老师这个需要怎么判断
<%@page import="java.util.List"%> <%@page import="com.imooc.model.Food"%> <%@page import="com.imooc.model.FoodDaoImpl"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE html> <html> <head> <base href="<%=basePath%>"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>菜品信息展示</title> <style type="text/css"> </style> </head> <body> <% List<Food> food=(List<Food>)application.getAttribute("food"); List<Food> list=(List<Food>)application.getAttribute("list"); if(food==null){ application.setAttribute("foodList", list); }else{ application.setAttribute("foodList", food); } %> <center> <h1>菜品查询</h1> <font><h3 style="color:red">${msg }</h3></font> <table border="1px" cellspacing="0px" cellpadding="0px" width="800px"> <thead> <tr> <th>菜品ID</th> <th>菜名</th> <th>口味</th> <th>菜品图片</th> <th>价格</th> <th>菜品描述</th> </tr> </thead> <tbody> <c:forEach items="${applicationScope.foodList }" var="food"> <tr> <td>${food.fid }</td> <td>${food.fname }</td> <td>${food.lavor }</td> <td><img src="/variety_of_dishes/upload/${food.imgaddress }"></td> <td>${food.peice }</td> <td>${food.describe }</td> </tr> </c:forEach> </tbody> </table> </center> </body> </html>
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