如何判断session超时

<filter><filter-name>Session Timeout Filter</filter-name><filter-class>com.vstsoft.common.filter.SessionTimeoutFilter</filter-class><init-param><param-name>redirectURL</param-name><param-value>/loginOut.jsp</param-value></init-param><init-param><param-name>exceptFiles</param-name><param-value>/#/login.jsp#/loginOut.jsp</param-value></init-param><init-param><param-name>enable</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>Session Timeout Filter</filter-name><url-pattern>/*</url-pattern></filter-mapping> <session-config><session-timeout>30</session-timeout></session-config> 

把这段放到web.xml中就可以了

详细内容查看Session Timeout Filter