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。
<%@ 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>
<%@ 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: ${totalPrice}</p>
<a href="checkout">去结算</a>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>结算</title>
</head>
<body>
<h1>结算页面</h1>
<form action="placeOrder" method="post">
<input type="hidden" name="totalPrice" value="${totalPrice}">
<p>总价: ${totalPrice}</p>
<button type="submit">提交订单</button>
</form>
</body>
</html>
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);
}
}
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
}
优势:
应用场景:
问题1:页面加载缓慢
问题2:安全性问题
问题3:并发处理能力不足
通过以上示例和解决方案,可以初步构建一个简单的JSP网上购物系统,并了解其基础概念和相关技术要点。
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