Java小玩意：模拟ATM
Java小玩意：模拟ATM
一、写在前面
本来是其他班的作业，原本是用来练习集合存储对象，正好最近学了JDBC，缺个小玩意练习，这不缺啥来啥吗，然后就写了这个小屎山😅
纯手写，欢迎指正。
二、功能介绍
- 注册&登录
- 存取款
- 查询
- 转账
- 修改信息
效果展示
三、基本逻辑
- 登录：获取输入的ID，到数据库中查询此ID的用户信息，查询成功则创建此用户对象，否则提示错误
- 注册：用户需要输入用户名，性别，登录密码等信息，然后自动生成ID，然后将用户信息存储到数据库中
- 存取款：用户输入需要存取的金额，在此对象对应的“余额”属性中对应增加或减少相应数额，然后再更新数据库
- 转账：用户输入转向的ID后，在数据库中查询此ID对应的用户信息，查询成功则创建此用户对象没否则提示错误。输入转账金额后，两个用户对象的“余额”属性同时增加和减少转账的数额，然后更新数据库
- 修改信息：将此用户对象的属性更改后，更新数据库。
四、数据库结构
CREATE TABLE `account` (
`uid` varchar(18) COLLATE utf8mb4_general_ci NOT NULL,
`userName` varchar(10) COLLATE utf8mb4_general_ci NOT NULL,
`passwd` varchar(12) COLLATE utf8mb4_general_ci NOT NULL,
`balance` double DEFAULT NULL,
`xianE` double DEFAULT NULL,
`gender` varchar(2) COLLATE utf8mb4_general_ci NOT NULL,
PRIMARY KEY (`uid`)
)五、关键代码
注册
public void createAccount() throws SQLException {
Account account = new Account();
account.createName();
account.createGender();
account.createPasswd();
account.createBalance();
account.createXianE();
// 随机生成3个3位数字
Random ran = new Random();
int ID1 = ran.nextInt(100, 1000);
int ID2 = ran.nextInt(100, 1000);
int ID3 = ran.nextInt(100, 1000);
String ID = "" + ID1 + ID2 + ID3;
Integer uID = Integer.parseInt(ID);
account.setuID(uID);
Connection conn;
{
try {
conn = DriverManager.getConnection(url, user, password);
PreparedStatement ps;
{
try {
String sql = "insert into account (uid,userName,gender, passwd, balance, xianE) values ( ?,?, ?, ?, ?, ?)";
ps = conn.prepareStatement(sql);
ps.setString(1, String.valueOf(account.getuID()));
ps.setString(2, account.getUserName());
ps.setString(3, account.getGender());
ps.setString(4, account.getPasswd());
ps.setDouble(5, account.getBalance());
ps.setDouble(6, account.getXianE());
ps.executeUpdate();
}; catch (SQLException e) {
throw new RuntimeException(e);
};
try {
ps.close();
conn.close();
}; catch (SQLException e) {
throw new RuntimeException(e);
};
};
}; catch (SQLException e) {
throw new RuntimeException(e);
};
};
System.out.println("注册成功！");
System.out.println(account);
System.out.println("即将返回主界面...");
};登录
public Account login() {
Account account = new Account();
String[] userInfo;
System.out.println("请输入您的ID：");
int uID = new Scanner(System.in).nextInt();
// 接收用户输入后去数据库里查询信息
JDBC jdbc = new JDBC();
String sql = "select * from account where uid = " + uID;
try {
// 将查询到的用户信息保存到userInfo中
userInfo = jdbc.getUserInfo(sql);
if (userInfo == null) {
System.out.println("无此用户，请重新输入");
account = login();
}; else {
// 密码认证
boolean autFlag = autPasswd(userInfo);
for (int i = 0; true; i++) {
// 若认证密码返回true，将查询到的信息赋给account对象
if (autFlag) {
account.setuID(Integer.parseInt(userInfo[0]));
account.setUserName(userInfo[1]);
account.setPasswd(userInfo[2]);
account.setBalance(Double.parseDouble(userInfo[3]));
account.setXianE(Double.parseDouble(userInfo[4]));
account.setGender(userInfo[5]);
System.out.println("登录成功...");
break;
}; else {
System.out.println("密码错误，请重新输入!");
System.out.println("您还有" + (2 - i) + "次机会");
autFlag = autPasswd(userInfo);
};
if (i == 2) {
System.out.println("密码错误次数过多，程序退出，感谢您的使用！");
System.exit(0);
};
};
};
}; catch (SQLException e) {
throw new RuntimeException(e);
};
return account;
};登录成功后显示菜单
public void showMenu(Account account) {
if (this.getGender().equals("男")) {
System.out.println("您好，" + account.getUserName() + "先生，欢迎使用ATM机！");
}; else if (this.getGender().equals("女")) {
System.out.println("您好，" + account.getUserName() + "女士，欢迎使用ATM机！");
}; else {
System.out.println("您好，" + account.getUserName() + "，欢迎使用ATM机！");
};
System.out.println("请选择您要进行的操作：");
System.out.println("1.存款");
System.out.println("2.取款");
System.out.println("3.转账");
System.out.println("4.查询余额");
System.out.println("5.修改账户信息");
System.out.println("6.退出");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
};这里会根据用户信息显示“某某先生”还是”某某女士“；
转账
public void transferMoney(Account account) {
Account transferAccount = new Account();
System.out.println("请输入您要转账的账户ID：");
int uID = new Scanner(System.in).nextInt();
String[] transferUserInfo;
JDBC jdbc = new JDBC();
String sql = "select * from account where uid = " + uID;
try {
transferUserInfo = jdbc.getUserInfo(sql);
if (transferUserInfo == null) {
System.out.println("无此用户，请重新输入");
transferMoney(account);
}; else {
transferAccount.setuID(Integer.parseInt(transferUserInfo[0]));
transferAccount.setUserName(transferUserInfo[1]);
transferAccount.setPasswd(transferUserInfo[2]);
transferAccount.setBalance(Double.parseDouble(transferUserInfo[3]));
transferAccount.setXianE(Double.parseDouble(transferUserInfo[4]));
};
}; catch (SQLException e) {
throw new RuntimeException(e);
};
System.out.println("请确认您要转账的账户信息：");
System.out.println("账户ID：" + transferAccount.getuID());
System.out.println("用户名：" + transferAccount.getUserName());
System.out.println("请输入您要转账的金额：");
double money = new Scanner(System.in).nextDouble();
double thisBalance = account.getBalance();
double thatBalance = transferAccount.getBalance();
thisBalance -= money;
thatBalance += money;
account.setBalance(thisBalance);
transferAccount.setBalance(thatBalance);
sql = "update account set balance = " + thisBalance + " where uid = " + account.getuID();
jdbc.update(sql);
sql = "update account set balance = " + thatBalance + " where uid = " + transferAccount.getuID();
jdbc.update(sql);
System.out.println("转账成功，您的余额为：" + thisBalance);
showMenu(account);
};修改信息
private void updateAccount(Account account) {
JDBC jdbc = new JDBC();
System.out.println("更新账户信息：");
System.out.println(account.getUserName());
System.out.println(account.getPasswd());
System.out.println(account.getXianE());
System.out.println("请输入您要更新的信息：");
System.out.println("1.用户名");
System.out.println("2.密码");
System.out.println("3.取款限额");
System.out.println("4.返回上级菜单");
Scanner scanner = new Scanner(System.in);
int choice = scanner.nextInt();
switch (choice) {
case 1:
System.out.println("请输入您的新用户名：");
String newUserName = scanner.next();
account.setUserName(newUserName);
String sql = "update account set username = '" + account.getUserName() + "' where uid = " + account.getuID();
jdbc.update(sql);
System.out.println("更新成功！");
updateAccount(account);
break;
case 2:
System.out.println("请输入您的新密码：");
String newPasswd = scanner.next();
account.setPasswd(newPasswd);
String sql1 = "update account set passwd = '" + account.getPasswd() + "' where uid = " + account.getuID();
jdbc.update(sql1);
System.out.println("更新成功！");
updateAccount(account);
break;
case 3:
System.out.println("请输入您的新取款限额：");
double newXianE = scanner.nextDouble();
account.setXianE(newXianE);
String sql2 = "update account set xiane = " + account.getXianE() + " where uid = " + account.getuID();
jdbc.update(sql2);
System.out.println("更新成功！");
updateAccount(account);
break;
case 4:
showMenu(account);
break;
default:
System.out.println("输入错误，请重新输入！");
updateAccount(account);
break;
};
};六、源码
源码已上传Github，Cikian/Simulated_ATM-Java-： java+MySQL模拟ATM
- 克隆代码到本地，在本地或者服务器新建MySQL数据库：atm_account
- 导入sql目录下的sql文件建表及插入测试数据
- 修改cfg.properties文件中的各字段即可
本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2022-11-17，如有侵权请联系 cloudcommunity@tencent.com 删除
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