diff --git a/.vscode/settings.json b/.vscode/settings.json index 2b395b0..be735fc 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -1,7 +1,6 @@ { + "java.project.explorer.showNonJavaResources": false, "java.project.referencedLibraries": [ - "lib/**/*.jar", - "excel/jxl.jar" - ], - "java.project.explorer.showNonJavaResources": false + "lib/**/*.jar" + ] } \ No newline at end of file diff --git a/assignment1/Encrypt.java b/assignment1/Encrypt.java new file mode 100644 index 0000000..5b86335 --- /dev/null +++ b/assignment1/Encrypt.java @@ -0,0 +1,30 @@ +package assignment1; + +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; + +//对字符串进行加密 +public class Encrypt { + public static String MD5(String str) { + try { + MessageDigest md = MessageDigest.getInstance("MD5"); + md.update(str.getBytes()); + byte[] b = md.digest(); + StringBuffer sb = new StringBuffer(); + for (byte c : b) { + int val = ((int) c) & 0xff; + if (val < 16) + sb.append("0"); + sb.append(Integer.toHexString(val)); + } + return sb.toString().toUpperCase(); + } catch (NoSuchAlgorithmException e) { + e.printStackTrace(); + } + return null; + } + + public static void main(String[] args) { + System.out.println(MD5("123456")); + } +} diff --git a/assignment1/PasswordChange.java b/assignment1/PasswordChange.java new file mode 100644 index 0000000..d89f9a8 --- /dev/null +++ b/assignment1/PasswordChange.java @@ -0,0 +1,91 @@ +package assignment1; + +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.Scanner; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +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); + Connection conn = null; + PreparedStatement pstmt = null; + ResultSet rs = null; + try { + 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 checkUserSql = "SELECT xingming FROM t_yong WHERE yonghuming=?"; + pstmt = conn.prepareStatement(checkUserSql); + pstmt.setString(1, username); + rs = pstmt.executeQuery(); + if (!rs.next()) { + System.out.println("该用户不存在，请重新输入"); + return; + } + System.out.print("请输入当前用户的原密码："); + String oldPassword = scanner.nextLine(); + String checkPasswordSql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=MD5(?)"; + pstmt = conn.prepareStatement(checkPasswordSql); + pstmt.setString(1, username); + pstmt.setString(2, oldPassword); + rs = pstmt.executeQuery(); + if (!rs.next()) { + System.out.println("原密码输入不正确，请重新输入"); + return; + } + String newPassword; + while (true) { + System.out.print("请设置新的密码："); + newPassword = scanner.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(); + 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; + } + String updatePasswordSql = "UPDATE t_yong SET mima=? WHERE yonghuming=?"; + pstmt = conn.prepareStatement(updatePasswordSql); + pstmt.setString(1, Encrypt.MD5(newPassword)); + pstmt.setString(2, username); + int result = pstmt.executeUpdate(); + if (result > 0) + System.out.println("您已成功修改密码，请谨记"); + else + System.out.println("密码修改失败，请重试"); + } catch (Exception e) { + e.printStackTrace(); + } finally { + try { + if (rs != null) + rs.close(); + if (pstmt != null) + pstmt.close(); + if (conn != null) + conn.close(); + } catch (SQLException se) { + se.printStackTrace(); + } + } + } + + public static boolean isPasswordComplex(String password) { + if (password.length() < 6) + return false; + Pattern pattern = Pattern.compile("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{6,}$"); + Matcher matcher = pattern.matcher(password); + return matcher.matches(); + } +} diff --git a/assignment1/SupermarketManagement.java b/assignment1/SupermarketManagement.java new file mode 100644 index 0000000..4b9aaa9 --- /dev/null +++ b/assignment1/SupermarketManagement.java @@ -0,0 +1,85 @@ +package assignment1; + +import java.math.BigDecimal; +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.Scanner; + +public class SupermarketManagement { + 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); + int choice; + try (Connection conn = DriverManager.getConnection(DBURL)) { + do { + System.out.println("===超市商品管理维护===="); + System.out.println("1、输入商品"); + 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(); + scanner.nextLine(); + switch (choice) { + case 1: + addProduct(scanner, conn); + break; + case 2: + queryProduct(scanner, conn); + break; + case 3: + System.out.println("退出系统"); + break; + default: + System.out.println("无效选择，请重新选择（1-3）："); + } + } while (choice != 3); + } catch (SQLException e) { + e.printStackTrace(); + } + } + + private static void addProduct(Scanner scanner, 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[] productInfo = input.split("，"); + String tiaoma = productInfo[0]; + PreparedStatement checkStmt = conn.prepareStatement("SELECT COUNT(*) FROM t_shangping WHERE tiaoma = ?"); + checkStmt.setString(1, tiaoma); + ResultSet rs = checkStmt.executeQuery(); + rs.next(); + if (rs.getInt(1) > 0) { + System.out.println("条形码不能重复，请重新输入"); + return; + } + PreparedStatement insertStmt = conn.prepareStatement( + "INSERT INTO t_shangping (tiaoma, mingcheng, danjia, gongyingshang) VALUES (?, ?, ?, ?)"); + insertStmt.setString(1, tiaoma); + insertStmt.setString(2, productInfo[1]); + insertStmt.setBigDecimal(3, new BigDecimal(productInfo[2])); + insertStmt.setString(4, productInfo[3]); + insertStmt.executeUpdate(); + System.out.println("增加成功"); + } + + private static void queryProduct(Scanner scanner, Connection conn) throws SQLException { + System.out.print("请输入查询的商品名称："); + String nameQuery = scanner.nextLine(); + PreparedStatement queryStmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE mingcheng LIKE ?"); + queryStmt.setString(1, "%" + nameQuery + "%"); + ResultSet rs = queryStmt.executeQuery(); + System.out.println("满足条件的记录总共" + rs.getFetchSize() + "条，信息如下："); + System.out.println("序号\t条形码\t商品名称\t单价\t供应商"); + int count = 1; + while (rs.next()) { + System.out.println(count++ + "\t" + + rs.getString("tiaoma") + "\t" + + rs.getString("mingcheng") + "\t" + + rs.getBigDecimal("danjia") + "\t" + + rs.getString("gongyingshang")); + } + } +} diff --git a/assignment1/UserLogin.java b/assignment1/UserLogin.java new file mode 100644 index 0000000..8bf2178 --- /dev/null +++ b/assignment1/UserLogin.java @@ -0,0 +1,66 @@ +package assignment1; + +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.text.SimpleDateFormat; +import java.util.Date; +import java.util.Scanner; + +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); + Connection conn = null; + PreparedStatement pstmt = null; + ResultSet rs = null; + try { + Class.forName("com.mysql.cj.jdbc.Driver"); + conn = DriverManager.getConnection(DBURL); + 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(); + System.out.print("请输入密码: "); + String password = scanner.nextLine(); + String sql = "SELECT xingming FROM t_yong WHERE yonghuming=? AND mima=?"; + pstmt = conn.prepareStatement(sql); + pstmt.setString(1, username); + pstmt.setString(2, Encrypt.MD5(password)); + rs = pstmt.executeQuery(); + if (rs.next()) { + loginSuccess = true; + String xingming = rs.getString("xingming"); + SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日HH时mm分ss秒"); + String currentTime = formatter.format(new Date()); + System.out.println("欢迎使用阳光超市收银系统"); + System.out.println("当前收银员：" + xingming); + System.out.println("当前时间：" + currentTime); + } else { + System.out.println("用户名或密码不正确，请重新输入"); + attempts++; + } + } + if (!loginSuccess) + System.out.println("最多只能尝试3次"); + } catch (Exception e) { + e.printStackTrace(); + } finally { + try { + if (rs != null) + rs.close(); + if (pstmt != null) + pstmt.close(); + if (conn != null) + conn.close(); + } catch (SQLException se) { + se.printStackTrace(); + } + } + } +} diff --git a/assignment1/商品信息.txt b/assignment1/商品信息.txt new file mode 100644 index 0000000..1463cbd --- /dev/null +++ b/assignment1/商品信息.txt @@ -0,0 +1,9 @@ +商品条码 商品名称 单价 供应商 +========================= +100001 手机 4500.00 华为 +100002 鼠标 61.00 华为 +300001 运动鞋 485 耐克 +300002 衬衣 270 雅戈尔 +300003 牛仔裤 156.5 啄木鸟 +400001 电冰箱 4500 海尔 +400002 电视机 6999 长虹 \ No newline at end of file diff --git a/assignment1/商品信息.xls b/assignment1/商品信息.xls new file mode 100644 index 0000000..6d6e33e Binary files /dev/null and b/assignment1/商品信息.xls differ diff --git a/assignment1/数据库脚本.sql b/assignment1/数据库脚本.sql new file mode 100644 index 0000000..3700108 --- /dev/null +++ b/assignment1/数据库脚本.sql @@ -0,0 +1,77 @@ +/* +Navicat MySQL Data Transfer + +Source Server : localhost_3306 +Source Server Version : 80032 +Source Host : localhost:3306 +Source Database : xiaoshou + +Target Server Type : MYSQL +Target Server Version : 80032 +File Encoding : 65001 + +Date: 2023-05-11 10:27:07 +*/ + +SET FOREIGN_KEY_CHECKS=0; + +-- ---------------------------- +-- Table structure for t_shangping +-- ---------------------------- +DROP TABLE IF EXISTS `t_shangping`; +CREATE TABLE `t_shangping` ( + `tiaoma` varchar(255) NOT NULL, + `mingcheng` varchar(255) DEFAULT NULL, + `danjia` decimal(10,2) DEFAULT NULL, + `gongyingshang` varchar(255) DEFAULT NULL, + PRIMARY KEY (`tiaoma`) +) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; + +-- ---------------------------- +-- Records of t_shangping +-- ---------------------------- +INSERT INTO `t_shangping` VALUES ('100001', '手机', '4500.00', '华为'); +INSERT INTO `t_shangping` VALUES ('100002', '鼠标', '61.00', '华为'); +INSERT INTO `t_shangping` VALUES ('100003', '矿泉水', '2.50', '农夫山泉'); +INSERT INTO `t_shangping` VALUES ('100004', '香烟', '20.00', '武汉卷烟厂'); +INSERT INTO `t_shangping` VALUES ('100005', '牙膏', '4.50', '中华牙膏厂'); +INSERT INTO `t_shangping` VALUES ('200001', '电脑', '4300.00', 'dell'); +INSERT INTO `t_shangping` VALUES ('200002', '小明同学', '5.50', '武汉饮料集团'); + +-- ---------------------------- +-- Table structure for t_shouyinmingxi +-- ---------------------------- +DROP TABLE IF EXISTS `t_shouyinmingxi`; +CREATE TABLE `t_shouyinmingxi` ( + `liushuihao` varchar(255) NOT NULL, + `tiaoma` varchar(255) DEFAULT NULL, + `mingcheng` varchar(255) DEFAULT NULL, + `danjia` decimal(10,0) DEFAULT NULL, + `shuliang` int DEFAULT NULL, + `shouyinyuan` varchar(255) DEFAULT NULL, + `xiaoshoushijian` datetime DEFAULT NULL, + PRIMARY KEY (`liushuihao`) +) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; + +-- ---------------------------- +-- Records of t_shouyinmingxi +-- ---------------------------- + +-- ---------------------------- +-- Table structure for t_yonghu +-- ---------------------------- +DROP TABLE IF EXISTS `t_yonghu`; +CREATE TABLE `t_yonghu` ( + `yonghuming` varchar(255) NOT NULL, + `mima` varchar(255) DEFAULT NULL, + `xingming` varchar(255) DEFAULT NULL, + `juese` varchar(255) DEFAULT NULL, + PRIMARY KEY (`yonghuming`) +) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; + +-- ---------------------------- +-- Records of t_yonghu +-- ---------------------------- +INSERT INTO `t_yonghu` VALUES ('niegang', null, '聂刚', '管理员'); +INSERT INTO `t_yonghu` VALUES ('wangyuxin', null, '王玉欣', '收银员'); +INSERT INTO `t_yonghu` VALUES ('xiaowang', null, '小王', '收银员'); diff --git a/excel/jxl.jar b/lib/jxl.jar similarity index 100% rename from excel/jxl.jar rename to lib/jxl.jar diff --git a/lib/mysql-connector-java.jar b/lib/mysql-connector-java.jar new file mode 100644 index 0000000..ac8904e Binary files /dev/null and b/lib/mysql-connector-java.jar differ