在Servlet中获取context-param和init-param内的参数

 

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:

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
public class MainServlet extends HttpServlet {
    public MainServlet() {
        super();
      }
    public void init(ServletConfig config) {
  
	// 在web.xml中设置的一个初始化参数
  
	System.out.println(
config.getInitParameter("param1"));
  
	System.out.println(
config.getServletContext().getInitParameter("context/param"));
  
	sc = config.getServletContext();
 
    }
}

 

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