Скачать или смотреть How to Fix a Blank PDF When Adding Images with PDFBox

Learn how to resolve the issue of a blank PDF when adding images using `PDFBox`. This guide provides a step-by-step solution to ensure your PDF retains its content.
---
This video is based on the question https://stackoverflow.com/q/63436366/ asked by the user 'zleepzzop' ( https://stackoverflow.com/u/8217185/ ) and on the answer https://stackoverflow.com/a/63502433/ provided by the user 'Lonzak' ( https://stackoverflow.com/u/2311528/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Adding an image to a pdf via pdfbox but after adding the pdf get blank

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix a Blank PDF When Adding Images with PDFBox

Adding images to PDF files using the PDFBox library in Java can be a bit challenging, especially if you encounter a blank PDF after incorporating an image. In this guide, we will dive into a common issue developers face when adding images to PDFs and provide a clear, structured solution to ensure your PDFs retain their original content.

Understanding the Problem

When trying to insert an image into an existing PDF document, many developers find that the output PDF shows only the image in one corner, while the original content of the PDF is completely blank. This can be quite frustrating, particularly when you have a well-structured document that you want to preserve.

This issue typically arises because the PDPageContentStream used for drawing images on the page incorrectly initializes the content stream. If you specify the wrong append mode, it fails to maintain the current content in the PDF, resulting in a blank page.

The Solution

To solve this problem, you need to adjust the way you initialize the PDPageContentStream. By changing the content stream to append to the existing content, you ensure that the current page layout remains intact. Here's how to do it:

Step-by-Step Implementation

Import Necessary Libraries: Make sure you have the required libraries imported in your Java file.

Creating the Image from Base64: Write a method to convert the base64 string to an image file.

Load Your Existing PDF: Read the PDF file where you want to add the image.

Use the Correct PDPageContentStream Constructor: Modify the initialization of PDPageContentStream to use the AppendMode.APPEND flag. This ensures that your existing content is preserved.

Revised Code Block

Here’s the modified code that addresses the blank PDF issue:

[[See Video to Reveal this Text or Code Snippet]]

Additional Notes

Keep File Paths Handy: Ensure your file paths for both the PDF and the image are correct to avoid FileNotFoundException.

Testing: After making these changes, test your application. You should now see the image added to the PDF without losing the existing content.

Error Handling: Implement try-catch blocks to gracefully handle potential IOExceptions or file-related issues.

Conclusion

Inserting an image into a PDF without losing its content can be accomplished by using the correct method for creating a PDPageContentStream. By following the steps outlined above, you can effectively add images while ensuring that the integrity of your PDF's content is maintained.

Feel free to experiment with different images and PDFs to familiarize yourself with PDFBox functionalities. Happy coding!