Java에서 PDF 파일을 보는 방법

1. IronPDF for Java

IronPDF for Java is a powerful and feature-rich library that enables developers to effortlessly create, edit, and manipulate PDF documents within their applications. With IronPDF, developers can generate PDF files from HTML, URLs, and other sources, apply formatting and styling, add pictures, tables, and text, as well as perform advanced operations such as merging multiple PDFs in Java, splitting PDF documents in Java, and encrypting PDFs for security.

2. Prerequisites

To utilize a Java viewer with IronPDF, certain prerequisites must be met. Ensure that you have the following:

1. Java Installation: Verify that Java is installed on your system and that its path is set in the environment variables. If you haven't installed Java yet, you can find installation instructions from this Java website.
2. Java IDE: Install a Java Integrated Development Environment (IDE) such as Eclipse IDE download page or IntelliJ IDEA download section.
3. IronPDF Library: Download the IronPDF library and add it as a dependency in your project using the command line. Instructions for setting up the IronPDF library can be found on the IronPDF official website.
4. Maven Installation: Install Maven from Apache before starting the PDF conversion process.

3. Create a New Java Maven Project

For this tutorial, it is recommended to use IntelliJ IDE. However, please note that you can use any IDE of your choice. Keep in mind that the process of creating a new Java project may vary slightly depending on the IDE you are using.

1. Launch the IntelliJ IDE, or go to an already opened instance of IntelliJ.

2. Hover on File > New > Project.

   IntelliJ

3. Enter Project Title name.
4. Choose a location, a build system, and a JDK.
5. Click on Finish as shown in the below image.

Create Project

<dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf-java</artifactId>
    <version>2023.9.1</version> 
</dependency>

<dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf-java</artifactId>
    <version>2023.9.1</version> 
</dependency>

4. Creating and Viewing PDF Document in Default PDF Viewer

Now create a new Java file in src > main > java.

First, import the required references that are important for creating and viewing PDF files in this Java application.

import com.ironsoftware.ironpdf.License;
import com.ironsoftware.ironpdf.PdfDocument;

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

import com.ironsoftware.ironpdf.License;
import com.ironsoftware.ironpdf.PdfDocument;

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

These imports are important because they will help the Java program to execute the desired logic.

Now let's write the example code that will create the PDF document and implement the document viewer logic to open the created PDF file in the PDF Viewer.

public class Main {
    public static void main(String[] args) throws IOException {
        // Use IronPDF to create a PDF document from a URL
        PdfDocument pdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com/");

        // Save the PDF document to the local file system
        pdf.saveAs(Paths.get("html_saved.pdf"));

        // Create a new file object for the saved PDF
        File file = new File("html_saved.pdf");

        // Check if the desktop is supported and the file exists, then open the PDF
        if (Desktop.isDesktopSupported() && file.exists()) {
            Desktop desktop = Desktop.getDesktop();
            desktop.open(file);
        }
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        // Use IronPDF to create a PDF document from a URL
        PdfDocument pdf = PdfDocument.renderUrlAsPdf("https://ironpdf.com/");

        // Save the PDF document to the local file system
        pdf.saveAs(Paths.get("html_saved.pdf"));

        // Create a new file object for the saved PDF
        File file = new File("html_saved.pdf");

        // Check if the desktop is supported and the file exists, then open the PDF
        if (Desktop.isDesktopSupported() && file.exists()) {
            Desktop desktop = Desktop.getDesktop();
            desktop.open(file);
        }
    }
}

The above code will create a PDF file using PdfDocument.renderUrlAsPdf, which takes a URL as an input stream and returns a PDF file as output. After that, instantiate a new File object using the same PDF document. Then, the desktop.open(file) will be used to open the PDF file in the default PDF Viewer.

PDFs created using IronPDF can be printed. They also load all the pages perfectly with all the images intact and URLs are also clickable. An example output of the PDF file screenshot is attached in the default PDF Viewer.

PDF Output

5. Conclusion

A Java PDF Viewer is a valuable tool that allows users to view, print, and interact with PDF files within a Java environment. It provides features such as rendering, navigation, searching, and annotation support, making it easier for users to access and analyze PDF content. IronPDF for Java is a robust library that empowers developers to effortlessly create, edit, and manipulate PDF documents.

With its extensive set of APIs and functionalities, IronPDF enables seamless integration of PDF generation and manipulation capabilities into Java applications. By following the steps to create a new Java project and setting up the environment, developers can leverage IronPDF to create and view PDF documents in the default PDF viewer. This offers advantages such as cross-platform compatibility, customization options, efficient performance, and enhanced security. With IronPDF for Java, developers can generate professional-grade PDF documents with ease and provide a seamless viewing experience for users.

Read our tutorial to learn how to use IronPDF to convert HTML to PDF files in Java.