安卓如何连上mysql数据库

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

public class MainActivity extends AppCompatActivity {
    private static final String DB_URL = "jdbc:mysql://<数据库服务器IP>:<端口号>/<数据库名>?useUnicode=true&characterEncoding=utf-8";
    private static final String DB_USERNAME = "<数据库用户名>";
    private static final String DB_PASSWORD = "<数据库密码>";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);
            statement = connection.createStatement();
            String sql = "SELECT * FROM table_name";
            resultSet = statement.executeQuery(sql);

            while (resultSet.next()) {
                String columnName = resultSet.getString("column_name");
                // 处理获取的数据
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (resultSet != null) {
                    resultSet.close();
                }
                if (statement != null) {
                    statement.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}