JSP (Java Server Page) - Mostrar imagenes(ya sean jpg o gif) en una JSP

<%@ page language="java" import="java.sql.*, javax.naming.*" %>

<%@ page import="java.util.*" %>

<%@ page import="java.net.URL" %>

<%@ page import="java.lang.Object" %>

<%@ page import="java.io.*" %>

<%@ page language="java" import="java.sql.*" errorPage="ERROR.jsp" %>

<jsp:useBean id="conexion" class="py.utic.conexion.BDConexion" scope="page" />

<jsp:useBean id="dataSource" class="py.utic.conexion.FuenteDato" scope="page"/>

<%@ include file="CHEQUEARSESION.jsp" %>

<%

  // Crear objeto de conexion al DB

  Connection cn = conexion.crearConexion();

  // Asignar conexion al objeto manejador de datos

  dataSource.setConexion(cn);

      //String id = request.getParameter("a");

      String id = request.getParameter("a");

      System.out.println("Esto sale en la ventana output \n"+id);

      String sql = "select imagen from imagenes"

            + " where id_imagen =" + id;

          ResultSet rs = dataSource.obtenerDato(sql);

          if  (rs.next()){

              byte[] bin = rs.getBytes("imagen");

              if (bin==null){

                  out.println("NO EXISTE LA IMAGEN");

              }else{

                  //InputStream inStream = bin.getBinaryStream();

                  InputStream inStream = rs.getBinaryStream("imagen");

                  int size = (int)bin.length;

                  byte[] buffer = new byte[size];

                  response.setContentType("image/jpeg");

                  response.setContentLength(size);

                  ServletOutputStream ouputStream = response.getOutputStream();

                  int length = -1;

                  while ((length = inStream.read(buffer)) != -1)

                  {

                      ouputStream.write(buffer, 0, length);

                  }

                  ouputStream.flush();

                  ouputStream.close();

               }

          }//fin del if

      conexion.cerrarConexion(cn);

%>