jsp->java 4 jsp发出类对象

bag1.jsp

<%@page import="Jbag.Bag"%>
<%
    Bag b = new Bag();
    b.i = 123;
    session.setAttribute("u",b);
    response.setHeader("refresh", "1;URL=bag2.jsp");
%>

其他部分：Jbag[][][][]Bag.java

package Jbag;

public class Bag {
public int i ;
    public String display1(){
        System.out.println("display1");
        return "display1";
    }
    public void display2(){
        System.out.println("display2");
    }
}