Preparable or interceptors

[Mansour]

I am trying to perform some operation on an object, Therefore I need to 
pass to the action the object id and the parameters to add for the 
operation. I need to set these values before the request reaches the 
action class.  Do I do this in the interceptor, or just implement 
Preperable and ServletRequestAware interfaces ?

What is the difference between these two methods?


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