File APIs for Word/Excel/PowerPoint/PDF

  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 > ...

  In some document processing scenarios, PDF files often contain many images, such as scanned documents, product manuals, report attachments, contract images, and so on. Sometimes we need to extract images from a PDF for archiving, recognition, or further editing. In other cases, a PDF file may become too large because it contains high-resolution images, and image compression becomes necessary. This article uses demonstrate two common operations: Extract images from a PDF document in Java Compress high-quality images in a PDF document in Java 1. Preparation The sample code uses a Maven project. First, add the Spire.PDF for Java dependency to your pom.xml file. <repositories> <repository> <id> com.e-iceblue </id> <name> e-iceblue </name> <url> https://repo.e-iceblue.com/nexus/content/groups/public/ </url> </repository> </repositories> <dependencies> <dependency> ...