根据文件步骤依据JDK环境下的JAVA环境为基础写出相应的JAVA代码

根据提供的文档内容，我将为你编写一个简单的Java类 `FlightQuery`，用于实现航班查询功能。这个类将连接到MySQL数据库，并根据用户输入的出发地、目的地和出发时间查询航班信息。

### 1. 导入必要的包

首先，我们需要导入一些必要的包：

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Date;

### 2. 创建 `Flight` 类

定义一个 `Flight` 类来表示航班对象：

public class Flight {
    private String flightNumber;
    private String airline;
    private String departureAirport;
    private String arrivalAirport;
    private Date departureTime;
    private Date arrivalTime;
    private double fare;
    private int remainingTickets;

    // Getters and Setters
    public String getFlightNumber() {
        return flightNumber;
    }

    public void setFlightNumber(String flightNumber) {
        this.flightNumber = flightNumber;
    }

    public String getAirline() {
        return airline;
    }

    public void setAirline(String airline) {
        this.airline = airline;
    }

    public String getDepartureAirport() {
        return departureAirport;
    }

    public void setDepartureAirport(String departureAirport) {
        this.departureAirport = departureAirport;
    }

    public String getArrivalAirport() {
        return arrivalAirport;
    }

    public void setArrivalAirport(String arrivalAirport) {
        this.arrivalAirport = arrivalAirport;
    }

    public Date getDepartureTime() {
        return departureTime;
    }

    public void setDepartureTime(Date departureTime) {
        this.departureTime = departureTime;
    }

    public Date getArrivalTime() {
        return arrivalTime;
    }

    public void setArrivalTime(Date arrivalTime) {
        this.arrivalTime = arrivalTime;
    }

    public double getFare() {
        return fare;
    }

    public void setFare(double fare) {
        this.fare = fare;
    }

    public int getRemainingTickets() {
        return remainingTickets;
    }

    public void setRemainingTickets(int remainingTickets) {
        this.remainingTickets = remainingTickets;
    }
}

### 3. 创建 `FlightQuery` 类

定义一个 `FlightQuery` 类来实现航班查询功能：

public class FlightQuery {

    // 数据库连接信息
    private static final String URL = "jdbc:mysql://localhost:3306/airline_system";
    private static final String USER = "root";
    private static final String PASSWORD = "password";

    /**
     * 根据出发地、目的地和出发时间查询航班信息
     *
     * @param departure 出发地
     * @param destination 目的地
     * @param departureTime 出发时间
     * @return 符合条件的航班列表
     */
    public List<Flight> queryFlights(String departure, String destination, Date departureTime) {
        List<Flight> flights = new ArrayList<>();
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;

        try {
            // 连接到数据库
            connection = DriverManager.getConnection(URL, USER, PASSWORD);

            // 编写SQL查询语句
            String sql = "SELECT * FROM flight WHERE departure_airport = ? AND arrival_airport = ? AND departure_time >= ?";
            statement = connection.prepareStatement(sql);

            // 设置参数
            statement.setString(1, departure);
            statement.setString(2, destination);
            statement.setDate(3, new java.sql.Date(departureTime.getTime()));

            // 执行查询
            resultSet = statement.executeQuery();

            // 处理查询结果
            while (resultSet.next()) {
                Flight flight = new Flight();
                flight.setFlightNumber(resultSet.getString("flight_number"));
                flight.setAirline(resultSet.getString("airline"));
                flight.setDepartureAirport(resultSet.getString("departure_airport"));
                flight.setArrivalAirport(resultSet.getString("arrival_airport"));
                flight.setDepartureTime(resultSet.getTimestamp("departure_time"));
                flight.setArrivalTime(resultSet.getTimestamp("arrival_time"));
                flight.setFare(resultSet.getDouble("fare"));
                flight.setRemainingTickets(resultSet.getInt("remaining_tickets"));

                flights.add(flight);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (resultSet != null) resultSet.close();
                if (statement != null) statement.close();
                if (connection != null) connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        return flights;
    }
}

### 4. 使用 `FlightQuery` 类

下面是一个简单的示例，演示如何使用 `FlightQuery` 类查询航班信息：

public class Main {
    public static void main(String[] args) {
        FlightQuery flightQuery = new FlightQuery();

        // 示例查询条件
        String departure = "北京首都机场";
        String destination = "上海浦东机场";
        Date departureTime = new Date(System.currentTimeMillis());

        // 执行查询
        List<Flight> flights = flightQuery.queryFlights(departure, destination, departureTime);

        // 输出查询结果
        for (Flight flight : flights) {
            System.out.println("航班号: " + flight.getFlightNumber());
            System.out.println("航空公司: " + flight.getAirline());
            System.out.println("出发机场: " + flight.getDepartureAirport());
            System.out.println("到达机场: " + flight.getArrivalAirport());
            System.out.println("出发时间: " + flight.getDepartureTime());
            System.out.println("到达时间: " + flight.getArrivalTime());
            System.out.println("票价: " + flight.getFare());
            System.out.println("余票数量: " + flight.getRemainingTickets());
            System.out.println("------------------------");
        }
    }
}

### 5. 注意事项

1. **数据库连接信息**：请确保 `URL`、`USER` 和 `PASSWORD` 是正确的，与你的数据库配置相匹配。
2. **日期格式**：确保传入的 `Date` 对象格式与数据库中的日期格式一致。
3. **异常处理**：在实际应用中，建议对异常进行更详细的处理，以提高系统的健壮性。

以上代码实现了一个基本的航班查询功能。你可以在此基础上扩展更多功能，如订票、支付等。