需要在你的web.xml中定義如下：
??? <servlet>
??????? <servlet-name>jsp</servlet-name>
??????? <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
??????? <init-param>
??????????? <param-name>fork</param-name>
??????????? <param-value>false</param-value>
??????? </init-param>
??????? <init-param>
??????????? <param-name>xpoweredBy</param-name>
??????????? <param-value>false</param-value>
??????? </init-param>
??????? <load-on-startup>3</load-on-startup>
??? </servlet>
??? <servlet-mapping>
??????? <servlet-name>jsp</servlet-name>
??????? <url-pattern>*.jsm</url-pattern>
??? </servlet-mapping>