How do I use iText Document class?

The com.itextpdf.text.Document is the core class of the iText library. This class represents a pdf document. Basically to work with a document we must first create an instance of a Document. After the instance created we open the document by calling the open() method. To add some content into the document we can use the add() method. Finally after done with the document we must close it by calling the close() method.

If you need to write and flush the document into a file we can use a PdfWriter class. The class constructor accept a Document object and an OutputStream object to do the work.

package org.kodejava.example.itextpdf;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;

public class DocumentDemo {
    public static void main(String[] args) {
        // Creates an instance of a Document.
        Document document = new Document();
        try {
            // To work with a Document we must open the document, add
            // some contents and finally close the document.
            document.open();
            document.add(new Paragraph("Hello World!"));
            document.close();
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }
}

Maven Dependencies

<!-- http://repo1.maven.org/maven2/com/itextpdf/itextpdf/5.5.10/itextpdf-5.5.10.jar -->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.10</version>
</dependency>

How do I create a PDF document using iText?

This example is the first example of the iText series, we are going to start by learning to use the iText PDF library to create a PDF document. We will see how to use the Document class, getting an instance of PdfWriter, creating a simple Paragraph and set the text alignment and the font.

The basic steps to produce a PDF documents are:

  • Create a Document object that represents a PDF document.
  • The PdfWrite object that need the Document and an OutputStream object write the content of the PDF we added to the Document into a PDF file.
  • We add a paragraph into the Document instance using the Paragraph object.
  • Finally we need to close the document by calling the Document.close() method.

And here is a code example that demonstrate the creation of a PDF document.

package org.kodejava.example.itextpdf;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class DocumentCreate {
    public static void main(String[] args) {
        // Create a new document.
        Document document = new Document();
        try {
            // Get an instance of PdfWriter and create a HelloWorld.pdf
            // file as an output.
            PdfWriter.getInstance(document,
                    new FileOutputStream(new File("HelloWorld.pdf")));
            document.open();

            // Create our first paragraph for the pdf document to be
            // created. We also set the alignment and the font of the
            // paragraph.
            String text = "Kode Java website provides beginners to Java " +
                    "programming some examples to use the Java API " +
                    "(Application Programming Interface) to develop " +
                    "applications. Learning from some examples will " +
                    "hopefully decrease the time required to learn " +
                    "Java.";
            Paragraph paragraph = new Paragraph(text);
            paragraph.setAlignment(Element.ALIGN_JUSTIFIED);
            paragraph.setFont(new Font(
                    Font.FontFamily.HELVETICA, 10, Font.NORMAL));

            document.add(paragraph);
        } catch (DocumentException | FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            document.close();
        }
    }
}

Maven Dependencies

<!-- http://repo1.maven.org/maven2/com/itextpdf/itextpdf/5.5.10/itextpdf-5.5.10.jar -->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.10</version>
</dependency>