读取容器配置参数---context-param和init-param区别

context-param和init-param区别

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"));       } } 第一种参数在servlet里面可以通过getServletContext().getInitParameter("context/param")得到 第二种参数只能在servlet的init()方法中通过this.getInitParameter("param1")取得

FROM :http://hain.javaeye.com/blog/70731