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
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 1
Document document = new Document(PageSize.A4, 36, 36, 54, 54);
// step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
HeaderFooter event = new HeaderFooter();
writer.setBoxSize("art", new Rectangle(36, 54, 559, 788));
writer.setPageEvent(event);
// step 3
document.open();
// step 4
Chapter chapter = null;
// 初始化数据...
document.add(chapter);
// step 5
document.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 1
Document document = new Document(PageSize.A4, 36, 36, 54, 36);
// step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
TableHeader event = new TableHeader();
writer.setPageEvent(event);
// step 3
document.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 4
document.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.
* @author gongqiang
* @version 1.0.0 2023年9月18日
* @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 1
Document document = new Document(PageSize.A4, 36, 36, 54, 36);
// step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
TableHeader event = new TableHeader();
writer.setPageEvent(event);
// step 3
document.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 4
document.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
创建幻灯片