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有人能够向我简要介绍一下如何传递一个对象并在稍后的JSP中使用它。在使用Servlets和JSP的会话中使用对象
我有这个servlet，有能力创建一个新对象并将它存储到会话中。
package application.servlets.test;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import application.data.character.House;
/**
*
* Servlet implementation class SessionTest
*/
@WebServlet("/persons")
public class SessionTest extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public SessionTest() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
House house = new House(34);
HttpSession session = request.getSession();
session.setAttribute("House", house);
request.getRequestDispatcher("test.jsp").forward(request, response);
}
}
这是我转发到Servlet中的第一个JSP：
<html>
<body>
<h2>Hello World!</h2>
<form method="post" action="persons">
<input type="submit", value="Submit"/>
</form>
</body>
</html>
最后servlet将转发我这个JSP。我现在如何显示它的JSP getLevel（）方法。或者任何会在House中的方法？我如何打印出这些值？
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Hello this is just a test
<h1>Hello ${sessionScope.House}!!!</h1>
<% Object o = session.getAttribute("House");
%>
</body>
</html>
只是为了万一这是我的房子类：
package application.data.character;
public class House {
private int level;
public House(int level) {
super();
this.level = level;
}
public int getLevel() {
return level;
}
public void setLevel(int level) {
this.level = level;
}
}