为什么没有获取到值

来源：1-1 初识EL表达式

薛定谔的猫迷

2019-08-23 10:49:15

package com.imooc.el;

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;

/**
 * Servlet implementation class StudentServlet
 */
@WebServlet("/info")
public class StudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public StudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		Student stu= new Student();
		stu.setName("张三");
		stu.setMobile(null);
		String grade="A";
		request.setAttribute("grade",grade);
		request.setAttribute("student",stu);
		request.getRequestDispatcher("/info.jsp").forward(request, response);
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

	}
	
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="com.imooc.el.Student"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		Student stu=(Student)request.getAttribute("student");
		String grade = (String)request.getAttribute("grade");
	 	out.println("<h1>姓名："+stu.getName()+"</h1>");
		out.println("<h2>电话："+stu.getMobile()+"</h2>");
		out.println("<h2>评级："+grade+"</h2>");		
	%>

</body>
</html>

package com.imooc.el;

public class Student {
	String name;
	String mobile;
//	public Student(String name, String mobile) {
//		this.name = name;
//		this.mobile = mobile;
//	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getMobile() {
		return mobile;
	}
	public void setMobile(String mobile) {
		this.mobile = mobile;
	}
	
}

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