On your method. For all web browsers they submit either GETs or POSTs anyway, so it is redundant.
Finally, it looks like you are using the older Spring 2.0 and before Controller interfaces rather than the more up to date approach of making your Controller's POJOs and not implementing a Spring interface or extending a Spring class.
Is this code that was already there??? It looks more like you are learning Spring now, and using dated materials to learn.