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解析web.xml中在Servlet中獲取context-param和init-param內的參數

web.xml裡面可以定義兩種參數:
1.application范圍內的參數,存放在servletcontext中,在web.xml中配置如下:

復制代碼 代碼如下:
<context-param>
           <param-name>context/param</param-name>
           <param-value>avalible during application</param-value>
  </context-param>


2.servlet范圍內的參數,只能在servlet的init()方法中取得,在web.xml中配置如下:

復制代碼 代碼如下:
<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中可以通過代碼分別取用:

復制代碼 代碼如下:
package com.qisentech.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(this.getInitParameter("param1"));
          System.out.println(getServletContext().getInitParameter("context/param"));
       }
}


第一種參數在servlet裡面可以通過getServletContext().getInitParameter("context/param")得到
第二種參數只能在servlet的init()方法中通過this.getInitParameter("param1")取

 
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