1​.​​使​用​S​p​r​i​n​g​​S​e​c​u​r​i​t​y​管​理​用​户​身​份​认​证​、​登​录​退​出​​​2​.​​用​户​密​码​加​密​及​验​证​​​3​.​​采​用​数​据​库​的​方​式​实​现​S​p​r​i​n​g​​S​e​c​u​r​i​t​y​的​r​e​m​e​m​b​e​r​-​m​e​功​能​​​4​.​​获​取​登​录​用​户​信​息