Currently, HTTP servers respond to each client request without relating that request to previous or subsequent requests; the technique allows clients and servers that wish to exchange state information to place HTTP requests and responses within a larger context, which we term a "session" . ---RFC2109Session中可以存放任何的对象,putValue(Sting,Object),将Object以String为Key存入Session中,因此getValue()返回Object
这问题我碰到过,肯定没错的