How to implement the Java switch grocery shopping system with purchase history function

How to realize the purchase history function of the Java switch grocery shopping system

With the development of e-commerce, more and more people are beginning to use online shopping platforms to purchase life required. One of the common purchasing needs is grocery shopping. In order to meet the needs of users, we can develop a Java switch grocery shopping system, which includes a purchase history function. This article will detail how to implement this functionality.

1. System requirements analysis
Before starting development, we first need to conduct system requirements analysis. According to the needs of users, we can define the following functions of the system:
(1) User login registration function: Users can log in to the system through their mobile phone number or account password, and can register a new account.
(2) Product browsing function: Users can browse the dishes on the platform and select the products they need to purchase.
(3) Shopping cart function: Users can add the products they need to purchase to the shopping cart to facilitate unified management.
(4) Order function: Users can select the items they want to purchase in the shopping cart, generate an order and complete payment.
(5) Purchase history function: The system will save the user’s purchase history, including order information, payment amount, purchase time, etc.

2. Database design
In order to save the user's purchase history, we need to design the corresponding database table. The following is an example of a purchase history table:

Purchase History Table (purchase_history)
Fields:

• Order ID (order_id): A unique identifier used to associate orders Table
• User ID (user_id): unique identifier, used to associate user table
• Purchase time (purchase_time): record purchase time
• Payment amount (payment_amount): record Payment amount

3. Back-end development
In back-end development, we need to implement the purchase history function according to needs. The following is a Java code example:

(1) Define the purchase history class:

public class PurchaseHistory {
    private int orderId;
    private int userId;
    private Date purchaseTime;
    private double paymentAmount;

    // getter和setter方法省略
}

(2) After the order is generated, save the purchase history:

public class OrderService {
    public void generateOrder(Order order) {
        // 订单生成代码省略

        // 保存购买历史记录
        PurchaseHistory history = new PurchaseHistory();
        history.setOrderId(order.getOrderId());
        history.setUserId(order.getUserId());
        history.setPurchaseTime(new Date());
        history.setPaymentAmount(order.getTotalAmount());
        purchaseHistoryDao.save(history);
    }
}

(3 ) Query purchase history:

public class PurchaseHistoryService {
    public List<PurchaseHistory> getPurchaseHistory(int userId) {
        return purchaseHistoryDao.findByUserId(userId);
    }
}

4. Front-end development
In front-end development, we need to display the user's purchase history according to needs. The following is a sample code for the front-end page:

(1) Purchase history page (purchase_history.jsp):

<table>
    <tr>
        <th>订单ID</th>
        <th>购买时间</th>
        <th>支付金额</th>
    </tr>
    <c:forEach var="history" items="${purchaseHistoryList}">
        <tr>
            <td>${history.orderId}</td>
            <td>${history.purchaseTime}</td>
            <td>${history.paymentAmount}</td>
        </tr>
    </c:forEach>
</table>

(2) Display the purchase history link on the personal center page (user_dashboard.jsp ):

<a href="purchase_history.jsp">查看购买历史记录</a>

5. Summary
Through the above steps, we successfully implemented a Java switch grocery shopping system with purchase history recording function. Users can use the system through the login registration function, browse the dishes and add them to the shopping cart, and finally place the order and complete the payment. The system will save the user's purchase history, which the user can view on the personal center page. This system not only meets the needs of users to purchase dishes, but also provides a convenient purchase history recording function to help users manage and review purchase history. This system can be applied to various online purchasing areas such as groceries and fresh food, providing users with a convenient shopping experience.

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