Eu quero exibir várias imagens do banco de dados em jsp (estou mapeando servlet), então em jsp m vou exibir no src da tag img

 <% // dbconnection
          try {
                   Class.forName("com.mysql.jdbc.Driver");
                 java.sql.Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","");
                  Statement statement = conn.createStatement() ;
       resultSet=statement.executeQuery("select * from product") ; 
                %> 
    <!--this loop will get all images-->
       <% while(resultSet.next()){ %> 
    <!--I'm using id column of table,you can use any coulmn which is unique to all row-->
   Image - <img src="./Serv1?id=<%=resultSet.getString("id")%>" width="20%"/>
  < p>Product <%=r.getInt(1)%>: <%=r.getString(2)%></p>

    <% 
    }
    }catch(Exception e){}

    %>

Blob image = null;
        byte[] imgData = null;
       String id= request.getParameter("id");//here you are getting id 
       int i;
       ResultSet rs =null;

 try {

            //loading drivers for mysql
           Class.forName("com.mysql.jdbc.Driver");
             Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","");


         String sql = "SELECT prodimg FROM product where id=?"; //here pass that id in query to get particular image 

           PreparedStatement ps = con.prepareStatement(sql);


               ps.setString(1, id);
              rs = ps.executeQuery();    
 while (rs.next()) {
                  image = rs.getBlob("image");//getting image from database 
                  imgData = image.getBytes(1,(int)image.length()); //extra info about image
                } 

response.setContentType("image/gif");//setting response type



OutputStream o = response.getOutputStream();

o.write(imgData);//sending the image to jsp page 
o.flush();
o.close();


 }
    catch(Exception e)
         {
             e.printStackTrace();

         }