Java中设置session超时（失效）的三种方法

<!-- ==================== 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> 

<!-- 时间单位为分钟   -->
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<session-config> 
      <session-timeout>15</session-timeout> 
</session-config> 

session.setMaxInactiveInterval（30*60）;//以秒为单位