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现代通信技术专业学什么,网站seo快速,wordpress for sae,下载手机app并安装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（…

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.SQLException;
import com.itextpdf.text.Chapter;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.Font.FontFamily;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfWriter;public class MovieHistory2 {/** The resulting PDF file. */public static final String RESULT= "results/part1/chapter05/movie_history2.pdf";/** 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);}}/** The different epochs. */public static final String[] EPOCH ={ "Forties", "Fifties", "Sixties", "Seventies", "Eighties","Nineties", "Twenty-first Century" };/** The fonts for the title. */public static final Font[] FONT = new Font[4];static {FONT[0] = new Font(FontFamily.HELVETICA, 24);FONT[1] = new Font(FontFamily.HELVETICA, 18);FONT[2] = new Font(FontFamily.HELVETICA, 14);FONT[3] = new Font(FontFamily.HELVETICA, 12, Font.BOLD);}/*** Creates a PDF document.* @param filename the path to the new PDF document* @throws    DocumentException * @throws    IOException* @throws    SQLException*/public void createPdf(String filename)throws IOException, DocumentException, SQLException {// step 1Document document = new Document(PageSize.A4, 36, 36, 54, 54);// step 2PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));HeaderFooter event = new HeaderFooter();writer.setBoxSize("art", new Rectangle(36, 54, 559, 788));writer.setPageEvent(event);// step 3document.open();// step 4Chapter chapter = null;// 初始化数据...document.add(chapter);// step 5document.close();}/*** Main method.** @param    args    no arguments needed* @throws DocumentException * @throws IOException * @throws SQLException*/public static void main(String[] args)throws IOException, DocumentException, SQLException {new MovieHistory2().createPdf(RESULT);}
}

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。

import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.SQLException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;public class MovieCountries1 {/** The resulting PDF file. */public static final String RESULT= "D:/data/iText/inAction/chapter05/movie_countries1.pdf";/*** Inner class to add a table as header.*/class TableHeader extends PdfPageEventHelper {/** The header text. */String header;/** The template with the total number of pages. */PdfTemplate total;/*** Allows us to change the content of the header.* @param header The new header String*/public void setHeader(String header) {this.header = header;}/*** Creates the PdfTemplate that will hold the total number of pages.* @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onOpenDocument(PdfWriter writer, Document document) {total = writer.getDirectContent().createTemplate(30, 16);}/*** Adds a header to every page* @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onEndPage(PdfWriter writer, Document document) {PdfPTable table = new PdfPTable(3);try {table.setWidths(new int[]{24, 24, 2});table.setTotalWidth(527);table.setLockedWidth(true);table.getDefaultCell().setFixedHeight(20);table.getDefaultCell().setBorder(Rectangle.BOTTOM);table.addCell(header);table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);table.addCell(String.format("Page %d of", writer.getPageNumber()));PdfPCell cell = new PdfPCell(Image.getInstance(total));cell.setBorder(Rectangle.BOTTOM);table.addCell(cell);table.writeSelectedRows(0, -1, 34, 803, writer.getDirectContent());}catch(DocumentException de) {throw new ExceptionConverter(de);}}/*** Fills out the total number of pages before the document is closed.* @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onCloseDocument(PdfWriter writer, Document document) {ColumnText.showTextAligned(total, Element.ALIGN_LEFT,new Phrase(String.valueOf(writer.getPageNumber() - 1)),2, 2, 0);}}/*** Creates a PDF document.* @param filename the path to the new PDF document* @throws    DocumentException * @throws    IOException* @throws    SQLException*/public void createPdf(String filename)throws IOException, DocumentException, SQLException {// step 1Document document = new Document(PageSize.A4, 36, 36, 54, 36);// step 2PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));TableHeader event = new TableHeader();writer.setPageEvent(event);// step 3document.open();// step 4// 新建页面数据...document.add(new Phrase("Hello Page 1."));document.newPage();document.add(new Phrase("Hello Page 2."));document.newPage();document.add(new Phrase("Hello Page 3."));document.newPage();document.add(new Phrase("Hello Page 4."));// step 4document.close();}/*** Main method.** @param    args    no arguments needed* @throws DocumentException * @throws IOException * @throws SQLException*/public static void main(String[] args)throws IOException, DocumentException, SQLException {new MovieCountries1().createPdf(RESULT);}
}

在页尾添加页码

import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.SQLException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;/*** TODO 在此写上类的相关说明.<br>* @author gongqiang <br>* @version 1.0.0 2023年9月18日<br>* @see * @since JDK 1.5.0*/
public class MovieCountries {/** The resulting PDF file. */public static final String RESULT= "D:/data/iText/inAction/chapter05/movie_countries.pdf";/*** Inner class to add a table as header.*/class TableHeader extends PdfPageEventHelper {/** The header text. */String header;/** The template with the total number of pages. */PdfTemplate total;BaseFont baseFont;int fontSize = 14;/*** Allows us to change the content of the header.* @param header The new header String*/public void setHeader(String header) {this.header = header;}/*** Creates the PdfTemplate that will hold the total number of pages.* @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onOpenDocument(PdfWriter writer, Document document) {total = writer.getDirectContent().createTemplate(30, 16);try {baseFont = BaseFont.createFont("D:/data/iText/fonts/simfang.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);} catch (Exception e) {throw new ExceptionConverter(e);}}/*** Adds a header to every page* @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onEndPage(PdfWriter writer, Document document) {// 新建获得用户页面文本和图片内容位置的对象PdfContentByte pdfContentByte = writer.getDirectContent();// 保存图形状态pdfContentByte.saveState();String text = "页" + writer.getPageNumber() + "/";//String text = "页 99/";// 获取点字符串的宽度float textSize = baseFont.getWidthPoint(text, fontSize);pdfContentByte.beginText();// 设置随后的文本内容写作的字体和字号pdfContentByte.setFontAndSize(baseFont, fontSize);// 定位'X/'
//            float x = (document.right() + document.left()) / 2;float x = document.right() - 50;float y = 20f;pdfContentByte.setTextMatrix(x, y);pdfContentByte.showText(text);pdfContentByte.endText();// 将模板加入到内容（content）中- // 定位'Y'pdfContentByte.addTemplate(total, x + textSize, y);pdfContentByte.restoreState();}/*** Fills out the total number of pages before the document is closed.* @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(*      com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)*/public void onCloseDocument(PdfWriter writer, Document document) {total.beginText();total.setFontAndSize(baseFont, fontSize);total.setTextMatrix(0, 0);// 设置总页数的值到模板上，并应用到每个界面total.showText(String.valueOf(writer.getPageNumber()));//total.showText(String.valueOf("99"));total.endText();}}/*** Creates a PDF document.* @param filename the path to the new PDF document* @throws    DocumentException * @throws    IOException* @throws    SQLException*/public void createPdf(String filename)throws IOException, DocumentException, SQLException {// step 1Document document = new Document(PageSize.A4, 36, 36, 54, 36);// step 2PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));TableHeader event = new TableHeader();writer.setPageEvent(event);// step 3document.open();// step 4// 新建页面数据...document.add(new Phrase("Hello Page 1."));document.newPage();document.add(new Phrase("Hello Page 2."));document.newPage();document.add(new Phrase("Hello Page 3."));document.newPage();document.add(new Phrase("Hello Page 4."));// step 4document.close();}/*** Main method.** @param    args    no arguments needed* @throws DocumentException * @throws IOException * @throws SQLException*/public static void main(String[] args)throws IOException, DocumentException, SQLException {new MovieCountries().createPdf(RESULT);}
}

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。

import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.SQLException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Font.FontFamily;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.GrayColor;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfWriter;public class MovieCountries2 extends MovieCountries1 {/** The resulting PDF file. */public static final String RESULT= "D:/data/iText/inAction/chapter05/movie_countries2.pdf";/*** Inner class to add a watermark to every page.*/class Watermark extends PdfPageEventHelper {Font FONT = new Font(FontFamily.HELVETICA, 52, Font.BOLD, new GrayColor(0.75f));public void onEndPage(PdfWriter writer, Document document) {ColumnText.showTextAligned(writer.getDirectContentUnder(),Element.ALIGN_CENTER, new Phrase("FOOBAR FILM FESTIVAL", FONT),297.5f, 421, writer.getPageNumber() % 2 == 1 ? 45 : -45);}}/*** Creates a PDF document.* @param filename the path to the new PDF document* @throws    DocumentException * @throws    IOException* @throws    SQLException*/public void createPdf(String filename)throws IOException, DocumentException, SQLException {// step 1Document document = new Document(PageSize.A4, 36, 36, 54, 36);// step 2PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));TableHeader event = new TableHeader();writer.setPageEvent(event);writer.setPageEvent(new Watermark());// step 3document.open();// step 4// 新建页面数据...document.add(new Phrase("Hello Page 1."));document.newPage();document.add(new Phrase("Hello Page 2."));document.newPage();document.add(new Phrase("Hello Page 3."));document.newPage();document.add(new Phrase("Hello Page 4."));// step 5document.close();}/*** Main method.** @param    args    no arguments needed* @throws DocumentException * @throws IOException * @throws SQLException*/public static void main(String[] args)throws IOException, DocumentException, SQLException {new MovieCountries2().createPdf(RESULT);}
}

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