This jar file allows you to select a ".psd" file to dump to disk. It goes through a PSD, searching for all of the layers within it, and dumps them to disk, maintaining their position and keeping their background the same size as the PSD canvas.
To run, simply extract the lib folder and jar file to a folder, and run the jar (double click for windows/mac, or command line for linux). It will prompt you for the psd to dump.
I would recommend using Java 1.8_111 or greater, 64bit, otherwise you might run into memory issues or other weird behavior.