While embedding the PDF documents into a web application you may need to generate a thumbnail. In other scenarios, such as creating a PDF viewer, you may need to create a thumbnail for each page in the PDF. In this article, we will show you how to generate thumbnails of a PDF file programmatically in Java. We will explicitly cover how to create a thumbnail of a particular page or all the pages in a PDF file.
- Java API to Generate Thumbnails of PDF
- Generate a Thumbnail of a PDF File
- Generate Thumbnails of all Pages in PDF
Java API to Generate Thumbnails of PDF
To generate the thumbnails of PDF files, we will use Aspose.PDF for Java. It is a feature-rich library that lets you create and manipulate PDF documents. The API allows you to perform basic as well as advanced PDF automation operations seamlessly. You can download the API or install it using the following Maven configurations.
Repository:
<repository>
<id>AsposeJavaAPI</id>
<name>Aspose Java API</name>
<url>https://repository.aspose.com/repo/</url>
</repository>
Dependency:
<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-pdf</artifactId>
<version>22.4</version>
</dependency>Generate a Thumbnail of a PDF File in Java
Usually, you have to generate a single thumbnail image for a PDF document. The page for thumbnail could be the cover page or any other page of your choice. The following are the steps to generate a thumbnail of the desired page of a PDF in Java.
- Load the PDF file using the Document class.
- Get a reference of the desired page from the Document.getPages() collection.
- Create a new FileOutputStream for the image file.
- Create an instance of the Resolution class to set the resolution of the thumbnail image.
- Instantiate JpegDevice and set the height, width, resolution, and quality of the image.
- Generate thumbnail using JpegDevice.process(Page, FileOutputStream) method.
- Close the file stream.
The following code sample shows how to generate a thumbnail of a PDF file in Java.
Generate Thumbnails of all Pages in PDF in Java
The following are the steps to generate thumbnails for all the pages in PDF in Java.
- Load the PDF file using the Document class.
- Loop through all the pages in PDF using Document.getPages() collection.
- In each iteration, perform the following operations:
- Create a new FileOutputStream for the image file.
- Create an instance of the Resolution class to set the resolution of the thumbnail image.
- Instantiate JpegDevice and set the height, width, resolution, and quality of the image.
- Generate thumbnail using JpegDevice.process(Page, FileOutputStream) method.
- Close the file stream.
The following code sample shows how to generate thumbnails for all the pages in PDF.
Get a Free License
You can get a free temporary license in order to use Aspose.PDF for Java without evaluation limitations.
Conclusion
In this article, you have learned how to generate thumbnails for PDF files in Java. You have seen how to generate a thumbnail of a particular page or all the pages in a PDF file. Besides, you can explore more about the Java PDF API using the documentation. In case you would have any questions or queries, you can contact us via our forum.
