比特币交易所java源码 比特币交易所java源码查询

比特币交易所是一个允许用户买卖比特币和其它加密货币的平台，使用Java语言实现一个简单的比特币交易所需要了解一些基本概念，如网络通信、数据库操作、加密算法等，以下是一个简单的比特币交易所Java源码示例，包括用户注册、登录、交易等功能。

1、用户模型

我们需要定义一个用户模型，包括用户名、密码、余额等信息。

public class User {
    private String username;
    private String password;
    private double balance;
    public User(String username, String password, double balance) {
        this.username = username;
        this.password = password;
        this.balance = balance;
    }
    // Getters and setters
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public double getBalance() {
        return balance;
    }
    public void setBalance(double balance) {
        this.balance = balance;
    }
}

2、数据库操作

接下来，我们需要实现数据库操作，用于存储用户信息和交易记录，这里我们使用SQLite数据库进行演示。

import java.sql.*;
public class Database {
    private Connection connection;
    public Database() {
        try {
            connection = DriverManager.getConnection("jdbc:sqlite:exchange.db");
            Statement statement = connection.createStatement();
            statement.execute("CREATE TABLE IF NOT EXISTS users (username TEXT PRIMARY KEY, password TEXT, balance REAL)");
            statement.execute("CREATE TABLE IF NOT EXISTS transactions (id INTEGER PRIMARY KEY AUTOINCREMENT, buyer TEXT, seller TEXT, amount REAL, timestamp TEXT)");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public void addUser(String username, String password, double balance) {
        try (PreparedStatement statement = connection.prepareStatement("INSERT INTO users (username, password, balance) VALUES (?, ?, ?)")) {
            statement.setString(1, username);
            statement.setString(2, password);
            statement.setDouble(3, balance);
            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public User getUser(String username) {
        try (PreparedStatement statement = connection.prepareStatement("SELECT * FROM users WHERE username = ?")) {
            statement.setString(1, username);
            ResultSet resultSet = statement.executeQuery();
            if (resultSet.next()) {
                return new User(username, resultSet.getString("password"), resultSet.getDouble("balance"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    public void addTransaction(String buyer, String seller, double amount, String timestamp) {
        try (PreparedStatement statement = connection.prepareStatement("INSERT INTO transactions (buyer, seller, amount, timestamp) VALUES (?, ?, ?, ?)")) {
            statement.setString(1, buyer);
            statement.setString(2, seller);
            statement.setDouble(3, amount);
            statement.setString(4, timestamp);
            statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

3、用户注册和登录

接下来，我们需要实现用户注册和登录功能。

import java.util.Scanner;
public class Exchange {
    private Database database;
    public Exchange() {
        database = new Database();
    }
    public void registerUser() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter username: ");
        String username = scanner.nextLine();
        System.out.print("Enter password: ");
        String password = scanner.nextLine();
        System.out.print("Enter initial balance: ");
        double balance = scanner.nextDouble();
        database.addUser(username, password, balance);
        System.out.println("User registered successfully!");
    }
    public void loginUser() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter username: ");
        String username = scanner.nextLine();
        User user = database.getUser(username);
        if (user != null) {
            System.out.print("Enter password: ");
            String password = scanner.nextLine();
            if (user.getPassword().equals(password)) {
                System.out.println("Login successful!");
                // Proceed with trading
            } else {
                System.out.println("Invalid password!");
            }
        } else {
            System.out.println("User not found!");
        }
    }
}

4、交易功能

我们需要实现交易功能，包括买入和卖出。

public class Exchange {
    // ... (previous code)
    public void trade() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter buyer username: ");
        String buyer = scanner.nextLine();
        System.out.print("Enter seller username: ");
        String seller = scanner.nextLine();
        System.out.print("Enter amount: ");
        double amount = scanner.nextDouble();
        User buyerUser = database.getUser(buyer);
        User sellerUser = database.getUser(seller);
        if (buyerUser != null && sellerUser != null && buyerUser.getBalance() >= amount) {
            buyerUser.setBalance(buyerUser.getBalance() - amount);
            sellerUser.setBalance(sellerUser.getBalance() + amount);
            database.addTransaction(buyer, seller, amount, new java.util.Date().toString());
            System.out.println("Trade successful!");
        } else {
            System.out.println("Trade failed!");
        }
    }
}

这个示例展示了如何使用Java实现一个简单的比特币交易所，包括用户注册、登录和交易功能，当然，实际的比特币交易所会更加复杂，涉及到加密货币钱包、交易对、订单匹配等高级功能，为了确保安全性，还需要实现加密通信、防止SQL注入等安全措施。