Spring MVC使用jstl 标签c:forEach 遍历输出双层嵌套List的数据方式

Spring MVC jstl 标签c:forEach 遍历输出双层嵌套List数据

具体操作步骤如下：

1、创建Controller

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									import java.util.ArrayList;

									import java.util.List; 

									import javax.servlet.http.HttpServletRequest;

									import javax.servlet.http.HttpServletResponse; 

									import org.springframework.stereotype.Controller;

									import org.springframework.ui.Model;

									import org.springframework.web.bind.annotation.RequestMapping; 

									import com.mahaochen.springmvc.domain.Goods;

									import com.mahaochen.springmvc.domain.Inventory;

									@Controller

									@RequestMapping("/shop")

									public class ShoppingController { 

									 @RequestMapping("/shoppingCart")

									 public String getShoppingCart(HttpServletRequest request,  HttpServletResponse response,Model model){  

									  model.addAttribute("list", generateData());  

									  return "shoppingCart";

									 }

									 private List<Inventory> generateData(){

									   List<Inventory> inventories = new ArrayList<Inventory>();

									  for(int i=0 ; i<2 ; i++){

									   switch (i) {

									   case 0:

									    Inventory inventory1 = new Inventory();

									    inventory1.setInventoryType("水果");

									    List<Goods> goodsList1 = new ArrayList<Goods>(); 

									    for(int j=0;j<5;j++){

									     Goods goods = new Goods();

									     goods.setGoodsName("苹果"+j);

									     goodsList1.add(goods);

									    }

									    inventory1.setGoodList(goodsList1);

									    inventories.add(inventory1);

									    break;

									   default:

									    Inventory inventory2 = new Inventory();

									    inventory2.setInventoryType("蔬菜");

									    List<Goods> goodsList2 = new ArrayList<Goods>(); 

									    for(int j=0;j<5;j++){

									     Goods goods = new Goods();

									     goods.setGoodsName("茄子"+j);

									     goodsList2.add(goods);

									    }

									    inventory2.setGoodList(goodsList2);

									    inventories.add(inventory2);

									    break;

									   }

									  }

									  return inventories;

									 }

									}

2、创建对应的jsp页面

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									<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

									<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 

									<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

									<html>

									<head>

									<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

									<title>购物车</title>

									</head>

									<body>

									<c:forEach items="${list }" var="item">

									${item.inventoryType}<br />

									<c:set value="${item.goodList }" var="subItem"/>

									<c:forEach items="${subItem }" var="var">

									--${var.goodsName }<br />

									</c:forEach>

									</c:forEach>

									</body>

									</html>

注意事项：

JSTL1.1的库　在JSP2.0(Servlet 2.4)及以后(推荐用JSTL1.1及以上)用：

				?

									<%@taglibprefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

web.xml

				?

									<?xml version="1.0" encoding="UTF-8"?>

									<web-app version="2.4"

									         xmlns="http://java.sun.com/xml/ns/j2ee"

									         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

									         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

									</web-app>

在 Servlet2.3及以前，

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									<%@taglibprefix="c" uri="http://java.sun.com/jstl/core"%>

与2.4比较，以后版本路径少了jsp。

web.xml

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									<?xml version="1.0" encoding="UTF-8"?>  

									<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">  

									<web-app>        

									</web-app>

不然会出现以下错误：

org.apache.jasper.JasperException:/WEB-INF/jsp/shoppingCart.jsp(line: 10, column: 1) According to TLD or attribute directive in tag file,attribute items does not accept any expressions

springMVC的forEach不能正常显示

1、问题

在进行springMVC的forEach联系时,出现如下错误

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/index.jsp at line 12

				?

									<table border="2" bgcolor="aqua" width="500px" >

									     <c:forEach items="${list}" var="student">

									     <tr >

									         <td height="50px">${student.id}</td>

									        <td height="50px">${student.name}</td>

									     </tr>

									    </c:forEach>