何时打开以及何时使用Java servlet关闭mysql连接？

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MyServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 打开MySQL连接
        Connection connection = null;
        try {
            // 加载驱动程序
            Class.forName("com.mysql.jdbc.Driver");

            // 建立数据库连接
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 执行数据库操作
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT * FROM mytable");

            // 处理结果集
            while (resultSet.next()) {
                // 处理数据
            }

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