這次專案只做了webservice，然後使用log4j記錄日誌，按照原來的方式放好了記錄日誌的類，放好了log4j.properties配置檔案，啟動專案，測試webservice，竟然沒有正常記錄日誌，提示：

log4j:WARN No appenders could be found for logger (SYSTEM_LOG).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

試過很多方法都不行，後來從網上查到，要強制載入log4j.properties配置檔案，試了一下果然可以了。

新增一個servlet：

public class Log4jConfig extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void destroy() {
		super.destroy();
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws

			ServletException, IOException {
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws

			ServletException, IOException {
	}

	public void init() throws ServletException {
		String prefix = getServletContext().getRealPath("/");
		String file = getInitParameter("log4j");
		if (file != null) {
			PropertyConfigurator.configure(prefix + file);
		}
	}
}
 

web.xml增加配置：

<!-- 強制載入log4j配置檔案 -->
	<servlet>
		<servlet-name>log4jConfig</servlet-name>
		<servlet-class>config.Log4jConfig</servlet-class>
		<init-param>
			<param-name>log4j</param-name>
			<param-value>WEB-INF\classes\log4j.properties</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
 

以此記錄