修改 web.xml

<filter>



<filter-name>jfinal</filter-name>



<filter-class>com.jfinal.core.JFinalFilter</filter-class>



<init-param>



<param-name>configClass</param-name>



<param-value>demo.DemoConfig</param-value>



</init-param>



</filter>



<filter-mapping>



<filter-name>jfinal</filter-name>



<url-pattern>/*</url-pattern>



</filter-mapping>