Implementing dropzone.js in java

Implementing dropzone.js in java

im using http://www.dropzonejs.com/ in a java web project. The problem is
that i cant find out how to handle the file in the server side. There are
some examples but they are in php and other languajes. Here is one of the
examples:
http://www.startutorial.com/articles/view/how-to-build-a-file-upload-form-using-dropzonejs-and-php
Thank you!