Sending fields to servlets

I am trying to create an auction website. I have a table that contains the item data. What I want is, when a user clicks on "Buy item", to get the item id of this specific item, so that I can tell it is a bought item. Here is the code from the jsp.

Code:

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int itemnumber = ItemDAO.getitemRowcount();               
        for(int i = 0; i < itemnumber; i++) {
                ItemBean bean = new ItemBean();
                bean.setItemid(i+1);
// I want to have this id on the server side, when "Buy item" is pressed, and the jsp is sent to BuyitemServlet
                bean= ItemDAO.getItems(bean);
                String itemtitle = bean.getItemTitle();
                String itemdescription = bean.getItemDescription();
                double itemprice = bean.getPrice();%>                               
                <tr>
                <td> Image </td>
                <td> <%= itemtitle %> </td>
                <td> <%= itemdescription%> </td>
                <td> <%=itemprice%> </td>               
                <td>
                <form action ="BuyItemServlet" method = "post" >
                <input type = "submit" value = "Buy item">
                </td>
                </tr>
                </form>
        <%       
        }

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