新增商品后总是出现goodsList cannot be resolved to a variable
package com.imooc.gim;
import java.io.IOException;
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;
/**
* Servlet implementation class GoodsAddServlet
*/
@WebServlet("/create")
public class GoodsAddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public GoodsAddServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String goodsId=request.getParameter("goodsId");
String goodsName=request.getParameter("goodsName");
String goodsType=request.getParameter("goodsType");
String price=request.getParameter("goodsPrice");
String goodsRemark=request.getParameter("description");
System.out.println(goodsId);
Goods goods = new Goods(Integer.parseInt(goodsId),goodsName,goodsType,Float.parseFloat(price),goodsRemark);
ServletContext context=request.getServletContext();
List goodsList=(List)context.getAttribute("goods");
goodsList.add(goods);
context.setAttribute("goods", goodsList);
request.getRequestDispatcher("/goods.jsp").forward(request, response);
}
}
package com.imooc.gim;
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;
/**
* Servlet implementation class GoodsAddServlet
*/
@WebServlet("/gl")
public class GoodsListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public GoodsListServlet() {
// TODO Auto-generated constructor stgaub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
ServletContext context=request.getServletContext();
if(context.getAttribute("goods")==null) {
List<Goods> goodsList=new ArrayList<>();
goodsList.add(new Goods(1001,"格力空调","家用电器",3000.00f,"铂金品质"));
goodsList.add(new Goods(1002,"LV","服装",18888.00f,"生活一场旅行"));
context.setAttribute("goods", goodsList);
}
request.getRequestDispatcher("/goods.jsp").forward(request, response);
}
}
package com.imooc.gim;
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;
/**
* Servlet implementation class GoodsAddServlet
*/
@WebServlet("/gl")
public class GoodsListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public GoodsListServlet() {
// TODO Auto-generated constructor stgaub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
ServletContext context=request.getServletContext();
if(context.getAttribute("goods")==null) {
List<Goods> goodsList=new ArrayList<>();
goodsList.add(new Goods(1001,"格力空调","家用电器",3000.00f,"铂金品质"));
goodsList.add(new Goods(1002,"LV","服装",18888.00f,"生活一场旅行"));
context.setAttribute("goods", goodsList);
}
request.getRequestDispatcher("/goods.jsp").forward(request, response);
}
}
//goods.jsp
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>商品列表</title>
<link href="css/bootstrap.css" type="text/css" rel="stylesheet">
</link>
<script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="js/bootstrap.js"></script>
<style type="text/css">
.pagination {
margin: 0px
}
.pagination>li>a,
.pagination>li>span {
margin: 0 5px;
border: 1px solid #dddddd;
}
.glyphicon {
margin-right: 3px;
}
.form-control[readonly] {
cursor: pointer;
background-color: white;
}
#dlgPhoto .modal-body {
text-align: center;
}
.preview {
max-width: 500px;
}
</style>
<script>
$(function () {
$("#btnAdd").click(function () {
$('#dlgForm').modal()
});
})
</script>
</head>
<body>
<div class="container">
<div class="row">
<h1 style="text-align: center">IMOOC商品信息表</h1>
<div class="panel panel-default">
<div class="clearfix panel-heading ">
<div>
<label class="form-inline">
<div class="form-group" style="width: 850px;">
<button class="btn btn-primary" id="btnAdd">新增
</button>
</div>
<div class="form-group pull-right">
<form action="#" method="post">
<input type="text" class="form-control" id="searchById" name="id" placeholder="根据商品id进行查询">
<button type="submit" class="btn btn-primary">查询</button>
</form>
</div>
</label>
</div>
<table class="table table-bordered table-hover">
<thead>
<tr>
<th>序号</th>
<th>商品编号</th>
<th>商品名称</th>
<th>商品类别</th>
<th>价格</th>
<th>备注</th>
<th> </th>
</tr>
<c:forEach items="${applicationScope.goods}" var ="good" varStatus="idx">
<tr>
<th>${idx.index+1}</th>
<th>${good.goodsId}</th>
<th>${good.goodsName}</th>
<th>${good.goodsType}</th>
<th>价格</th>
<th>${good.goodsRemark}</th>
<th> </th>
</tr>
</c:forEach>
</thead>
</table>
</div>
</div>
</div>
<!-- 表单 -->
<div class="modal fade" tabindex="-1" role="dialog" id="dlgForm">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>
</button>
<h4 class="modal-title">新增商品</h4>
</div>
<div class="modal-body">
<form action="/Gim/create" method="post">
<div class="form-group">
<label>商品编号</label>
<input type="text" name="goodsId" class="form-control" id="empno" placeholder="请输入商品编号">
</div>
<div class="form-group">
<label>商品名称</label>
<input type="text" name="goodsName" class="form-control" id="ename" placeholder="请输入商品名称">
</div>
<div class="form-group">
<label>商品类别</label>
<select id="gname" name="goodsType" class="form-control">
<option selected="selected">服装</option>
<option value="家用">家用电器</option>
<option value="生活">生活用品</option>
</select>
</div>
<div class="form-group">
<label>价格</label>
<input type="text" name="price" class="form-control" id="sal" placeholder="请输入价格">
</div>
<div class="form-group">
<label>备注</label>
<input type="text" name="description" class="form-control" id="sal" placeholder="请输入备注">
</div>
<div class="form-group" style="text-align: center;">
<button type="submit" class="btn btn-primary">保存</button>
</div>
</form>
</div>
</div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->
</div><!-- /.modal -->
</body>
</html>Description Resource Path Location Type
goodsList cannot be resolved to a variable GoodsAddServlet.java /Gim/src/main/java/com/imooc/gim line 51 Java Problem
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1回答
同学你好，需要同学提供一下Goods类代码。
祝学习愉快~
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