Html form, radio button and Servlet

Question

Hi, I've writen a servlet that builds an html page showing the content of a database. The code is:

Statement st = (Statement) conexion.createStatement();                     
ResultSet rs = st.executeQuery("select * from audiolist" );
while (rs.next())
   {
    contador++;
    out.println("<tr>");
    String k = rs.getString("Tittle");
    String l = rs.getString("Autor");
    String m = rs.getString("Album");
    out.println("<td>"+"<input type=\"radio\" name=\"titulo<%="+contador+"%>\"value=\""+k+"\">");
    out.println("<td>" + k + "</td>");         
    out.println("<td>" + l + "</td>");
    out.println("<td>" + m + "</td>");    
    out.println("</tr>");
    }
    out.println("</table></center>");
    out.println("<tr><td colspan=2><input type=submit></td></tr>");
    out.println("</form>");

I've added a radio button to each row. With this code I get to show in the browser a table with the content of the database. When I click on submit I want send to another servlet the vale 'k' for the row selected. I'm having a hard time with this. I think I'm sending the value incorrectly. In the second servlet, is it enough to use getParameter() in order to get the info?

Thanks!

Answer 1

In the second servlet you can use:

String value = request.getParameter("tituloX");

to read the value. You need to know the name of the parameter to do. If this is not known, you can try to enumerate the parameters:

for ( Enumeration e = request.getParameterNames(); e.hasMoreElements();) {
  String param = (String) e.nextElement();
  String value = request.getParameter(param );
}

This only works for parameters with a single value.

Answer 2

Is this line correct?

out.println("<td>"+"<input type=\"radio\" name=\"titulo<%="+contador+"%>\"value=\""+k+"\">");