java web application package struct

before, i use controller service dao domain in my javaweb application.But recently i realize i need more package to place my object. For example:

1. i may create a new object to bind data from request, it may contains a string array to delete the record in database or some field to query some records.

2. sometimes,service may return a new object contain the useful message ,it may contains the success count,fail count and so on.

   so i need package to place them,do you have any idea ? thank u.