为什么结果输出是空？

来源：1-12 自由编程

qq_慕移动0378797

2019-11-19 19:37:26

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>编号:${requestScope.Course.id }</h1>
	<h2>名字:${requestScope.Course.name} </h2>
	<h2>方向:${requestScope.Course.category }</h2>
	
</body>
</html>
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 CourseServlet
 */
@WebServlet("/CS")
public class CourseServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CourseServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		Course course=new Course();
		course.setId("10086");
		course.setName("语文");
		course.setCategory("文学");
		request.setAttribute("course", course);
		request.getRequestDispatcher("/demo.jsp").forward(request, response);
		
	}

}
package com.imooc.el;

public class Course {
	private String id;
	private String name;
	private String category;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getCategory() {
		return category;
	}
	public void setCategory(String category) {
		this.category = category;
	}
	@Override
	public String toString() {
		return "Coures[couseid:"+name+",coursename:"+id+",category:"+category+"]";
	}
}

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