jsp代码：

<%-- 和pageContext.include()一样效果，动态包含--%>	
    

jsp代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>                
      

PS:因为web.xml中配置首页只能是jsp, 而首页往往需要servlet处理数据，所以就在首页index.jsp中使用来转发到servlet。

jsp代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>            	<%		int x = 10;	 %>		
    		
     		
     		
     	
      

Servlet代码：

public class ServletDemo1 extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		String username = request.getParameter("username");		System.out.println(username);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doGet(request, response);	}}