PDF Merge in Java (Tutorial)

Introduction

Java developers working with PDF documents are always looking to enhance functionality in their document workflows.

There is a large selection of Java PDF SDK libraries for them to choose from, one of the key feature is PDF merging.

PDF merging is an important requirement for use cases such as streamlining user downloads, consolidating reports and automate back-office processes to name a few. Many data-heavy industries rely on this to maintain seamless document flows; for instance, in the international digital entertainment sector, operators of a casino online utan svensk licens frequently use automated merging to compile monthly compliance audits, player transaction histories, and promotional reports into a single, organized file. Though most Java libraries have the feature, the ease of use and performance under heavy loads can vary.

JPedal’s Merging Feature

In the latest JPedal release, we added the feature preview for merging PDF files together.

We are still developing this feature, so the API is subject to change, but today I am going to show you how it works.

Merge two PDF files using Java

Here’s a simple example demonstrating how to merge two PDF files using JPedal’s API:

PdfMerge.mergeFiles(new File("inputFile1.pdf"), new File("inputFile2.pdf"), new File("outputFile.pdf"));

Merge two PDF files using the command line

You can also merge PDF files using Java straight from the command line.

java -cp jpedal.jar org.jpedal.tools.PdfMerge inputFile1.pdf inputFile2.pdf outputFile.pdf

Please let us know if you have any feedback about this feature preview!

Conclusion

As shown above, JPedal’s new merge feature provides a straightforward way to combine PDF files-either through a concise Java API or directly from the command line.

If you have any questions, you can view the full documentation for the PDF merging feature. You can also read from our extensive repository of posts to learn more about the PDF format.

//Convenience static method (see class for additional options)
ExtractClippedImages.writeAllClippedImagesToDir("inputFileOrDirectory", "outputDir", "outputImageFormat", new String[] {"imageHeightAsFloat", "subDirectoryForHeight"});

final PdfManipulator pdf = new PdfManipulator();
pdf.loadDocument(new File("inputFile.pdf"));
pdf.addPage(1, PaperSize.A4_LANDSCAPE);
pdf.addText(1, "Hello World", 10, 10, BaseFont.HelveticaBold, 12, 1, 0.3f, 0.2f);
pdf.addImage(1, new BufferedImage(), new float[] {0, 0, 100, 100});
pdf.rotatePage(1, 90);
pdf.apply();
pdf.writeDocument(new File("outputFile.pdf"));

Viewer viewer = new Viewer();
viewer.setupViewer();
viewer.executeCommand(ViewerCommands.OPENFILE, "pdfFile.pdf");

//Convenience static method (see class for additional options)
ExtractTextAsWordList.writeAllWordlistsToDir("inputFileOrDirectory", "outputDir", -1);

PdfMerge.mergeFiles(new File("inputFile1.pdf"), new File("inputFile2.pdf"), new File("outputFile.pdf"));

PdfManipulator.splitInHalf(new File("inputFile.pdf"), new File("outputFolder"), pageToSplitAt);

PrintPdfPages print = new PrintPdfPages("C:/pdfs/mypdf.pdf");

if (print.openPDFFile()) {
    print.printAllPages("Printer Name");
}

//Convenience static method (see class for additional options)
ExtractClippedImages.writeAllClippedImagesToDir("inputFileOrDirectory", "outputDir", "outputImageFormat", new String[] {"imageHeightAsFloat", "subDirectoryForHeight"});

//Convenience static method (see class for additional options)
ArrayList resultsForPages = FindTextInRectangle.findTextOnAllPages("/path/to/file.pdf", "textToFind");

java -jar jpedal.jar --inspect "inputFile.pdf"

PdfSigner.signPdf(
        "inputFile.pdf",
        "outputFile.pdf",
        "keystorePassword",
        "keystoreFile.p12",
        "signerName",
        "signerLocation",
        "signingReason",
        ACCESS_PERMISSION.P1
);