PDF Merger via Java

In order to merge PDF, we’ll use Aspose.PDF for Java API which is a feature-rich, powerful and easy-to-use concatenation API for Java platform. Our Java Library can convert a document from any supported download format to any supported save format. Aspose.PDF for Java library provides fairly universal solutions that will help you solve the tasks of converting documents. Aspose.PDF supports the largest number of popular document formats, both for loading and saving. Draw your attention that the current section describes only popular conversions. The current page provides information about converting format to format. However, there are many combinations for converting your files. For a complete list of supported formats, see the section Supported File Formats. You can download its latest version directly from Maven and install it within your Maven-based project by adding the following configurations to the pom.xml.

<repository>
    <id>AsposeJavaAPI</id>
    <name>Aspose Java AP</name>
    <url>https://releases.aspose.com/java/repo/</url>
</repository>

<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-pdf</artifactId>
<version>version of aspose-pdf API</version>
</dependency>

    // Open first document
    Document pdfDocument1 = new Document(dataDir + "Concat1.pdf");
    // Open second document
    Document pdfDocument2 = new Document(dataDir + "Concat2.pdf");

    // Add pages of second document to the first
    pdfDocument1.Pages.Add(pdfDocument2.Pages);

    dataDir = dataDir + "ConcatenatePdfFiles_out.pdf";
    // Save concatenated output file
    pdfDocument1.Save(dataDir);