File APIs for Word/Excel/PowerPoint/PDF

  When working with PowerPoint files in a Java application, you may sometimes need to split a large presentation into smaller files. For example, you might have a training deck that contains several chapters and want to save each chapter as a separate presentation. Or you may need to export every slide as an individual PPTX file so the slides can be reviewed, archived, or reused separately. Doing this manually in PowerPoint is fine for a few slides, but it quickly becomes tedious when the file contains dozens or hundreds of slides. A better approach is to handle the process programmatically: load the original PowerPoint file, copy the required slides, and save them as new PPTX documents. This article shows two common ways to split a PowerPoint document in Java: Split a presentation into one file per slide. Split a presentation by a specified slide range. Install the PowerPoint Processing Library Java does not provide a built-in API for editing PowerPoint files, so this example uses...

  When working with contracts, reports, notices, certificates, or other PDF files, the document layout often matters just as much as the content. For example, you may want to add a soft background color to a report, apply a company letterhead to a contract, or place a fixed template image behind an official document. Doing this manually is fine for one or two files, but it quickly becomes inefficient when the files need to be processed in batches. A better approach is to handle the PDF background directly in Java code. This article shows two common ways to change the background of a PDF file in Java: adding a background color and setting a background image. 1. Add the Java PDF Library In this example, we will use Spire.PDF for Java to load an existing PDF document, update the background of its pages, and save the result as a new PDF file. If your project uses Maven, add the Spire.PDF dependency to your pom.xml file: <repositories> <repository> < id > ...