java.sql.SQLException:打开连接时出错

// 确保数据库URL、用户名和密码正确
String url = "jdbc:mysql://localhost:3306/mydatabase";
String user = "myuser";
String password = "mypassword";

try (Connection conn = DriverManager.getConnection(url, user, password)) {
    // 连接成功
} catch (SQLException e) {
    e.printStackTrace();
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseConnectionExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "myuser";
        String password = "mypassword";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            System.out.println("连接成功！");
        } catch (SQLException e) {
            System.err.println("连接失败: " + e.getMessage());
            e.printStackTrace();
        }
    }
}