利用ServletContext对象获取web.xml中的全局参数

package com.yxfyg.servlet;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Servlet01 extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletContext context = getServletContext();
        String address = context.getInitParameter("address");
        System.out.println("address:" + address);
        System.out.println("=================");
        Enumeration<String> initParameterNames = context.getInitParameterNames();
        while (initParameterNames.hasMoreElements()) {
            String str = (String) initParameterNames.nextElement();
            String value = context.getInitParameter(str);
            System.out.println(str + ":" + value);
        }
    }
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    
}