.itextpdf.text.pdf.PdfPCell;
    14. import com.itextpdf.text.pdf.PdfPTable;
    15. import com.itextpdf.text.pdf.PdfPageEventHelper;
    16. import com.itextpdf.text.pdf.PdfTemplate;
    17. import com.itextpdf.text.pdf.PdfWriter;
    18.  
    19. public class MovieCountries1 {
    20.     
    21.     /** The resulting PDF file. */
    22.     public static final String RESULT
    23.         = "D:/data/iText/inAction/chapter05/movie_countries1.pdf";
    24.  
    25.     /**
    26.      * Inner class to add a table as header.
    27.      */
    28.     class TableHeader extends PdfPageEventHelper {
    29.         /** The header text. */
    30.         String header;
    31.         /** The template with the total number of pages. */
    32.         PdfTemplate total;
    33.         
    34.         /**
    35.          * Allows us to change the content of the header.
    36.          * @param header The new header String
    37.          */
    38.         public void setHeader(String header) {
    39.             this.header = header;
    40.         }
    41.  
    42.         /**
    43.          * Creates the PdfTemplate that will hold the total number of pages.
    44.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(
    45.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    46.          */
    47.         public void onOpenDocument(PdfWriter writer, Document document) {
    48.             total = writer.getDirectContent().createTemplate(30, 16);
    49.         }
    50.         
    51.         /**
    52.          * Adds a header to every page
    53.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(
    54.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    55.          */
    56.         public void onEndPage(PdfWriter writer, Document document) {
    57.             PdfPTable table = new PdfPTable(3);
    58.             try {
    59.                 table.setWidths(new int[]{24, 24, 2});
    60.                 table.setTotalWidth(527);
    61.                 table.setLockedWidth(true);
    62.                 table.getDefaultCell().setFixedHeight(20);
    63.                 table.getDefaultCell().setBorder(Rectangle.BOTTOM);
    64.                 table.addCell(header);
    65.                 table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
    66.                 table.addCell(String.format("Page %d of", writer.getPageNumber()));
    67.                 PdfPCell cell = new PdfPCell(Image.getInstance(total));
    68.                 cell.setBorder(Rectangle.BOTTOM);
    69.                 table.addCell(cell);
    70.                 table.writeSelectedRows(0, -1, 34, 803, writer.getDirectContent());
    71.             }
    72.             catch(DocumentException de) {
    73.                 throw new ExceptionConverter(de);
    74.             }
    75.         }
    76.         
    77.         /**
    78.          * Fills out the total number of pages before the document is closed.
    79.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(
    80.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    81.          */
    82.         public void onCloseDocument(PdfWriter writer, Document document) {
    83.             ColumnText.showTextAligned(total, Element.ALIGN_LEFT,
    84.                     new Phrase(String.valueOf(writer.getPageNumber() - 1)),
    85.                     2, 2, 0);
    86.         }
    87.     }
    88.  
    89.     /**
    90.      * Creates a PDF document.
    91.      * @param filename the path to the new PDF document
    92.      * @throws    DocumentException 
    93.      * @throws    IOException
    94.      * @throws    SQLException
    95.      */
    96.     public void createPdf(String filename)
    97.         throws IOException, DocumentException, SQLException {
    98.         // step 1
    99.         Document document = new Document(PageSize.A4, 36, 36, 54, 36);
    100.         // step 2
    101.         PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
    102.         TableHeader event = new TableHeader();
    103.         writer.setPageEvent(event);
    104.         // step 3
    105.         document.open();
    106.         // step 4
    107.         // 新建页面数据...
    108.         document.add(new Phrase("Hello Page 1."));
    109.         document.newPage();
    110.         document.add(new Phrase("Hello Page 2."));
    111.         document.newPage();
    112.         document.add(new Phrase("Hello Page 3."));
    113.         document.newPage();
    114.         document.add(new Phrase("Hello Page 4."));
    115.         // step 4
    116.         document.close();
    117.     }
    118.     
    119.     /**
    120.      * Main method.
    121.      *
    122.      * @param    args    no arguments needed
    123.      * @throws DocumentException 
    124.      * @throws IOException 
    125.      * @throws SQLException
    126.      */
    127.     public static void main(String[] args)
    128.         throws IOException, DocumentException, SQLException {
    129.         new MovieCountries1().createPdf(RESULT);
    130.     }
    131. }

    在页尾添加页码

    1. import java.io.FileOutputStream;
    2. import java.io.IOException;
    3. import java.sql.SQLException;
    4. import com.itextpdf.text.Document;
    5. import com.itextpdf.text.DocumentException;
    6. import com.itextpdf.text.ExceptionConverter;
    7. import com.itextpdf.text.PageSize;
    8. import com.itextpdf.text.Phrase;
    9. import com.itextpdf.text.pdf.BaseFont;
    10. import com.itextpdf.text.pdf.PdfContentByte;
    11. import com.itextpdf.text.pdf.PdfPageEventHelper;
    12. import com.itextpdf.text.pdf.PdfTemplate;
    13. import com.itextpdf.text.pdf.PdfWriter;
    14.  
    15. /**
    16.  * TODO 在此写上类的相关说明.
    17.  * @author gongqiang 
    18.  * @version 1.0.0 2023年9月18日
    19.  * @see 
    20.  * @since JDK 1.5.0
    21.  */
    22. public class MovieCountries {
    23.     
    24.     /** The resulting PDF file. */
    25.     public static final String RESULT
    26.         = "D:/data/iText/inAction/chapter05/movie_countries.pdf";
    27.  
    28.     /**
    29.      * Inner class to add a table as header.
    30.      */
    31.     class TableHeader extends PdfPageEventHelper {
    32.         /** The header text. */
    33.         String header;
    34.         /** The template with the total number of pages. */
    35.         PdfTemplate total;
    36.         
    37.         BaseFont baseFont;
    38.         
    39.         int fontSize = 14;
    40.         /**
    41.          * Allows us to change the content of the header.
    42.          * @param header The new header String
    43.          */
    44.         public void setHeader(String header) {
    45.             this.header = header;
    46.         }
    47.  
    48.         /**
    49.          * Creates the PdfTemplate that will hold the total number of pages.
    50.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(
    51.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    52.          */
    53.         public void onOpenDocument(PdfWriter writer, Document document) {
    54.             total = writer.getDirectContent().createTemplate(30, 16);
    55.             try {
    56.                 baseFont = BaseFont.createFont("D:/data/iText/fonts/simfang.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
    57.             } catch (Exception e) {
    58.                 throw new ExceptionConverter(e);
    59.             }
    60.         }
    61.         
    62.         /**
    63.          * Adds a header to every page
    64.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(
    65.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    66.          */
    67.         public void onEndPage(PdfWriter writer, Document document) {
    68.             // 新建获得用户页面文本和图片内容位置的对象
    69.             PdfContentByte pdfContentByte = writer.getDirectContent();
    70.             // 保存图形状态
    71.             pdfContentByte.saveState();
    72.             String text = "页" + writer.getPageNumber() + "/";
    73.             //String text = "页 99/";
    74.             // 获取点字符串的宽度
    75.             float textSize = baseFont.getWidthPoint(text, fontSize);
    76.             pdfContentByte.beginText();
    77.             // 设置随后的文本内容写作的字体和字号
    78.             pdfContentByte.setFontAndSize(baseFont, fontSize);
    79.      
    80.             // 定位'X/'
    81. //            float x = (document.right() + document.left()) / 2;
    82.             float x = document.right() - 50;
    83.             float y = 20f;
    84.             pdfContentByte.setTextMatrix(x, y);
    85.             pdfContentByte.showText(text);
    86.             pdfContentByte.endText();
    87.      
    88.             // 将模板加入到内容（content）中- // 定位'Y'
    89.             pdfContentByte.addTemplate(total, x + textSize, y);
    90.      
    91.             pdfContentByte.restoreState();
    92.         }
    93.         
    94.         /**
    95.          * Fills out the total number of pages before the document is closed.
    96.          * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(
    97.          *      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
    98.          */
    99.         public void onCloseDocument(PdfWriter writer, Document document) {
    100.         	total.beginText();
    101.         	total.setFontAndSize(baseFont, fontSize);
    102.         	total.setTextMatrix(0, 0);
    103.             // 设置总页数的值到模板上，并应用到每个界面
    104.         	total.showText(String.valueOf(writer.getPageNumber()));
    105.         	//total.showText(String.valueOf("99"));
    106.         	total.endText();
    107.         }
    108.     }
    109.  
    110.     /**
    111.      * Creates a PDF document.
    112.      * @param filename the path to the new PDF document
    113.      * @throws    DocumentException 
    114.      * @throws    IOException
    115.      * @throws    SQLException
    116.      */
    117.     public void createPdf(String filename)
    118.         throws IOException, DocumentException, SQLException {
    119.         // step 1
    120.         Document document = new Document(PageSize.A4, 36, 36, 54, 36);
    121.         // step 2
    122.         PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
    123.         TableHeader event = new TableHeader();
    124.         writer.setPageEvent(event);
    125.         // step 3
    126.         document.open();
    127.         // step 4
    128.         // 新建页面数据...
    129.         document.add(new Phrase("Hello Page 1."));
    130.         document.newPage();
    131.         document.add(new Phrase("Hello Page 2."));
    132.         document.newPage();
    133.         document.add(new Phrase("Hello Page 3."));
    134.         document.newPage();
    135.         document.add(new Phrase("Hello Page 4."));
    136.         // step 4
    137.         document.close();
    138.     }
    139.     
    140.     /**
    141.      * Main method.
    142.      *
    143.      * @param    args    no arguments needed
    144.      * @throws DocumentException 
    145.      * @throws IOException 
    146.      * @throws SQLException
    147.      */
    148.     public static void main(String[] args)
    149.         throws IOException, DocumentException, SQLException {
    150.         new MovieCountries().createPdf(RESULT);
    151.     }
    152. }

    添加水印

    如果水印是图片，可以通过PdfContentByte.addImage()、或将图片包装成ColumnText对象，或者添加到表格的cell里。

    注意：Image对象需要在onOpenDocument()方法内初始化，避免重复添加图片的字节流。

    1. import java.io.FileOutputStream;
    2. import java.io.IOException;
    3. import java.sql.SQLException;
    4. import com.itextpdf.text.Document;
    5. import com.itextpdf.text.DocumentException;
    6. import com.itextpdf.text.Element;
    7. import com.itextpdf.text.Font;
    8. import com.itextpdf.text.Font.FontFamily;
    9. import com.itextpdf.text.PageSize;
    10. import com.itextpdf.text.Phrase;
    11. import com.itextpdf.text.pdf.ColumnText;
    12. import com.itextpdf.text.pdf.GrayColor;
    13. import com.itextpdf.text.pdf.PdfPageEventHelper;
    14. import com.itextpdf.text.pdf.PdfWriter;
    15.  
    16. public class MovieCountries2 extends MovieCountries1 {
    17.     
    18.     /** The resulting PDF file. */
    19.     public static final String RESULT
    20.         = "D:/data/iText/inAction/chapter05/movie_countries2.pdf";
    21.  
    22.     /**
    23.      * Inner class to add a watermark to every page.
    24.      */
    25.     class Watermark extends PdfPageEventHelper {
    26.         
    27.         Font FONT = new Font(FontFamily.HELVETICA, 52, Font.BOLD, new GrayColor(0.75f));
    28.         
    29.         public void onEndPage(PdfWriter writer, Document document) {
    30.             ColumnText.showTextAligned(writer.getDirectContentUnder(),
    31.                     Element.ALIGN_CENTER, new Phrase("FOOBAR FILM FESTIVAL", FONT),
    32.                     297.5f, 421, writer.getPageNumber() % 2 == 1 ? 45 : -45);
    33.         }
    34.     }
    35.  
    36.     /**
    37.      * Creates a PDF document.
    38.      * @param filename the path to the new PDF document
    39.      * @throws    DocumentException 
    40.      * @throws    IOException
    41.      * @throws    SQLException
    42.      */
    43.     public void createPdf(String filename)
    44.         throws IOException, DocumentException, SQLException {
    45.         // step 1
    46.         Document document = new Document(PageSize.A4, 36, 36, 54, 36);
    47.         // step 2
    48.         PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
    49.         TableHeader event = new TableHeader();
    50.         writer.setPageEvent(event);
    51.         writer.setPageEvent(new Watermark());
    52.         // step 3
    53.         document.open();
    54.         // step 4
    55.         // 新建页面数据...
    56.         document.add(new Phrase("Hello Page 1."));
    57.         document.newPage();
    58.         document.add(new Phrase("Hello Page 2."));
    59.         document.newPage();
    60.         document.add(new Phrase("Hello Page 3."));
    61.         document.newPage();
    62.         document.add(new Phrase("Hello Page 4."));
    63.         // step 5
    64.         document.close();
    65.     }
    66.     
    67.     /**
    68.      * Main method.
    69.      *
    70.      * @param    args    no arguments needed
    71.      * @throws DocumentException 
    72.      * @throws IOException 
    73.      * @throws SQLException
    74.      */
    75.     public static void main(String[] args)
    76.         throws IOException, DocumentException, SQLException {
    77.         new MovieCountries2().createPdf(RESULT);
    78.     }
    79. }

    创建幻灯片

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  • 原文地址：https://blog.csdn.net/gqltt/article/details/132993512