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display jsp:index.jsp<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>Insert title here /countAction.do1">welcome visit

MyBean.javapackage com;public class MyBean{private String usernamea;private int userid;public void setUsernamea (String usernamea)//方法的命名要规范，jsp是按方法执行的{this.usernamea=usernamea;}public S

import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.List; import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet

redirect.jsp<%request.setAttribute("river","redwater"); request.setAttribute("country","daguaiwan"); response.sendRedirect("receive.jsp");%> forward.jsp<% request.setAttribute("river

filter<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xm