web.xml 学习小进步

web.xml里面可以定义两种参数： (1)application范围内的参数，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范围内的参数，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> 在servlet中可以通过代码分别取用： package com.wes.controller; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; public class MainServlet extends HttpServlet ...{     public MainServlet() ...{         super();      }     public void init() throws ServletException ...{          System.out.println("下面的两个参数param1是在servlet中存放的");          System.out.println(this.getInitParameter("param1"));          System.out.println("下面的参数是存放在servletcontext中的");          System.out.println(getServletContext().getInitParameter("context/param"));       } }