给出能实现文档内容功能的完整代码

实现文档中描述的功能需要多个JSP页面和Java Servlet来处理请求。以下是一个简化的示例代码，展示了如何实现这些功能。请注意，这只是一个基本的示例，实际应用中可能需要更多的安全性和错误处理措施。 ### 数据库配置首先，确保你有一个MySQL数据库，并创建一个名为`mydb`的数据库，然后创建两个表：`users`和`products`。 ```sql CREATE DATABASE mydb; USE mydb; CREATE TABLE users ( id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL UNIQUE, password VARCHAR(50) NOT NULL, role ENUM('admin', 'user') DEFAULT 'user' ); CREATE TABLE products ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(100) NOT NULL, price DECIMAL(10, 2) NOT NULL, description TEXT ); ``` ### 注册页面 (register.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Register</title> </head> <body> <h2>Register</h2> <form action="RegisterServlet" method="post"> Username: <input type="text" name="username" required><br> Password: <input type="password" name="password" required><br> <input type="submit" value="Register"> </form> </body> </html> ``` ### 注册Servlet (RegisterServlet.java) ```java import java.io.IOException; 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.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; @WebServlet("/RegisterServlet") public class RegisterServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); String password = request.getParameter("password"); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); PreparedStatement pstmt = conn.prepareStatement("INSERT INTO users (username, password) VALUES (?, ?)"); pstmt.setString(1, username); pstmt.setString(2, password); pstmt.executeUpdate(); response.sendRedirect("login1.jsp"); } catch (Exception e) { e.printStackTrace(); } } } ``` ### 登录页面 (login1.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Login</title> </head> <body> <h2>Login</h2> <form action="LoginServlet" method="post"> Username: <input type="text" name="username" required><br> Password: <input type="password" name="password" required><br> <input type="submit" value="Login"> </form> </body> </html> ``` ### 登录Servlet (LoginServlet.java) ```java import java.io.IOException; 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.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; @WebServlet("/LoginServlet") public class LoginServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); String password = request.getParameter("password"); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); PreparedStatement pstmt = conn.prepareStatement("SELECT * FROM users WHERE username = ? AND password = ?"); pstmt.setString(1, username); pstmt.setString(2, password); ResultSet rs = pstmt.executeQuery(); if (rs.next()) { String role = rs.getString("role"); if ("admin".equals(role)) { response.sendRedirect("shopadmin.jsp"); } else { response.sendRedirect("shoplist.jsp"); } } else { response.sendRedirect("login1.jsp?error=Invalid credentials"); } } catch (Exception e) { e.printStackTrace(); } } } ``` ### 商品管理页面 (shopadmin.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.sql.*" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Shop Admin</title> </head> <body> <h2>Add Product</h2> <form action="AddProductServlet" method="post"> Name: <input type="text" name="name" required><br> Price: <input type="number" step="0.01" name="price" required><br> Description: <textarea name="description"></textarea><br> <input type="submit" value="Add Product"> </form> <h2>Products List</h2> <table border="1"> <tr> <th>ID</th> <th>Name</th> <th>Price</th> <th>Description</th> </tr> <% try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery("SELECT * FROM products"); while (rs.next()) { %> <tr> <td><%= rs.getInt("id") %></td> <td><%= rs.getString("name") %></td> <td><%= rs.getBigDecimal("price") %></td> <td><%= rs.getString("description") %></td> </tr> <% } rs.close(); stmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } %> </table> </body> </html> ``` ### 添加商品Servlet (AddProductServlet.java) ```java import java.io.IOException; 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.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; @WebServlet("/AddProductServlet") public class AddProductServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name"); double price = Double.parseDouble(request.getParameter("price")); String description = request.getParameter("description"); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); PreparedStatement pstmt = conn.prepareStatement("INSERT INTO products (name, price, description) VALUES (?, ?, ?)"); pstmt.setString(1, name); pstmt.setDouble(2, price); pstmt.setString(3, description); pstmt.executeUpdate(); response.sendRedirect("shopadmin.jsp"); } catch (Exception e) { e.printStackTrace(); } } } ``` ### 商品列表页面 (shoplist.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.sql.*" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Shop List</title> </head> <body> <h2>Products List</h2> <table border="1"> <tr> <th>Name</th> <th>Price</th> <th>Description</th> <th>Action</th> </tr> <% try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery("SELECT * FROM products"); while (rs.next()) { %> <tr> <td><%= rs.getString("name") %></td> <td><%= rs.getBigDecimal("price") %></td> <td><%= rs.getString("description") %></td> <td><a href="shopdetail.jsp?id=<%= rs.getInt("id") %>">View Details</a></td> </tr> <% } rs.close(); stmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } %> </table> </body> </html> ``` ### 商品详情页面 (shopdetail.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.sql.*" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Product Detail</title> </head> <body> <% int id = Integer.parseInt(request.getParameter("id")); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); PreparedStatement pstmt = conn.prepareStatement("SELECT * FROM products WHERE id = ?"); pstmt.setInt(1, id); ResultSet rs = pstmt.executeQuery(); if (rs.next()) { %> <h2><%= rs.getString("name") %></h2> <p>Price: <%= rs.getBigDecimal("price") %></p> <p>Description: <%= rs.getString("description") %></p> <form action="AddToCartServlet" method="post"> Quantity: <input type="number" name="quantity" min="1" value="1"><br> <input type="hidden" name="productId" value="<%= id %>"> <input type="submit" value="Add to Cart"> </form> <% } rs.close(); pstmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } %> </body> </html> ``` ### 添加到购物车Servlet (AddToCartServlet.java) ```java import java.io.IOException; 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 javax.servlet.http.HttpSession; @WebServlet("/AddToCartServlet") public class AddToCartServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(); String username = (String) session.getAttribute("username"); if (username == null) { response.sendRedirect("login1.jsp"); return; } int productId = Integer.parseInt(request.getParameter("productId")); int quantity = Integer.parseInt(request.getParameter("quantity")); // Store the cart items in session CartItem item = new CartItem(productId, quantity); Cart cart = (Cart) session.getAttribute("cart"); if (cart == null) { cart = new Cart(); session.setAttribute("cart", cart); } cart.addItem(item); response.sendRedirect("shopcart.jsp"); } } class CartItem { private int productId; private int quantity; public CartItem(int productId, int quantity) { this.productId = productId; this.quantity = quantity; } public int getProductId() { return productId; } public int getQuantity() { return quantity; } } class Cart { private List<CartItem> items = new ArrayList<>(); public void addItem(CartItem item) { items.add(item); } public List<CartItem> getItems() { return items; } } ``` ### 购物车页面 (shopcart.jsp) ```jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.util.List" %> <%@ page import="javax.servlet.http.HttpSession" %> <%@ page import="java.sql.*" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Shopping Cart</title> </head> <body> <h2>Shopping Cart</h2> <% HttpSession session = request.getSession(); String username = (String) session.getAttribute("username"); if (username == null) { response.sendRedirect("login1.jsp"); return; } Cart cart = (Cart) session.getAttribute("cart"); if (cart != null && !cart.getItems().isEmpty()) { %> <table border="1"> <tr> <th>Name</th> <th>Price</th> <th>Quantity</th> <th>Total</th> <th>Action</th> </tr> <% double total = 0; for (CartItem item : cart.getItems()) { int productId = item.getProductId(); int quantity = item.getQuantity(); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "your_password"); PreparedStatement pstmt =

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给出能实现文档内容功能的完整代码

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