为什么输出为空
来源：1-12 自由编程
RitataDang
2020-02-24 11:35:53
package com.imooc.el.prctise;
public class Course {
private String name;
private String category;
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 "课程名称：" + name + ", 所属方向：" + category ;
}
}
package com.imooc.el.prctise;
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("/cou")
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 {
//String teacher=request.getParameter("teacher");
Course course=new Course();
course.setName("计算机组成原理");
course.setCategory("计算机科学与技术");
request.setAttribute("course", course);
request.getRequestDispatcher("/demo.jsp").forward(request, response);
}
}
<%@ 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>课程名：${course.name }</h1>
<h2>所属方向：${course.category }</h2>
<h2>授课教师：${param.teacher }</h2>
<h2>概要：${course }</h2>
</body>
</html>
1回答
-
好帮手慕柯南
2020-02-24
同学你好！
这是正常现象，你直接访问jsp页面传递的参数就只有teacher，所以显示出来的只是teacher的值
如果你想显示其它值，应该访问Servlet，比如：http://localhost:8080/el/cou
如果我的回答解决了你的疑惑，请采纳，祝学习愉快~
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