<!-- ==================== Default Session Configuration ================= --> 
  <!-- You can set the default session timeout (in minutes) for all newly   --> 
  <!-- created sessions by modifying the value below.    --> 
    <session-config> 
        <session-timeout>30</session-timeout> 
</session-config> 

<!-- 時間單位為分鐘   -->
[html] view plaincopy
<session-config> 
      <session-timeout>15</session-timeout> 
</session-config> 

session.setMaxInactiveInterval（30*60）;//以秒為單位