jsp实现网上购物系统代码

JSP（JavaServer Pages）是一种基于Java技术的服务器端编程技术，用于创建动态网页。下面是一个简单的JSP网上购物系统的代码示例，包括商品展示、购物车和订单处理的基本功能。

1. 商品展示页面 (products.jsp)

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>商品展示</title>
</head>
<body>
    <h1>商品列表</h1>
    <table border="1">
        <tr>
            <th>商品名称</th>
            <th>价格</th>
            <th>操作</th>
        </tr>
        <c:forEach items="${products}" var="product">
            <tr>
                <td>${product.name}</td>
                <td>${product.price}</td>
                <td><a href="addToCart?id=${product.id}">加入购物车</a></td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

2. 购物车页面 (cart.jsp)

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>购物车</title>
</head>
<body>
    <h1>购物车</h1>
    <table border="1">
        <tr>
            <th>商品名称</th>
            <th>价格</th>
            <th>数量</th>
            <th>小计</th>
            <th>操作</th>
        </tr>
        <c:forEach items="${cart}" var="item">
            <tr>
                <td>${item.product.name}</td>
                <td>${item.product.price}</td>
                <td>${item.quantity}</td>
                <td>${item.product.price * item.quantity}</td>
                <td><a href="removeFromCart?id=${item.product.id}">移除</a></td>
            </tr>
        </c:forEach>
    </table>
    <p>总价: ${totalPrice}</p>
    <a href="checkout">去结算</a>
</body>
</html>

3. 订单处理页面 (checkout.jsp)

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>结算</title>
</head>
<body>
    <h1>结算页面</h1>
    <form action="placeOrder" method="post">
        <input type="hidden" name="totalPrice" value="${totalPrice}">
        <p>总价: ${totalPrice}</p>
        <button type="submit">提交订单</button>
    </form>
</body>
</html>

4. Servlet 示例 (ProductServlet.java)

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet("/products")
public class ProductServlet extends HttpServlet {
    private List<Product> products = new ArrayList<>();

    @Override
    public void init() throws ServletException {
        // 初始化商品数据
        products.add(new Product(1, "商品A", 100));
        products.add(new Product(2, "商品B", 200));
        products.add(new Product(3, "商品C", 300));
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setAttribute("products", products);
        request.getRequestDispatcher("/products.jsp").forward(request, response);
    }
}

5. 商品类 (Product.java)

public class Product {
    private int id;
    private String name;
    private double price;

    public Product(int id, String name, double price) {
        this.id = id;
        this.name = name;
        this.price = price;
    }

    // Getters and Setters
}