1. Web container settings
For example, the daily use of tomcat is set in web.xml
<session-config>
<session-timeout>15</session-timeout>
</session-config>
2. Project webxml
<session-config>
<session-timeout>15</session-timeout>
</session-config>
3. Set in Java code
session.setMaxInactiveInterval(30*60);//in seconds
The priority is 1<2<3