カート動いた

取り急ぎ動いたので送っておきます。

1,フィールド追加
Item.java(Beanbs)

2,新規作成ファイル
Cartitem.Java(Beanbs)

3,Post記述追加
CartServlet.Java

4,新規作成ファイル
cartLogic.java

5,新規作成ファイル
CartDAO.Java

6新規作成ファイル
cartCheck.jsp



フィールド追加
Item.java(Beanbs)

package model;

public class Item {
	private String category;
	private String name;
	private String explanation;
	private String image_path;
	private String image_path2;
	private String image_path3;
	private int price;
	private int quantity;
	private int cart_quantity;//追加＊カートに入っている個数を取ってくるのに必要でした。
	
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新規作成ファイル＊List<Item>はあまり機能してない感じです。CartServletでもっとうまく使えそうなきがします。
Cartitem.Java(Beanbs)

package model;

import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.List;


public class CartItem implements Serializable {
	
	private List<Item> cart2Item;
	private LinkedHashMap<String, Integer> cartMap;
	

	public CartItem () {}
	
	
	public List<Item> getCart2Item() {
		return cart2Item;
	}
	public void setCart2Item(List<Item> cart2Item) {
		this.cart2Item = cart2Item;
	}

	public LinkedHashMap<String, Integer> getCartMap() {
		return cartMap;
	}

	public void setCartMap(LinkedHashMap<String, Integer> cart) {
		this.cartMap = cart;
	}



}

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Post記述追加
CartServlet.Java

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		System.out.println("CartServlet内post");
		HttpSession session =request.getSession();
		LinkedHashMap<String, Integer> cart = (LinkedHashMap<String, Integer>) session.getAttribute("cart");
		
		System.out.println("cart"+cart);
		CartItem cartItems = new CartItem();
		
		//CartItemBeansのMapにセッションで持ってきたカート情報を代入
		cartItems.setCartMap(cart);
		CartLogic c = new CartLogic();
		List<Item> cartList = c.execute(cartItems);
		System.out.println("cartItem55"+ cartItems.getCart2Item());
	
		session.setAttribute("cartList", cartList);
		session.setAttribute("cartItems", cartItems);//とりあえずSessoinに入れて見ましたが取り出せないです。
		System.out.println("ccartItems"+ cartItems);
		System.out.println("cartItems.getCart2Item()"+ cartItems.getCart2Item());
		RequestDispatcher dispatcher = request.getRequestDispatcher("/WEB-INF/jsp/cart/cartCheck.jsp");
		dispatcher.forward(request, response);
	}

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新規作成ファイル※無理やり動いた感じでしっくりきていませんw
cartLogic.java

package model;

import java.util.List;

import dao.CartDAO;

public class CartLogic {
	
	public List<Item> execute(CartItem Jbk) {
		System.out.println(" CartLogic");
	CartDAO dao = new CartDAO();
	Jbk.setCart2Item(dao.findCart(Jbk));
	return Jbk.getCart2Item();
	}

}


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新規作成ファイル
CartDAO.Java

public class CartDAO {
	private final String JDBC_URL="jdbc:mysql://localhost:3306/haynth?characterEncoding=UTF-8&serverTimezone=JST";
	private final String DB_USER="root";
	private final String DB_PASS="root";
	
	public List<Item> findCart(CartItem Jbk) {
		List<Item> cartList = new ArrayList<>();
		System.out.println("cartList_new ArrayList<>()");
		
		try {
			
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e1) {
			// TODO: handle exception
			e1.printStackTrace();
		}
//データベースへ接続
		try (Connection conn = DriverManager.getConnection(JDBC_URL, DB_USER, DB_PASS)) {
			System.out.println("CartDAOスタート");
			//ItemCategoryServleのkeyを持ってきたい
			for (String cart_item : Jbk.getCartMap().keySet()) {
				int cart_item_quant =  Jbk.getCartMap().get(cart_item);
			
			
			String sql = null;
			sql = "SELECT * FROM `item` WHERE `ITEM_ID` = " + cart_item+";";
			PreparedStatement pSmt = conn.prepareStatement(sql);
			//SELECTを実行して結果表を取得
			ResultSet rs = pSmt.executeQuery();
			
			//結果表に格納されたレコードの内容をインスタンスに設定し、ArrayListインスタンスに追加
			while (rs.next()) {
				
				System.out.println("while (rs.next())内");
				String name = rs.getString("NAME");
				int price= rs.getInt("PRICE");
				int cart_quant = cart_item_quant;
				int stock_quantity = rs.getInt("QUANTITY");
				String image_path = rs.getString("IMAGE_PATH");
				int item_id = rs.getInt("ITEM_ID");
				System.out.println(image_path);
				
		
				Item item = new Item( name,image_path,price, stock_quantity,cart_quant,item_id);
				　System.out.println(item);
				cartList.add(item);
				
				System.out.println("cartList"+cartList);
				System.out.println("Javabeans"+Jbk.getCart2Item());
			}
			}
		
		}catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
		System.out.println(Jbk.getCart2Item());
		return cartList;
	}

}

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新規作成ファイル
cartCheck.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="model.CartItem,model.Item,java.util.List" %>
<%
//
List<Item> cartList = (List<Item>) session.getAttribute("cartList");

%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="css/t_style.css">
<title>HAYNTH</title>
</head>
<body>
<jsp:include page="../header/header.jsp" />
<h1>Cart</h1>
<% int littletotal = 0; %>
<% int alltotal = 0; %>
<% for(Item c : cartList) {%>

<% littletotal = c.getPrice()*c.getCart_quantity(); %>
<% alltotal += littletotal; %>
<div class="cart_item_wrap">
	<div class="cart_item_img_wrap">
		<div class="cart_item_img">
		<img src="/HAYNTH/upload/<%= c.getImage_path() %>" alt="Koushin" class="koushin">
		</div>
			<div class="cart_item_price_wrap">
				<div class="cart_item_price">
				<p><%= c.getName() %>:<%= c.getPrice() %>円</p>
				</div>
				<div class="cart_item_quant">
				<p><input type="number" name="quantity" min="1" max="<%= c.getQuantity() %>" value="<%= c.getCart_quantity() %>"class=""></p>
				</div>
				<div class="cart_item_littletotal">
				
				<p>littletotal：¥<%= littletotal %></p>
				</div>
				<div class="cart_item_delete">
					<form action="" method="post" class="">
				              <button type="submit" value="修正"  name="削除"></button>
				    </form>
				</div>
			</div>
		</div>
		<div class="item_alltotal">
	
		</div>
		<div class="itemconfirm">
			<form action="/HAYNTH/ItemRegistServlet" method="post" class="">
				
		     <input type="submit" value="登録">
		  </form>
		</div>
			
</div>
<% } %>
<p><%= alltotal %>円</p>
<div class="footerarea">
</div>
</body>
</html>