There’s a case that the user change the parameters send to servlet through URL,
is there’s any way to restrict user not to change paramters,
if not, how can I manage all parameters send to servlets? in a case they are many, is it reasonable to check each one in turn??
You can’t restrict the user from sending you anything.
It is the server-side where you can add restrictions.
Usually you get only the parameters you need, so additional parameters should not bother you.