web.xml裡面可以定義兩種引數：(1)application範圍內的引數，存放在servletcontext中，在web.xml中配置如下： <context-param> <param-name>context/param</param-name> <param-value>avalible during application</param-value> </context-param>(2)servlet範圍內的引數，只能在servlet的init()方法中取得，在web.xml中配置如下： <servlet> <servlet-name>MainServlet</servlet-name> <servlet-class>com.wes.controller.MainServlet</servlet-class> <init-param> <param-name>param1</param-name> <param-value>avalible in servlet init()</param-value> </init-param> <load-on-startup>0</load-on-startup> </servlet>