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

具体操作步骤如下：

1、创建Controller。

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 generateData(){
		 List inventories = new ArrayList();
		for(int i=0 ; i<2 ; i++){
			switch (i) {
			case 0:
				Inventory inventory1 = new Inventory();
				inventory1.setInventoryType("水果");
				List goodsList1 = new ArrayList(); 
				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 goodsList2 = new ArrayList(); 
				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。

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>  







	
		${item.inventoryType}

		  
		    
		    --${var.goodsName }

		    
	

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

在 Servlet2.3及以前，

<%@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

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