java web实现购物车功能jsp+servlet完整代码
时间: 2023-11-11 16:03:27 浏览: 226
jsp+servlet 购物车完整
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当然,下面是一个简单的Java Web实现购物车功能的jsp+servlet的完整代码示例:
首先,创建一个名为"CartServlet.java"的Servlet类,用于处理购物车相关的操作:
```java
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/cart")
public class CartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String action = request.getParameter("action");
if (action != null && action.equals("add")) {
String item = request.getParameter("item");
if (item != null && !item.isEmpty()) {
List<String> cart = (List<String>) request.getSession().getAttribute("cart");
if (cart == null) {
cart = new ArrayList<>();
request.getSession().setAttribute("cart", cart);
}
cart.add(item);
}
response.sendRedirect(request.getContextPath() + "/cart");
} else {
request.getRequestDispatcher("/WEB-INF/views/cart.jsp").forward(request, response);
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
```
然后,创建一个名为"cart.jsp"的JSP页面,用于展示购物车内容和添加商品到购物车:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Shopping Cart</title>
</head>
<body>
<h1>Shopping Cart</h1>
<form action="${pageContext.request.contextPath}/cart?action=add" method="post">
<label for="item">Item:</label>
<input type="text" id="item" name="item" required>
<button type="submit">Add to Cart</button>
</form>
<h2>Cart Contents:</h2>
<ul>
<c:forEach items="${cart}" var="item">
<li>${item}</li>
</c:forEach>
</ul>
</body>
</html>
```
最后,将以上代码保存到合适的目录下,并在你的Java Web项目中配置好Servlet和JSP的映射关系。
注意:上述代码使用了JSTL标签库(c标签),所以需要在项目中引入相应的JSTL库。
这个示例实现了一个简单的购物车功能,可以通过表单输入商品名称,然后将其添加到购物车中,并在页面上展示购物车的内容。当然,实际的购物车功能可能会更加复杂,需要更多的业务逻辑和数据处理。希望这个示例能帮到你!
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