单选题In your web application，you need to execute a block of code whenever the session object is first created. Which design will accomplish this goal？（）ACreate an HttpSessionListener class and implement the sessionInitialized method with that block ofcode.BCreate an HttpSessionActivationListener class and implement the sessionCreated method with thatblock of code.CCreate a Filter class， call the getSession（false） method， and if the result was null， then execute that block of code.DCreate an HttpSessionListener class and implement the sessionCreated method with that block of code.
单选题
In your web application，you need to execute a block of code whenever the session object is first created. Which design will accomplish this goal？（）
A
Create an HttpSessionListener class and implement the sessionInitialized method with that block ofcode.
B
Create an HttpSessionActivationListener class and implement the sessionCreated method with thatblock of code.
C
Create a Filter class， call the getSession（false） method， and if the result was null， then execute that block of code.
D
Create an HttpSessionListener class and implement the sessionCreated method with that block of code.
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