为什么我显示不了图书分类
package com.imooc.web.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
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 com.imooc.user.Category;
/**
* Servlet implementation class CategoryServlet
*/
@WebServlet("/category")
public class CategoryServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ServletContext context = request.getServletContext();
List clist = new ArrayList();
clist.add(new Category("ca001","计算机类"));
context.setAttribute("clist", clist);
request.getRequestDispatcher("/category.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书后台管理</title>
<link rel="stylesheet" href="css/index.css">
<link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<header>
<div class="container">
<nav>
<a href="bookList.html" >图书信息管理</a>
</nav>
<nav>
<a href="category.jsp" >分类管理</a>
</nav>
</div>
</header>
<section class="banner">
<div class="container">
<div>
<h1>图书管理系统</h1>
<p>图书分类管理</p>
</div>
</div>
</section>
<section class="main">
<div class="container">
<table class="table table-striped">
<thead>
<tr>
<th>序号</th>
<th>分类编号</th>
<th>分类名称</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<c:forEach items="${applicationScope.clist }" var="cate" varStatus="idx">
<tr>
<td>${idx.index+1 }</td>
<td>${cate.cid }</td>
<td>${cate.cname }</td>
<td><a href="/deleteCategory?categoryId=ca0001">删除</a></td>
<!--在循环显示数据时，此处的ca0001可以用EL表达式进行替换-->
</tr>
</c:forEach>
</tbody>
</table>
</div>
</section>
<section class="page">
<div class="container">
<div id="fatie">
<a href="addCategory.html"><button>新建</button></a>
</div>
</div>
</section>
<footer>
copy@慕课网
</footer>
</body>
</html>
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