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">--${var.goodsName }<br /></c:forEach></c:forEach></body></html> |
注意事项：
JSTL1.1的库 在JSP2.0(Servlet 2.4)及以后(推荐用JSTL1.1及以上)用：
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<%@taglibprefix="c" uri="http://java.sun.com/jsp/jstl/core"%> |
web.xml
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<?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" ></web-app> |
在 Servlet2.3及以前，
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<%@taglibprefix="c" uri="http://java.sun.com/jstl/core"%> |
与2.4比较，以后版本路径少了jsp。
web.xml
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> </web-app> |
不然会出现以下错误：
org.apache.jasper.JasperException:/WEB-INF/jsp/shoppingCart.jsp(line: 10, column: 1) According to TLD or attribute directive in tag file,attribute items does not accept any expressions
springMVC的forEach不能正常显示
1、问题
在进行springMVC的forEach联系时,出现如下错误
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/index.jsp at line 12
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<table border="2" bgcolor="aqua" width="500px" > <c:forEach items="${list}" var="student"> <tr > <td height="50px">${student.id}</td> <td height="50px">${student.name}</td> </tr> </c:forEach> |
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
