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