20241215 完善购物车功能，小bug修复

1. 完善购物车功能，现在点击结算后会清除购物车
2. 其他bug修复

src/main/java/action/AllOrderServlet.java

@@ -3,9 +3,11 @@
 import bean.Olist;
 import dao.OlistDAO;
 
-import javax.servlet.*;
-import javax.servlet.http.*;
-import javax.servlet.annotation.*;
+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.sql.SQLException;
 import java.util.List;

src/main/java/action/SettlementServlet.java

@@ -4,14 +4,17 @@
 import bean.Product;
 import bean.User;
 import dao.CartItemDAO;
-import dao.ProductDAO;
 import dao.OrderDAO;
+import dao.ProductDAO;
 import utils.JsonUtil;
 import utils.UUIDUtils;
 
-import javax.servlet.*;
-import javax.servlet.http.*;
-import javax.servlet.annotation.*;
+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;
 import java.io.IOException;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;

src/main/java/bean/Olist.java

@@ -10,6 +10,13 @@ public Olist() {
         super();
     }
 
+    public Olist(String listid, String uid, String time, String item) {
+        this.listid = listid;
+        this.uid = uid;
+        this.time = time;
+        this.item = item;
+    }
+
     @Override
     public String toString() {
         return "Olist{" +
@@ -51,11 +58,4 @@ public String getItem() {
     public void setItem(String item) {
         this.item = item;
     }
-
-    public Olist(String listid, String uid, String time, String item) {
-        this.listid = listid;
-        this.uid = uid;
-        this.time = time;
-        this.item = item;
-    }
 }

src/main/java/dao/CartItemDAO.java

@@ -124,14 +124,33 @@ public List<CartItem> findCartItemsByUid(String uid) throws SQLException {
 
     public void clearCartByUid(String uid) {
         // 清空购物车（清空给定uid的cart和cartitem）
-        String sql = "DELETE FROM cart WHERE uid = ?";
+        String sqlGetOids = "SELECT oid FROM cart WHERE uid = ?";
+        String sqlDeleteCart = "DELETE FROM cart WHERE uid = ?";
+        String sqlDeleteCartItems = "DELETE FROM cartitem WHERE oid = ?";
+
         try (Connection conn = DBUtil.getConnection();
-             PreparedStatement pstmt = conn.prepareStatement(sql)) {
-            pstmt.setString(1, uid);
-            System.out.println(pstmt.toString()); // 打印SQL语句
-            pstmt.executeUpdate();
+             PreparedStatement pstmtGetOids = conn.prepareStatement(sqlGetOids);
+             PreparedStatement pstmtDeleteCart = conn.prepareStatement(sqlDeleteCart);
+             PreparedStatement pstmtDeleteCartItems = conn.prepareStatement(sqlDeleteCartItems)) {
+
+            // 获取所有与uid对应的oid
+            pstmtGetOids.setString(1, uid);
+            ResultSet rs = pstmtGetOids.executeQuery();
+
+            // 删除cartitem表中对应的oid项
+            while (rs.next()) {
+                String oid = rs.getString("oid");
+                pstmtDeleteCartItems.setString(1, oid);
+                pstmtDeleteCartItems.executeUpdate();
+            }
+
+            // 删除cart表中对应的uid项
+            pstmtDeleteCart.setString(1, uid);
+            pstmtDeleteCart.executeUpdate();
+
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
+
 }

src/main/java/dao/OrderDAO.java

@@ -1,6 +1,5 @@
 package dao;
 
-import bean.Order;
 import utils.DBUtil;
 
 import java.sql.Connection;
@@ -12,10 +11,10 @@ public class OrderDAO {
     /**
      * 保存订单信息到数据库
      *
-     * @param uid   用户ID
+     * @param uid    用户ID
      * @param listid 订单ID
-     * @param time  下单时间
-     * @param item  商品信息的JSON字符串
+     * @param time   下单时间
+     * @param item   商品信息的JSON字符串
      * @throws SQLException 如果发生SQL异常
      */
     public void saveOrder(String uid, String listid, String time, String item) throws SQLException {

src/main/webapp/allorders.jsp

@@ -15,25 +15,31 @@
             font-family: Arial, sans-serif;
             margin: 20px;
         }
+
         table {
             width: 100%;
             border-collapse: collapse;
         }
+
         th, td {
             border: 1px solid #ddd;
             padding: 8px;
             text-align: left;
         }
+
         th {
             background-color: #f2f2f2;
         }
+
         tr:hover {
             background-color: #f1f1f1;
         }
+
         a {
             text-decoration: none;
             color: blue;
         }
+
         a:hover {
             text-decoration: underline;
         }

src/main/webapp/cart.jsp

@@ -43,7 +43,7 @@
 </table>
 <h2>总价: <%= request.getAttribute("totalPrice") %> 元</h2>
 <div class="buttons-container">
-    <a href="ProductListServlet">继续购物</a>
+    <a href="SelectAllProductByPidAndCidServlet">继续购物</a>
     <a href="SettlementServlet">结算</a>
 </div>
 </body>

src/main/webapp/ofinish.jsp

@@ -15,9 +15,11 @@
             text-align: center;
             margin-top: 50px;
         }
+
         h1 {
             color: green;
         }
+
         p {
             font-size: 18px;
         }