Update

src/assignment1/PasswordChange.java

@@ -13,7 +13,7 @@ public class PasswordChange {
     static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
 
     public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         Connection conn = null;
         PreparedStatement pstmt = null;
         ResultSet rs = null;
@@ -21,7 +21,7 @@ public class PasswordChange {
             Class.forName("com.mysql.cj.jdbc.Driver");
             conn = DriverManager.getConnection(DBURL);
             System.out.print("请输入用户名：");
-            String username = scanner.nextLine();
+            String username = sc.nextLine();
             String checkUserSql = "SELECT xingming FROM t_yong WHERE yonghuming=?";
             pstmt = conn.prepareStatement(checkUserSql);
             pstmt.setString(1, username);
@@ -31,7 +31,7 @@ public class PasswordChange {
                 return;
             }
             System.out.print("请输入当前用户的原密码：");
-            String oldPassword = scanner.nextLine();
+            String oldPassword = sc.nextLine();
             String checkPasswordSql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=MD5(?)";
             pstmt = conn.prepareStatement(checkPasswordSql);
             pstmt.setString(1, username);
@@ -44,14 +44,14 @@ public class PasswordChange {
             String newPassword;
             while (true) {
                 System.out.print("请设置新的密码：");
-                newPassword = scanner.nextLine();
+                newPassword = sc.nextLine();
                 if (!isPasswordComplex(newPassword))
                     System.out.println("您的密码不符合复杂性要求（密码长度不少于6个字符，至少有一个小写字母，至少有一个大写字母，至少一个数字），请重新输入：");
                 else
                     break;
             }
             System.out.print("请输入确认密码：");
-            String confirmPassword = scanner.nextLine();
+            String confirmPassword = sc.nextLine();
             if (!newPassword.equals(confirmPassword)) {
                 System.out.println("两次输入的密码必须一致，请重新输入确认密码：");
                 return;

src/assignment1/ProductAdditionAndInquiry.java

@@ -12,7 +12,7 @@ public class ProductAdditionAndInquiry {
     private static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
 
     public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         int choice;
         try (Connection conn = DriverManager.getConnection(DBURL)) {
             do {
@@ -21,14 +21,14 @@ public class ProductAdditionAndInquiry {
                 System.out.println("2、查询商品");
                 System.out.println("3、退出");
                 System.out.print("请选择（1-3）：");
-                choice = scanner.nextInt();
+                choice = sc.nextInt();
-                scanner.nextLine();
+                sc.nextLine();
                 switch (choice) {
                     case 1:
-                        addProduct(scanner, conn);
+                        addProduct(sc, conn);
                         break;
                     case 2:
-                        queryProduct(scanner, conn);
+                        queryProduct(sc, conn);
                         break;
                     case 3:
                         System.out.println("退出系统");
@@ -42,9 +42,9 @@ public class ProductAdditionAndInquiry {
         }
     }
 
-    private static void addProduct(Scanner scanner, Connection conn) throws SQLException {
+    private static void addProduct(Scanner sc, Connection conn) throws SQLException {
         System.out.print("请输入商品信息（格式：条形码，商品名称，单价，供应商）：");
-        String input = scanner.nextLine();
+        String input = sc.nextLine();
         String[] productInfo = input.split("，");
         String tiaoma = productInfo[0];
         PreparedStatement checkStmt = conn.prepareStatement("SELECT COUNT(*) FROM t_shangping WHERE tiaoma = ?");
@@ -65,9 +65,9 @@ public class ProductAdditionAndInquiry {
         System.out.println("增加成功");
     }
 
-    private static void queryProduct(Scanner scanner, Connection conn) throws SQLException {
+    private static void queryProduct(Scanner sc, Connection conn) throws SQLException {
         System.out.print("请输入查询的商品名称：");
-        String nameQuery = scanner.nextLine();
+        String nameQuery = sc.nextLine();
         PreparedStatement queryStmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE mingcheng LIKE ?");
         queryStmt.setString(1, "%" + nameQuery + "%");
         ResultSet rs = queryStmt.executeQuery();

src/assignment1/UserLogin.java

@@ -13,7 +13,7 @@ public class UserLogin {
     static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
 
     public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         Connection conn = null;
         PreparedStatement pstmt = null;
         ResultSet rs = null;
@@ -25,9 +25,9 @@ public class UserLogin {
             while (attempts < 3 && !loginSuccess) {
                 System.out.println("欢迎使用阳光超市收银系统，请登陆");
                 System.out.print("请输入用户名: ");
-                String username = scanner.nextLine();
+                String username = sc.nextLine();
                 System.out.print("请输入密码: ");
-                String password = scanner.nextLine();
+                String password = sc.nextLine();
                 String sql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=?";
                 pstmt = conn.prepareStatement(sql);
                 pstmt.setString(1, username);

src/excel/Test.java

@@ -16,7 +16,7 @@ import jxl.write.WritableWorkbook;
 
 public class Test {
     public static void main(String[] args) throws Exception {
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         WritableWorkbook book = Workbook.createWorkbook(new File("src/excel/求职简历.xls"));
         WritableFont font = new WritableFont(WritableFont.createFont("SimSun"), 11);
         WritableCellFormat borderFormat = new WritableCellFormat(font);
@@ -52,29 +52,29 @@ public class Test {
         sheet.addCell(new Label(0, 18, "专长", borderFormat));
         sheet.setRowView(0, 520);
         System.out.println("姓名：");
-        sheet.addCell(new Label(1, 1, scanner.next(), borderFormat));
+        sheet.addCell(new Label(1, 1, sc.next(), borderFormat));
         System.out.println("性别：");
-        sheet.addCell(new Label(3, 1, scanner.next(), borderFormat));
+        sheet.addCell(new Label(3, 1, sc.next(), borderFormat));
         System.out.println("籍贯：");
-        sheet.addCell(new Label(5, 1, scanner.next(), borderFormat));
+        sheet.addCell(new Label(5, 1, sc.next(), borderFormat));
         System.out.println("出生日期：");
-        sheet.addCell(new Label(1, 2, scanner.next(), borderFormat));
+        sheet.addCell(new Label(1, 2, sc.next(), borderFormat));
         System.out.println("民族：");
-        sheet.addCell(new Label(3, 2, scanner.next(), borderFormat));
+        sheet.addCell(new Label(3, 2, sc.next(), borderFormat));
         System.out.println("邮箱：");
-        sheet.addCell(new Label(5, 2, scanner.next(), borderFormat));
+        sheet.addCell(new Label(5, 2, sc.next(), borderFormat));
         System.out.println("家庭地址：");
-        sheet.addCell(new Label(1, 3, scanner.next(), borderFormat));
+        sheet.addCell(new Label(1, 3, sc.next(), borderFormat));
         System.out.println("政治面貌：");
-        sheet.addCell(new Label(1, 4, scanner.next(), borderFormat));
+        sheet.addCell(new Label(1, 4, sc.next(), borderFormat));
         System.out.println("电话：");
-        sheet.addCell(new Label(3, 4, scanner.next(), borderFormat));
+        sheet.addCell(new Label(3, 4, sc.next(), borderFormat));
         System.out.println("专业：");
-        sheet.addCell(new Label(5, 4, scanner.next(), borderFormat));
+        sheet.addCell(new Label(5, 4, sc.next(), borderFormat));
         System.out.println("个人简介：");
-        sheet.addCell(new Label(0, 8, scanner.next(), borderFormat));
+        sheet.addCell(new Label(0, 8, sc.next(), borderFormat));
         System.out.println("特长：");
-        sheet.addCell(new Label(0, 19, scanner.next(), borderFormat));
+        sheet.addCell(new Label(0, 19, sc.next(), borderFormat));
         for (int i = 0; i <= 5; i++)
             for (int j = 5; j <= 6; j++)
                 sheet.addCell(new Label(i, j, " ", borderFormat));

src/finalexam/Database/Cashier.java

@@ -17,23 +17,23 @@ public class Cashier {
         Connection conn = DriverManager.getConnection(DBURL);
         PreparedStatement pstmt = null;
         ResultSet rs = null;
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         boolean continueCashier = true;
         int sequence = 0;
         String lastDate = "";
         while (continueCashier) {
             System.out.println("欢迎使用阳光超市收银系统");
             System.out.print("请输入商品条形码（6位数字字符）：");
-            String barcode = scanner.nextLine();
+            String barcode = sc.nextLine();
             pstmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE tiaoma = ?");
             pstmt.setString(1, barcode);
             rs = pstmt.executeQuery();
             if (rs.next()) {
                 System.out.print("输入商品数量：");
-                int quantity = scanner.nextInt();
+                int quantity = sc.nextInt();
-                scanner.nextLine();
+                sc.nextLine();
                 System.out.print("请输入收银员：");
-                String cashier = scanner.nextLine();
+                String cashier = sc.nextLine();
                 String productName = rs.getString("mingcheng");
                 double price = rs.getDouble("danjia");
                 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
@@ -59,7 +59,7 @@ public class Cashier {
             } else
                 System.out.println("您输入的商品条形码不存在，请确认后重新输入");
             System.out.print("是否继续收银（y/n）：");
-            String choice = scanner.nextLine();
+            String choice = sc.nextLine();
             if ("n".equalsIgnoreCase(choice))
                 continueCashier = false;
         }

src/finalexam/Database/CashierStatistics.java

@@ -19,14 +19,14 @@ public class CashierStatistics {
         Connection conn = DriverManager.getConnection(DBURL);
         PreparedStatement pstmt = null;
         ResultSet rs = null;
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         String inputDate;
         Date saleDate = null;
         boolean validDate = false;
         while (!validDate) {
             System.out.print("请输入销售日期（yyyy-mm-dd）:");
-            inputDate = scanner.nextLine();
+            inputDate = sc.nextLine();
             try {
                 saleDate = sdf.parse(inputDate);
                 validDate = true;
@@ -61,7 +61,7 @@ public class CashierStatistics {
         String continueInput;
         do {
             System.out.print("是否继续查询（y/n）:");
-            continueInput = scanner.nextLine();
+            continueInput = sc.nextLine();
             if ("n".equalsIgnoreCase(continueInput)) {
                 System.out.println("程序成功退出");
                 break;

src/finalexam/Database/DataInput.java

@@ -22,13 +22,13 @@ public class DataInput {
         Connection conn = DriverManager.getConnection(DBURL);
         PreparedStatement pstmt = null;
         ResultSet rs = null;
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         System.out.println("====超市商品管理维护====");
         System.out.println("1、从excel中导入数据");
         System.out.println("2、从文本文件导入数据");
         System.out.println("3、返回主菜单");
         System.out.print("请选择（1-3）：");
-        int choice = scanner.nextInt();
+        int choice = sc.nextInt();
         int cnt = 0;
         switch (choice) {
             case 1:

src/finalexam/Database/PasswordChange.java

@@ -17,9 +17,9 @@ public class PasswordChange {
         Connection conn = DriverManager.getConnection(DBURL);
         PreparedStatement pstmt = null;
         ResultSet rs = null;
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         System.out.print("请输入用户名：");
-        String username = scanner.nextLine();
+        String username = sc.nextLine();
         String checkUserSql = "SELECT xingming FROM t_yong WHERE yonghuming=?";
         pstmt = conn.prepareStatement(checkUserSql);
         pstmt.setString(1, username);
@@ -29,7 +29,7 @@ public class PasswordChange {
             return;
         }
         System.out.print("请输入当前用户的原密码：");
-        String oldPassword = scanner.nextLine();
+        String oldPassword = sc.nextLine();
         String checkPasswordSql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=MD5(?)";
         pstmt = conn.prepareStatement(checkPasswordSql);
         pstmt.setString(1, username);
@@ -42,14 +42,14 @@ public class PasswordChange {
         String newPassword;
         while (true) {
             System.out.print("请设置新的密码：");
-            newPassword = scanner.nextLine();
+            newPassword = sc.nextLine();
             if (!isPasswordComplex(newPassword))
                 System.out.println("您的密码不符合复杂性要求（密码长度不少于6个字符，至少有一个小写字母，至少有一个大写字母，至少一个数字），请重新输入：");
             else
                 break;
         }
         System.out.print("请输入确认密码：");
-        String confirmPassword = scanner.nextLine();
+        String confirmPassword = sc.nextLine();
         if (!newPassword.equals(confirmPassword)) {
             System.out.println("两次输入的密码必须一致，请重新输入确认密码：");
             return;

src/finalexam/Database/ProductAdditionAndInquiry.java

@@ -15,7 +15,7 @@ public class ProductAdditionAndInquiry {
     public static void main(String[] args) throws Exception {
         Class.forName(DBDRIVER);
         Connection conn = DriverManager.getConnection(DBURL);
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         int choice;
         do {
             System.out.println("===超市商品管理维护====");
@@ -23,14 +23,14 @@ public class ProductAdditionAndInquiry {
             System.out.println("2、查询商品");
             System.out.println("3、退出");
             System.out.print("请选择（1-3）：");
-            choice = scanner.nextInt();
+            choice = sc.nextInt();
-            scanner.nextLine();
+            sc.nextLine();
             switch (choice) {
                 case 1:
-                    addProduct(scanner, conn);
+                    addProduct(sc, conn);
                     break;
                 case 2:
-                    queryProduct(scanner, conn);
+                    queryProduct(sc, conn);
                     break;
                 case 3:
                     System.out.println("退出系统");
@@ -42,9 +42,9 @@ public class ProductAdditionAndInquiry {
         conn.close();
     }
 
-    private static void addProduct(Scanner scanner, Connection conn) throws SQLException {
+    private static void addProduct(Scanner sc, Connection conn) throws SQLException {
         System.out.print("请输入商品信息（格式：条形码，商品名称，单价，供应商）：");
-        String input = scanner.nextLine();
+        String input = sc.nextLine();
         String[] productInfo = input.split("，");
         String tiaoma = productInfo[0];
         PreparedStatement checkStmt = conn.prepareStatement("SELECT COUNT(*) FROM t_shangping WHERE tiaoma = ?");
@@ -65,9 +65,9 @@ public class ProductAdditionAndInquiry {
         System.out.println("增加成功");
     }
 
-    private static void queryProduct(Scanner scanner, Connection conn) throws SQLException {
+    private static void queryProduct(Scanner sc, Connection conn) throws SQLException {
         System.out.print("请输入查询的商品名称：");
-        String nameQuery = scanner.nextLine();
+        String nameQuery = sc.nextLine();
         PreparedStatement queryStmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE mingcheng LIKE ?");
         queryStmt.setString(1, "%" + nameQuery + "%");
         ResultSet rs = queryStmt.executeQuery();

src/finalexam/Database/UserLogin.java

@@ -17,15 +17,15 @@ public class UserLogin {
         Connection conn = DriverManager.getConnection(DBURL);
         PreparedStatement pstmt = null;
         ResultSet rs = null;
-        Scanner scanner = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
         int attempts = 0;
         boolean loginSuccess = false;
         while (attempts < 3 && !loginSuccess) {
             System.out.println("欢迎使用阳光超市收银系统，请登陆");
             System.out.print("请输入用户名: ");
-            String username = scanner.nextLine();
+            String username = sc.nextLine();
             System.out.print("请输入密码: ");
-            String password = scanner.nextLine();
+            String password = sc.nextLine();
             String sql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=?";
             pstmt = conn.prepareStatement(sql);
             pstmt.setString(1, username);