题目内容
AwebapplicationusestheHttpSessionmechanismtodetermineifauserisloggedin”.Whenausersuppliesavalidusernameandpassword,anHttpSessioniscreatedforthatuser.Theuserhasaccesstotheapplicationforonly15minutesafterloggingin.Thecodemustdeterminehowlongtheuserhasbeenloggedin,andifthistimeisgreaterthan15minutes,mustdestroytheHttpSession.WhichmethodinHttpSessionisusedtoaccomplishthis?()
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