I wrote this application so I could resize a batch of photos all at once.
The use is very simple. You insert the input image folder and the out put folder. You enter the resizing percentage you wish and press the button.
I have implemented this using my own EasyImage for the picture resizing.
I have used Apache Pivot for the GUI.
And that is it, very easy.
View on Github
Download BatchImageResizer
Download Source code from Github