java银行存取款系统mysql

您的问题是关于Java银行存取款系统与MySQL的相关问题。我可以给您提供一些基本的信息：

Java银行存取款系统：Java是一种广泛使用的编程语言，可以用来开发各种类型的应用程序。在银行领域，Java可以用来开发银行存取款系统。这种系统可以让用户通过电子渠道（比如ATM机、网银等）进行存款、取款、转账等操作。

MySQL：MySQL是一种常用的关系型数据库管理系统，可以用来存储和管理银行存取款系统中的各种数据。比如，可以用MySQL来存储用户信息、账户余额、交易记录等数据。

在Java银行存取款系统中，可以通过Java程序来连接MySQL数据库，进行数据的读取、更新、插入等操作。通常，需要使用一些Java库（比如JDBC）来实现这些功能。

希望这些信息对您有所帮助。如果您有更具体的问题，可以进一步提出，我会尽力回答。

相关问题

java银行存取款系统mysql的代码

很抱歉，由于Java银行存取款系统与MySQL的代码实现非常复杂，完整的代码无法在此处提供。但是，我可以给出一些基本的代码示例，帮助您理解Java和MySQL之间的交互过程。

首先，您需要使用Java代码来连接MySQL数据库。这可以通过以下代码实现：

import java.sql.*;

public class MySQLAccess {
  private Connection connect = null;
  private Statement statement = null;
  private PreparedStatement preparedStatement = null;
  private ResultSet resultSet = null;

  public void readDataBase() throws Exception {
    try {
      // 连接到MySQL数据库
      Class.forName("com.mysql.jdbc.Driver");
      connect = DriverManager
          .getConnection("jdbc:mysql://localhost/feedback?"
              + "user=sqluser&password=sqluserpw");

      // 执行查询
      statement = connect.createStatement();
      resultSet = statement
          .executeQuery("select * from feedback.comments");
      writeResultSet(resultSet);

    } catch (Exception e) {
      throw e;
    } finally {
      close();
    }

  }

  private void writeResultSet(ResultSet resultSet) throws SQLException {
    // 打印查询结果
    while (resultSet.next()) {
      String user = resultSet.getString("myuser");
      String website = resultSet.getString("webpage");
      String summary = resultSet.getString("summary");
      Date date = resultSet.getDate("datum");
      String comment = resultSet.getString("comments");
      System.out.println("User: " + user);
      System.out.println("Website: " + website);
      System.out.println("Summary: " + summary);
      System.out.println("Date: " + date);
      System.out.println("Comment: " + comment);
    }
  }

  // 关闭连接
  private void close() {
    try {
      if (resultSet != null) {
        resultSet.close();
      }

      if (statement != null) {
        statement.close();
      }

      if (connect != null) {
        connect.close();
      }
    } catch (Exception e) {

    }
  }
}

在上述代码中，我们通过`DriverManager.getConnection()`方法连接到MySQL数据库，然后使用`Statement`对象执行查询语句，并通过`ResultSet`对象获取查询结果。

除了查询外，您还可以使用Java代码来插入、更新和删除MySQL数据库中的数据。以下是插入数据的示例代码：

// 插入数据
statement = connect.createStatement();
statement.executeUpdate("INSERT INTO feedback.comments "
    + "VALUES (default, 'myuser', 'mypage', 'test', "
    + "now(), 'this is a test')");

如果您需要更详细的Java代码示例，请参考以下资源：

- [Java MySQL CRUD Example Tutorial](https://www.journaldev.com/8758/java-mysql-crud-example-tutorial)
- [Java MySQL Connectivity Example](https://www.javatpoint.com/example-to-connect-to-the-mysql-database)

java课程设计银行存取款操作系统

以下是一个Java银行存取款操作系统的简单实现，包括用户注册、登录、修改密码、余额查询、充值、转账和取款等功能。该系统使用MySQL数据库存储用户信息和交易记录，并采用正则表达式对用户输入进行规范化处理。

import java.sql.*;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class BankSystem {
    private static final String DB_URL = "jdbc:mysql://localhost:3306/bank";
    private static final String DB_USER = "root";
    private static final String DB_PASSWORD = "123456";

    private static Connection conn = null;
    private static Statement stmt = null;
    private static ResultSet rs = null;

    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);
            stmt = conn.createStatement();
            System.out.println("欢迎使用银行存取款管理系统！");
            while (true) {
                System.out.println("请选择操作：");
                System.out.println("1.用户注册 2.用户登录 3.退出系统");
                int choice = scanner.nextInt();
                scanner.nextLine();
                switch (choice) {
                    case 1:
                        register();
                        break;
                    case 2:
                        login();
                        break;
                    case 3:
                        System.out.println("感谢使用银行存取款管理系统！");
                        System.exit(0);
                    default:
                        System.out.println("无效的选择，请重新输入！");
                }
            }
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    private static void register() throws SQLException {
        System.out.println("请输入用户名：");
        String username = scanner.nextLine();
        if (usernameExists(username)) {
            System.out.println("该用户名已存在，请重新输入！");
            return;
        }
        System.out.println("请输入密码：");
        String password = scanner.nextLine();
        if (!isValidPassword(password)) {
            System.out.println("密码不符合规范，请重新输入！");
            return;
        }
        System.out.println("请输入初始余额：");
        double balance = scanner.nextDouble();
        scanner.nextLine();
        String sql = "INSERT INTO users (username, password, balance) VALUES ('" + username + "', '" + password + "', " + balance + ")";
        stmt.executeUpdate(sql);
        System.out.println("注册成功！");
    }

    private static void login() throws SQLException {
        System.out.println("请输入用户名：");
        String username = scanner.nextLine();
        if (!usernameExists(username)) {
            System.out.println("该用户名不存在，请重新输入！");
            return;
        }
        System.out.println("请输入密码：");
        String password = scanner.nextLine();
        String sql = "SELECT * FROM users WHERE username='" + username + "' AND password='" + password + "'";
        rs = stmt.executeQuery(sql);
        if (rs.next()) {
            System.out.println("登录成功！");
            while (true) {
                System.out.println("请选择操作：");
                System.out.println("1.修改密码 2.余额查询 3.充值 4.转账 5.取款 6.返回上一级");
                int choice = scanner.nextInt();
                scanner.nextLine();
                switch (choice) {
                    case 1:
                        changePassword(username);
                        break;
                    case 2:
                        checkBalance(username);
                        break;
                    case 3:
                        deposit(username);
                        break;
                    case 4:
                        transfer(username);
                        break;
                    case 5:
                        withdraw(username);
                        break;
                    case 6:
                        return;
                    default:
                        System.out.println("无效的选择，请重新输入！");
                }
            }
        } else {
            System.out.println("密码错误，请重新输入！");
        }
    }

    private static void changePassword(String username) throws SQLException {
        System.out.println("请输入旧密码：");
        String oldPassword = scanner.nextLine();
        String sql = "SELECT * FROM users WHERE username='" + username + "' AND password='" + oldPassword + "'";
        rs = stmt.executeQuery(sql);
        if (rs.next()) {
            System.out.println("请输入新密码：");
            String newPassword = scanner.nextLine();
            if (!isValidPassword(newPassword)) {
                System.out.println("密码不符合规范，请重新输入！");
                return;
            }
            sql = "UPDATE users SET password='" + newPassword + "' WHERE username='" + username + "'";
            stmt.executeUpdate(sql);
            System.out.println("密码修改成功！");
        } else {
            System.out.println("旧密码错误，请重新输入！");
        }
    }

    private static void checkBalance(String username) throws SQLException {
        String sql = "SELECT balance FROM users WHERE username='" + username + "'";
        rs = stmt.executeQuery(sql);
        if (rs.next()) {
            double balance = rs.getDouble("balance");
            System.out.println("当前余额为：" + balance);
        }
    }

    private static void deposit(String username) throws SQLException {
        System.out.println("请输入充值金额：");
        double amount = scanner.nextDouble();
        scanner.nextLine();
        String sql = "UPDATE users SET balance=balance+" + amount + " WHERE username='" + username + "'";
        stmt.executeUpdate(sql);
        sql = "INSERT INTO transactions (username, type, amount) VALUES ('" + username + "', '充值', " + amount + ")";
        stmt.executeUpdate(sql);
        System.out.println("充值成功！");
    }

    private static void transfer(String username) throws SQLException {
        System.out.println("请输入对方用户名：");
        String toUsername = scanner.nextLine();
        if (!usernameExists(toUsername)) {
            System.out.println("该用户名不存在，请重新输入！");
            return;
        }
        System.out.println("请输入转账金额：");
        double amount = scanner.nextDouble();
        scanner.nextLine();
        String sql = "SELECT balance FROM users WHERE username='" + username + "'";
        rs = stmt.executeQuery(sql);
        if (rs.next()) {
            double balance = rs.getDouble("balance");
            if (balance < amount) {
                System.out.println("余额不足，转账失败！");
                return;
            }
            sql = "UPDATE users SET balance=balance-" + amount + " WHERE username='" + username + "'";
            stmt.executeUpdate(sql);
            sql = "UPDATE users SET balance=balance+" + amount + " WHERE username='" + toUsername + "'";
            stmt.executeUpdate(sql);
            sql = "INSERT INTO transactions (username, type, amount) VALUES ('" + username + "', '转账', -" + amount + ")";
            stmt.executeUpdate(sql);
            sql = "INSERT INTO transactions (username, type, amount) VALUES ('" + toUsername + "', '转账', " + amount + ")";
            stmt.executeUpdate(sql);
            System.out.println("转账成功！");
        }
    }

    private static void withdraw(String username) throws SQLException {
        System.out.println("请输入取款金额：");
        double amount = scanner.nextDouble();
        scanner.nextLine();
        String sql = "SELECT balance FROM users WHERE username='" + username + "'";
        rs = stmt.executeQuery(sql);
        if (rs.next()) {
            double balance = rs.getDouble("balance");
            if (balance < amount) {
                System.out.println("余额不足，取款失败！");
                return;
            }
            sql = "UPDATE users SET balance=balance-" + amount + " WHERE username='" + username + "'";
            stmt.executeUpdate(sql);
            sql = "INSERT INTO transactions (username, type, amount) VALUES ('" + username + "', '取款', -" + amount + ")";
            stmt.executeUpdate(sql);
            System.out.println("取款成功！");
        }
    }

    private static boolean usernameExists(String username) throws SQLException {
        String sql = "SELECT * FROM users WHERE username='" + username + "'";
        rs = stmt.executeQuery(sql);
        return rs.next();
    }

    private static boolean isValidPassword(String password) {
        String regex = "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}$";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(password);
        return matcher.matches();
    }
}