xixu-me/some-java-packages
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add package assignment1

Browse Source
This commit is contained in:
xixu-me committed 2024-05-13 22:48:50 +08:00
1 parent d6e67e683c
commit 112d58e3a0
10 files changed
+361 -4
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

.vscode/settings.json
Vendored
+3 -4
View File
@@ -1,7 +1,6 @@
{
"java.project.explorer.showNonJavaResources": false,
"java.project.referencedLibraries": [
"lib/**/*.jar",
"excel/jxl.jar"
],
"java.project.explorer.showNonJavaResources": false
"lib/**/*.jar"
]
}
assignment1/Encrypt.java
+30
View File
@@ -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"));
}
}
assignment1/PasswordChange.java
+91
View File
@@ -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();
}
}
assignment1/SupermarketManagement.java
+85
View File
@@ -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"));
}
}
}
assignment1/UserLogin.java
+66
View File
@@ -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();
}
}
}
}
assignment1/商品信息.txt
+9
View File
@@ -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
assignment1/商品信息.xls
BIN
View File
Binary file not shown.
assignment1/数据库脚本.sql
+77
View File
@@ -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');
excel/jxl.jar → lib/jxl.jar
View File
File renamed without changes.
lib/mysql-connector-java.jar
BIN
View File
Binary file not shown.