Choose unique values for the 'webAppRootKey' context-param in your web.xml files!
定義以後,在Web Container啟動時將把ROOT的絕對路徑寫到系統變數裡。
然後log4j的配置檔案裡就可以用${webName.root }來表示Web目錄的絕對路徑,把log檔案存放於webapp中。
此引數用於後面的“Log4jConfigListener”-->
<context-param><param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>webName.root</param-value>
</context-param>
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