web.xml与log4j相关的配置

<context-param>
	<param-name>webAppRootKey</param-name>
	<param-value>petstore.root</param-value>
</context-param>

<context-param>
	<param-name>log4jConfigLocation</param-name>
	<param-value>/WEB-INF/log4j.properties</param-value>
</context-param>