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USANDO IRONPDF PARA JAVA

Generador de PDFs en Java (Tutorial de Ejemplo de Código)

Darrius Serrant
Darrius Serrant
Actualizado:

This article will explore how to use IronPDF to generate new files, extract content, and save PDFs.

How to Generate PDF Files in Java

  1. Install IronPDF Java Library for PDF Generation
  2. Render PDF from HTML string with renderHtmlAsPdf method
  3. Render PDF from HTML file with renderHtmlFileAsPdf method
  4. Render PDF from URL with renderUrlAsPdf method
  5. Apply password protection on the newly generated PDF in Java

IronPDF for Java

IronPDF for Java is built for generating PDF documents or PDF forms from HTML code, whether from a file, HTML string, HTML pages, or URL. It generates PDF files with accuracy, and formatting is also preserved. It is designed in a way that developers find it easy to use.

IronPDF is built on top of the .NET Framework, allowing it to be a versatile tool for generating PDFs in various contexts.

IronPDF provides the following functions for generating and manipulating large documents:

  1. The ability to add and extract content from PDFs (text, images, tables, etc.)
  2. The ability to control the layout and formatting of the document (e.g., set fonts, colors, margins...)
  3. The ability to complete forms and add digital signatures

Steps to Create a PDF File in a Java Application

Prerequisites

To use IronPDF to create a PDF generating tool, the following software needs to be installed on the computer:

  1. Java Development Kit - JDK is required for building and running Java programs. If it is not installed, download the latest release from the Oracle Website.
  2. Integrated Development Environment - IDE is software that helps write, edit, and debug a program. Download any IDE for Java, e.g., Eclipse, NetBeans, IntelliJ.
  3. Maven - Maven is an automation and open-source Java tool that helps download libraries from the Central Maven Repository. Download it from the Apache Maven website.

  4. IronPDF - Finally, IronPDF is required to create PDF files in Java. This needs to be added as a dependency in your Java Maven Project. Include the IronPDF artifact along with the slf4j dependency in the pom.xml file as shown below:

    <dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>
    <dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>
    XML

Adding Necessary Imports

First, add the following line at the top of the Java main class source code file to import all the required important class methods from the IronPDF library.

import com.ironsoftware.ironpdf.*;
import com.ironsoftware.ironpdf.*;
JAVA

Next, configure IronPDF with a valid license key to use its methods. Invoke the setLicenseKey method in the main method.

License.setLicenseKey("Your license key");
License.setLicenseKey("Your license key");
JAVA

Note: You can get a free trial license key from IronPDF to create and read PDFs.

Generate PDF Documents from HTML String

Creating PDF files from HTML string is very easy and usually takes one or two lines of code to do it. Here, an HTML code is written as a string in a variable and then passed to the renderHtmlAsPdf method found in the PdfDocument class. The following code generates a new PDF document instance:

// Create a string that contains HTML content
String htmlString = "<h1>Hello World!</h1><p>This is an example of an HTML string in Java.</p>";

// Generate a PDF document from the HTML string
PdfDocument pdf = PdfDocument.renderHtmlAsPdf(htmlString);
// Create a string that contains HTML content
String htmlString = "<h1>Hello World!</h1><p>This is an example of an HTML string in Java.</p>";

// Generate a PDF document from the HTML string
PdfDocument pdf = PdfDocument.renderHtmlAsPdf(htmlString);
JAVA

Now, use the saveAs method to save the generated PDF to a path on your local system:

// Save the generated PDF to the specified path
pdf.saveAs("htmlstring.pdf");
// Save the generated PDF to the specified path
pdf.saveAs("htmlstring.pdf");
JAVA

The above line of code creates a PDF called "htmlstring.pdf" containing the contents of the HTML string.

The output is as follows:

Java PDF Generator (Code Example Tutorial), Figure 1: HTML String to PDF Output HTML String to PDF Output

Create PDF Documents from HTML Files

The following code creates a PDF file from an HTML file:

// Convert an HTML file to a PDF document
PdfDocument myPdf = PdfDocument.renderHtmlFileAsPdf("example.html");

// Save the PDF document to the specified path
myPdf.saveAs("html_file.pdf");
// Convert an HTML file to a PDF document
PdfDocument myPdf = PdfDocument.renderHtmlFileAsPdf("example.html");

// Save the PDF document to the specified path
myPdf.saveAs("html_file.pdf");
JAVA

HTML file code:

<html>
    <head>
        <title>Example HTML File</title>
    </head>
    <body>
        <h1>HTML File Example</h1>
        <p style="font-style:italic;">This is an example HTML file</p>
    </body>
</html>
<html>
    <head>
        <title>Example HTML File</title>
    </head>
    <body>
        <h1>HTML File Example</h1>
        <p style="font-style:italic;">This is an example HTML file</p>
    </body>
</html>
HTML

In the above code, the renderHtmlFileAsPdf method generates PDF files from HTML files. This method accepts a string argument containing the path to the HTML file.

IronPDF renders the HTML file elements along with the CSS and JavaScript attached to it, if any. You can see in the output below that the CSS styling is also maintained by IronPDF, and the output is the same as it would have been in a web browser.

Java PDF Generator (Code Example Tutorial), Figure 2: HTML File to PDF Output HTML File to PDF Output

Generate PDF Files from URL

The renderUrlAsPdf method is used to create PDF files from a web page. It accepts the web page's URL as an argument.

// Generate a PDF document using a URL
PdfDocument urlToPdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com");

// Save the generated PDF to the specified path
urlToPdf.saveAs("urlToPdf.pdf");
// Generate a PDF document using a URL
PdfDocument urlToPdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com");

// Save the generated PDF to the specified path
urlToPdf.saveAs("urlToPdf.pdf");
JAVA

Java PDF Generator (Code Example Tutorial), Figure 3: URL to PDF Output URL to PDF Output

Additional rendering options can be set to configure PDF generation. You can get more information on the Convert URL to PDF Example Code.

Generating Password Protected PDF Files

IronPDF can be used to create a password-protected PDF file with the SecurityOptions class. All file permissions can be set if you integrate the PDF functionalities of IronPDF. The code goes as follows:

// Create security options and set a user password
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setUserPassword("shareable");
// Create security options and set a user password
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setUserPassword("shareable");
JAVA

setUserPassword is used to set a secure password. The below code sample applies password protection to the PDF document that was created in the URL to PDF example:

// Get the security manager of the PDF document and set the security options
SecurityManager securityManager = urlToPdf.getSecurity();
securityManager.setSecurityOptions(securityOptions);

// Save the protected PDF document to the specified path
urlToPdf.saveAs("protected.pdf");
// Get the security manager of the PDF document and set the security options
SecurityManager securityManager = urlToPdf.getSecurity();
securityManager.setSecurityOptions(securityOptions);

// Save the protected PDF document to the specified path
urlToPdf.saveAs("protected.pdf");
JAVA

The PDF file is now password protected. Now open the PDF file, and a password option will appear:

Java PDF Generator (Code Example Tutorial), Figure 4: Password Protected File Password Protected File

After entering the password correctly, the PDF document will open.

Java PDF Generator (Code Example Tutorial), Figure 5: PDF document PDF document

More security settings and metadata about the PDF files can be explored in the related Security and Metadata Code Example.

Summary

This article demonstrated the capability of the IronPDF library to create PDFs using multiple methods. IronPDF is a pure Java library and is powerfully built to easily work with PDF files in Java.

IronPDF's Engine makes it easy to create PDFs from various sources such as HTML files, image files, XML documents, Jasper reports, or any other input. It complies with the standard Java printing API, which facilitates document printing, and you can also digitally sign PDF files. IronPDF helps to get all the PDF-related tasks done quickly and easily.

IronPDF is not an open-source Java library. It provides a commercial license which starts from $799. You can also get a free trial of IronPDF to test it in production within your Java applications.

Preguntas Frecuentes

¿Cómo puedo generar un PDF desde una cadena HTML en Java?

Para generar un PDF desde una cadena HTML usando IronPDF, utilizas el método renderHtmlAsPdf de la clase PdfDocument. Una vez creado el PDF, usa el método saveAs para guardar tu documento.

¿Puedo crear un PDF desde un archivo HTML?

Sí, con IronPDF, puedes usar el método renderHtmlFileAsPdf de la clase PdfDocument para generar un PDF desde un archivo HTML proporcionando la ruta del archivo.

¿Cómo genero un PDF desde un URL?

IronPDF facilita la creación de un PDF desde el URL de una página web usando el método renderUrlAsPdf. Simplemente pasa el URL de la página web como argumento a este método.

¿Es posible proteger con contraseña los archivos PDF?

Sí, IronPDF te permite proteger con contraseña tus archivos PDF. Usa la clase SecurityOptions para establecer una contraseña de usuario con el método setUserPassword.

¿Cuáles son los requisitos previos para usar IronPDF en una aplicación Java?

Para crear archivos PDF en Java usando IronPDF, asegúrate de tener el Kit de Desarrollo de Java (JDK), un Entorno de Desarrollo Integrado (IDE), Maven, e IronPDF configurado como una dependencia de Maven.

¿IronPDF admite firmas digitales en PDFs?

Sí, IronPDF permite agregar firmas digitales a los archivos PDF, mejorando la seguridad del documento y asegurando su autenticidad.

¿IronPDF es una biblioteca Java de código abierto?

No, IronPDF es una biblioteca comercial de Java. Sin embargo, hay disponible una prueba gratuita que permite probar sus capacidades completas antes de la compra.

¿Cómo configuro IronPDF con una clave de licencia?

Para configurar IronPDF con una clave de licencia, invoca el método setLicenseKey en tu aplicación Java. Puedes obtener una clave de licencia a través de una prueba gratuita o adquiriéndola.

¿Cómo puedo preservar el formato HTML al generar PDFs en Java?

IronPDF mantiene el formato HTML al convertir HTML a PDF. Admite la estilización CSS y JavaScript, asegurando que el PDF renderizado se acerque mucho al diseño HTML original.

¿Qué métodos están disponibles para guardar un PDF generado usando IronPDF?

Una vez que has generado un PDF usando IronPDF, puedes guardarlo usando el método saveAs, especificando la ruta de archivo y nombre deseados para tu PDF.

Darrius Serrant
Darrius Serrant
  Chatea con el equipo de ingeniería ahora
Ingeniero de Software Full Stack (WebOps)

Darrius Serrant tiene una licenciatura en Ciencias de la Computación de la Universidad de Miami y trabaja como Ingeniero de Marketing WebOps Full Stack en Iron Software. Atraído por la programación desde joven, vio la computación como algo misterioso y accesible, convirtiéndolo en el ...

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