获取Web应用初始化参数

package cn.itcast.web.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//通过servletContext,获取为web应用配置的初始化参数
public class ServletDemo7 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        //String value = this.getServletContext().getInitParameter("xxx");
        String url = this.getServletContext().getInitParameter("url");
        String username = this.getServletContext().getInitParameter("username");
        String password = this.getServletContext().getInitParameter("password");

        System.out.println(url);
        System.out.println(username);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

}