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;
}
}
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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>
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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：
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<%@taglibprefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
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web.xml
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<?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>
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在 Servlet2.3及以前，
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<%@taglibprefix="c" uri="http://java.sun.com/jstl/core"%>
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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>
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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
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<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>
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2、解决
forEach的获取是通过getter来进行的，在实体类中添加getter方法即可。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/mahoking/article/details/53265942