Para ver los ejemplos de este capítulo, consulte la publicación del blog que traduje : notas de estudio itext7-Capítulo 3 , que tiene una explicación detallada.Si no entiende, puede comentarme o enviarme un mensaje privado.
Ejemplo 1: escribir un periódico diario
La página se divide en tres columnas, y luego agrega texto e imágenes, el código es el siguiente:
import com.itextpdf.io.font.FontConstants;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.layout.ColumnDocumentRenderer;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.*;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
/**
* Simple column renderer example.
*/
public class C03E01_NewYorkTimes {
public static final String DEST = "results/chapter03/new_york_times.pdf";
public static final String APPLE_IMG = "src/main/resources/img/ny_times_apple.jpg";
public static final String APPLE_TXT = "src/main/resources/data/ny_times_apple.txt";
public static final String FACEBOOK_IMG = "src/main/resources/img/ny_times_fb.jpg";
public static final String FACEBOOK_TXT = "src/main/resources/data/ny_times_fb.txt";
public static final String INST_IMG = "src/main/resources/img/ny_times_inst.jpg";
public static final String INST_TXT = "src/main/resources/data/ny_times_inst.txt";
static PdfFont timesNewRoman = null;
static PdfFont timesNewRomanBold = null;
public static void main(String[] args) throws Exception {
timesNewRoman = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
timesNewRomanBold = PdfFontFactory.createFont(FontConstants.TIMES_BOLD);
File file = new File(DEST);
file.getParentFile().mkdirs();
new C03E01_NewYorkTimes().createPdf(DEST);
}
protected void createPdf(String dest) throws Exception {
//Initialize PDF document
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
PageSize ps = PageSize.A5;
// Initialize document
Document document = new Document(pdf, ps);
//Set column parameters
float offSet = 36;
float columnWidth = (ps.getWidth() - offSet * 2 + 10) / 3;
float columnHeight = ps.getHeight() - offSet * 2;
//Define column areas
Rectangle[] columns = {new Rectangle(offSet - 5, offSet, columnWidth, columnHeight),
new Rectangle(offSet + columnWidth, offSet, columnWidth, columnHeight),
new Rectangle(offSet + columnWidth * 2 + 5, offSet, columnWidth, columnHeight)};
document.setRenderer(new ColumnDocumentRenderer(document, columns));
Image apple = new Image(ImageDataFactory.create(APPLE_IMG)).setWidth(columnWidth);
String articleApple = new String(Files.readAllBytes(Paths.get(APPLE_TXT)), StandardCharsets.UTF_8);
C03E01_NewYorkTimes.addArticle(document, "Apple Encryption Engineers, if Ordered to Unlock iPhone, Might Resist", "By JOHN MARKOFF MARCH 18, 2016", apple, articleApple);
Image facebook = new Image(ImageDataFactory.create(FACEBOOK_IMG)).setWidth(columnWidth);
String articleFB = new String(Files.readAllBytes(Paths.get(FACEBOOK_TXT)), StandardCharsets.UTF_8);
C03E01_NewYorkTimes.addArticle(document, "With \"Smog Jog\" Through Beijing, Zuckerberg Stirs Debate on Air Pollution", "By PAUL MOZUR MARCH 18, 2016", facebook, articleFB);
Image inst = new Image(ImageDataFactory.create(INST_IMG)).setWidth(columnWidth);
String articleInstagram = new String(Files.readAllBytes(Paths.get(INST_TXT)), StandardCharsets.UTF_8);
C03E01_NewYorkTimes.addArticle(document, "Instagram May Change Your Feed, Personalizing It With an Algorithm","By MIKE ISAAC MARCH 15, 2016", inst, articleInstagram);
document.close();
}
public static void addArticle(Document doc, String title, String author, Image img, String text) throws IOException {
Paragraph p1 = new Paragraph(title)
.setFont(timesNewRomanBold)
.setFontSize(14);
doc.add(p1);
doc.add(img);
Paragraph p2 = new Paragraph()
.setFont(timesNewRoman)
.setFontSize(7)
.setFontColor(Color.GRAY)
.add(author);
doc.add(p2);
Paragraph p3 = new Paragraph()
.setFont(timesNewRoman)
.setFontSize(10)
.add(text);
doc.add(p3);
}
}Ejemplo 2: diferentes tablas
Dibuja una tabla, la primera columna son celdas de esquina redondeada, el color de fondo de cada columna es diferente, según el número de columna, el código es el siguiente:
import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.color.DeviceCmyk;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.property.HorizontalAlignment;
import com.itextpdf.layout.border.SolidBorder;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.renderer.CellRenderer;
import com.itextpdf.layout.renderer.DrawContext;
import java.io.*;
import java.util.StringTokenizer;
/**
* Simple table renderer example.
*/
public class C03E02_PremierLeague {
public static final String DATA = "src/main/resources/data/premier_league.csv";
public static final String DEST = "results/chapter03/premier_league.pdf";
Color greenColor = new DeviceCmyk(0.78f, 0, 0.81f, 0.21f);
Color yellowColor = new DeviceCmyk(0, 0, 0.76f, 0.01f);
Color redColor = new DeviceCmyk(0, 0.76f, 0.86f, 0.01f);
Color blueColor = new DeviceCmyk(0.28f, 0.11f, 0, 0);
public static void main(String args[]) throws IOException {
File file = new File(DEST);
file.getParentFile().mkdirs();
new C03E02_PremierLeague().createPdf(DEST);
}
public void createPdf(String dest) throws IOException {
//Initialize PDF document
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
PageSize ps = new PageSize(842, 680);
// Initialize document
Document document = new Document(pdf, ps);
PdfFont font = PdfFontFactory.createFont(FontConstants.HELVETICA);
PdfFont bold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
Table table = new Table(new float[]{
1.5f, 7, 2, 2, 2, 2, 3, 4, 4, 2});
table.setWidthPercent(100)
.setTextAlignment(TextAlignment.CENTER)
.setHorizontalAlignment(HorizontalAlignment.CENTER);
BufferedReader br = new BufferedReader(new FileReader(DATA));
String line = br.readLine();
process(table, line, bold, true);
while ((line = br.readLine()) != null) {
process(table, line, font, false);
}
br.close();
document.add(table);
//Close document
document.close();
}
public void process(Table table, String line, PdfFont font, boolean isHeader) {
StringTokenizer tokenizer = new StringTokenizer(line, ";");
int columnNumber = 0;
while (tokenizer.hasMoreTokens()) {
if (isHeader) {
Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
cell.setNextRenderer(new RoundedCornersCellRenderer(cell));
cell.setPadding(5).setBorder(null);
table.addHeaderCell(cell);
} else {
columnNumber++;
Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
cell.setFont(font).setBorder(new SolidBorder(Color.BLACK, 0.5f));
switch (columnNumber) {
case 4:
cell.setBackgroundColor(greenColor);
break;
case 5:
cell.setBackgroundColor(yellowColor);
break;
case 6:
cell.setBackgroundColor(redColor);
break;
default:
cell.setBackgroundColor(blueColor);
break;
}
table.addCell(cell);
}
}
}
private class RoundedCornersCellRenderer extends CellRenderer {
public RoundedCornersCellRenderer(Cell modelElement) {
super(modelElement);
}
@Override
public void drawBorder(DrawContext drawContext) {
Rectangle rectangle = getOccupiedAreaBBox();
float llx = rectangle.getX() + 1;
float lly = rectangle.getY() + 1;
float urx = rectangle.getX() + getOccupiedAreaBBox().getWidth() - 1;
float ury = rectangle.getY() + getOccupiedAreaBBox().getHeight() - 1;
PdfCanvas canvas = drawContext.getCanvas();
float r = 4;
float b = 0.4477f;
canvas.moveTo(llx, lly).lineTo(urx, lly).lineTo(urx, ury - r)
.curveTo(urx, ury - r * b, urx - r * b, ury, urx - r, ury)
.lineTo(llx + r, ury)
.curveTo(llx + r * b, ury, llx, ury - r * b, llx, ury - r)
.lineTo(llx, lly).stroke();
super.drawBorder(drawContext);
}
}Ejemplo 3: agregar encabezado, pie de página y marca de agua
Dibuje una tabla con diferentes colores de fondo para páginas pares e impares, agregue encabezado, pie de página y marca de agua, el código es el siguiente:
import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.color.DeviceCmyk;
import com.itextpdf.kernel.events.Event;
import com.itextpdf.kernel.events.IEventHandler;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.border.SolidBorder;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.Property;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.UnitValue;
import com.itextpdf.layout.property.VerticalAlignment;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.StringTokenizer;
/**
* Simple event handler example.
*/
public class C03E03_UFO {
public static final String DATA = "src/main/resources/data/ufo.csv";
public static final String DEST = "results/chapter03/ufo.pdf";
static PdfFont helvetica = null;
static PdfFont helveticaBold = null;
public static void main(String[] args) throws Exception {
helvetica = PdfFontFactory.createFont(FontConstants.HELVETICA);
helveticaBold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
File file = new File(DEST);
file.getParentFile().mkdirs();
new C03E03_UFO().createPdf(DEST);
}
protected void createPdf(String dest) throws Exception {
//Initialize PDF document
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler());
// Initialize document
Document document = new Document(pdf);
Paragraph p = new Paragraph("List of reported UFO sightings in 20th century")
.setTextAlignment(TextAlignment.CENTER).setFont(helveticaBold).setFontSize(14);
document.add(p);
Table table = new Table(UnitValue.createPercentArray(new float[]{
3, 5, 7, 4}));
BufferedReader br = new BufferedReader(new FileReader(DATA));
String line = br.readLine();
process(table, line, helveticaBold, true);
while ((line = br.readLine()) != null) {
process(table, line, helvetica, false);
}
br.close();
document.add(table);
document.close();
}
public void process(Table table, String line, PdfFont font, boolean isHeader) {
StringTokenizer tokenizer = new StringTokenizer(line, ";");
while (tokenizer.hasMoreTokens()) {
if (isHeader) {
table.addHeaderCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
} else {
table.addCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
}
}
}
protected class MyEventHandler implements IEventHandler {
public void handleEvent(Event event) {
PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
PdfDocument pdfDoc = docEvent.getDocument();
PdfPage page = docEvent.getPage();
int pageNumber = pdfDoc.getPageNumber(page);
Rectangle pageSize = page.getPageSize();
PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc);
//Set background
Color limeColor = new DeviceCmyk(0.208f, 0, 0.584f, 0);
Color blueColor = new DeviceCmyk(0.445f, 0.0546f, 0, 0.0667f);
pdfCanvas.saveState()
.setFillColor(pageNumber % 2 == 1 ? limeColor : blueColor)
.rectangle(pageSize.getLeft(), pageSize.getBottom(), pageSize.getWidth(), pageSize.getHeight())
.fill().restoreState();
//Add header and footer
pdfCanvas.beginText()
.setFontAndSize(helvetica, 9)
.moveText(pageSize.getWidth() / 2 - 60, pageSize.getTop() - 20)
.showText("THE TRUTH IS OUT THERE")
.moveText(60, -pageSize.getTop() + 30)
.showText(String.valueOf(pageNumber))
.endText();
//Add watermark
Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
canvas.setFontColor(Color.WHITE);
canvas.setProperty(Property.FONT_SIZE, 60);
canvas.setProperty(Property.FONT, helveticaBold);
canvas.showTextAligned(new Paragraph("CONFIDENTIAL"), 298, 421, pdfDoc.getPageNumber(page),
TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
pdfCanvas.release();
}
}
}Descarga de código de ejemplo
El código de este capítulo se puede descargar en la siguiente dirección (proyecto IDEA): iText7 —— Capítulo 3 Proyecto de código fuente