用Java将数据库中的数据写入文件

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.*;

public class DatabaseToFile {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";
        String query = "SELECT * FROM mytable";
        String filePath = "output.txt";

        try (Connection connection = DriverManager.getConnection(url, username, password);
             Statement statement = connection.createStatement();
             ResultSet resultSet = statement.executeQuery(query);
             BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {

            while (resultSet.next()) {
                // 根据数据库表的列名获取对应的数据
                String data = resultSet.getString("column_name");
                // 将数据写入文件
                writer.write(data);
                writer.newLine();
            }
        } catch (SQLException | IOException e) {
            e.printStackTrace();
        }
    }
}