基于javaweb的网上商城系统(java+jsp+servlert+mysql+ajax)
由于提供整个在线商城系统的代码超出了问答的字数限制,我将提供一个简化版本的在线商城系统的核心功能代码示例。这个示例将展示如何使用Java、JSP、Servlet和MySQL创建一个简单的在线商城,并使用Ajax实现前端的异步更新功能。
// 假设已经有了数据库连接和查询工具类,以下仅展示核心功能代码
// 展示商品列表的Servlet
@WebServlet("/listProducts")
public class ProductListServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Product> products = ProductDAO.getAllProducts(); // 假设有一个ProductDAO类来获取所有商品
request.setAttribute("products", products);
request.getRequestDispatcher("/WEB-INF/jsp/productList.jsp").forward(request, response);
}
}
// 展示商品详情的Servlet
@WebServlet("/productDetail")
public class ProductDetailServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String productId = request.getParameter("id");
Product product = ProductDAO.getProductById(productId); // 假设有一个ProductDAO类来根据ID获取商品详情
request.setAttribute("product", product);
request.getRequestDispatcher("/WEB-INF/jsp/productDetail.jsp").forward(request, response);
}
}
// 添加商品到购物车的Servlet
@WebServlet("/addToCart")
public class AddToCartServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String productId = request.getParameter("productId");
HttpSession session = request.getSession();
Cart cart = (Cart) session.getAttribute("cart");
if (cart == null) {
cart = new Cart();
session.setAttribute("cart", cart);
}
cart.addProduct(ProductDAO.getProductById(productId)); // 假设Cart类有一个addProduct方法
response.setContentType("application/json");
PrintWriter out = response.getWriter();
out.print("{\"status\":\"success\"}");
out.flush();
}
}
// 购物车页面的Servlet
@WebServlet("/viewCart")
public class ViewCartServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
Cart cart = (Cart) session.getAttribute("cart");
if (cart == null) {
cart = new Cart(); // 如果购物车为空,创建一个新的购物车对象
session.setAttribute("cart
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