以上是我正在嘗試創(chuàng)建的內容你好，以上是我嘗試使用 Spring Boot 創(chuàng)建的內容。我的問題是如何正確地迭代 forEach 循環(huán)并提取 JSP 中所需的必要數(shù)據(jù)？我以為我做得正確，但是，我不斷收到錯誤消息“不知道如何迭代 <forEach> 中提供的“items””請參閱下面的代碼了解我目前正在做什么。提前感謝您的幫助！控制器@RequestMapping(value = "/showOrders.html") public String listOrders(Model model) { ArrayList<Order> orders = os.findAll(); model.addAttribute("allOrders", orders); return "allOrders"; }“訂單”的服務類別package com.sales.services;import java.util.ArrayList;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.sales.models.Order;import com.sales.repositories.OrderRepository;@Servicepublic class OrderService { @Autowired OrderRepository or; public ArrayList<Order> findAll() { return (ArrayList<Order>) or.findAll(); }}訂單的存儲庫類package com.sales.repositories;import java.util.ArrayList;import java.util.List;import org.springframework.data.jpa.repository.Query;import org.springframework.data.repository.CrudRepository;import org.springframework.data.repository.query.Param;import org.springframework.stereotype.Repository;import com.sales.models.Customer;import com.sales.models.Order;@Repositorypublic interface OrderRepository extends CrudRepository<Order, Long> {}
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下面是這個問題的解答
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<link href="/css/style.css" rel="stylesheet"></link>
<head>
<meta charset="ISO-8859-1">
<title>List of Customers</title>
</head>
<body>
<h1>List of Customers</h1>
<c:forEach items="${ordrs}" var="ords">
<c:forEach items="${ords.orders}" var="order">
<b>${order.oId} </b>
<table>
<tr>
<th>Quantity</th>
<th>Order Date</th>
<th>Customer ID</th>
<th>Customer Name</th>
<th>Product ID</th>
<th>Description</th>
</tr>
<tr>
<td>${order.qty}</td>
<td>${order.orderDate}</td>
<td>${ords.cId}</td>
<td>${ords.cName}</td>
<td>${order.prod.pId}</td>
<td>${order.prod.pDesc}</td>
</tr>
</table>
</c:forEach>
</c:forEach>
</body>
</html>
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