registration_idを取得する用のjsp

do.jsp

<%@ page import="java.util.Enumeration" %>
<%
    Enumeration<String> en = request.getParameterNames();
    while (en.hasMoreElements()) {
        String name = en.nextElement();
        System.out.print(name + " = ");
        System.out.println("" + request.getParameter(name));
    }
    out.println("fin.");
%>