How to Convert a Blob into a BufferedImage in Java?

How to Convert BufferedInputStream into an Image?

Original Question:

I'm having difficulty converting a blob into a buffered image. I'm retrieving a JPG image as a blob from my database, but the conversion to an image using BufferedImage returns null. How can I resolve this issue?

Solution:

• Verify that the uploadedInputStream contains a valid image by writing it out using ImageIO.write.
• Ensure that Blob#length returns a value compatible with Blob#getBytes. In this case, Blob#length returns a long, while Blob#getBytes expects an int, which could lead to truncation.
• Consider using getBinaryStream instead of getBytes to retrieve the blob contents, as getBinaryStream is more suitable for blobs that are not stored in memory.

Additional Considerations:

• The provided code does not handle the potential exception thrown by ImageIO.read. Ensure that the exception is handled gracefully or propagated to the caller.
• For further debugging, provide more information about the input data, such as its size and format.
• Refer to the documentation of the database library you're using to correctly retrieve and handle blobs.

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