Creating a jpeg file with metadata

I have a Java application that creates a BufferedImage and saves it to disk as a JPEG. I'd really like to add a caption to the image. To prevent the image from getting crowded out by text on the image itself, it'd be great if I could write the caption to the JPEG's metadata.

I've been searching all over the place for a solution, but haven't found anything satisfactory. Sanselan comes up a lot, but I haven't figured out how to use it properly. I found examples that modify existing metadata, but my files don't conta开发者_运维百科in metadata as they are simply created from ImageIO.write() or Sanselan.writeImage().

I found another post that does what I'm looking for, but it's in C# and I need Java.

Any help would be greatly appreciated.

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the package you want to look at is javax.imageio.metadata

The IIOMetaData class (which has a concrete subclass for JPEG) contains methods to get metadata information in various formats, including as an XML DOM tree root node.