normal way to save dbdata in files

package homeWork;
import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;
import org.dbunit.ext.postgresql.*;
public class dbTest {

    public static void main(String[] args) throws Exception {

        Connection conn = null;

        Statement stmt = null;

        ResultSet rset = null;
 

        String url = "jdbc:postgresql://localhost:5432/prototype";

        String user = "tk";

        String password = "";

        try{

            Class.forName("org.postgresql.Driver");

            

            conn = DriverManager.getConnection(url, user, password);

            FileOutputStream stream = new FileOutputStream("/Users/tk/foo_selects.json");

                       

            stmt = conn.createStatement();

            String sql = "select memo from foo where id = 2";

            rset = stmt.executeQuery(sql);

            

          

            while(rset.next()){

                stream.write(rset.getBytes(1));        

            }
        }

        catch (ClassNotFoundException e) {

            e.printStackTrace();

        }

        catch (SQLException e){

            e.printStackTrace();

        }

        finally {

            try {

                if(rset != null)rset.close();

                if(stmt != null)stmt.close();

                if(conn != null)conn.close();

            }

            catch (SQLException e){

                e.printStackTrace();

            }

        }

    }

}