java code for Print the request headers and the session attributes

<%--
Copyright (c) 2002 by Phil Hanna
All rights reserved.

You may study, use, modify, and distribute this
software for any purpose provided that this
copyright notice appears in all copies.

This software is provided without warranty
either expressed or implied.
--%>
<%@ page
errorPage="ErrorPage.jsp"
import="java.io.*"
import="java.util.*"
%>

<%
Enumeration enames;
Map map;
String title;

// Print the request headers

map = new TreeMap();
enames = request.getHeaderNames();
while (enames.hasMoreElements()) {
String name = (String) enames.nextElement();
String value = request.getHeader(name);
map.put(name, value);
}
out.println(createTable(map, "Request Headers"));

// Print the session attributes

map = new TreeMap();
enames = session.getAttributeNames();
while (enames.hasMoreElements()) {
String name = (String) enames.nextElement();
String value = "" + session.getAttribute(name);
map.put(name, value);
}
out.println(createTable(map, "Session Attributes"));

%>

<%-- Define a method to create an HTML table --%>

<%!
private static String createTable(Map map, String title)
{
StringBuffer sb = new StringBuffer();

// Generate the header lines

sb.append("");
sb.append("");
sb.append("");
sb.append("");

// Generate the table rows

Iterator imap = map.entrySet().iterator();
while (imap.hasNext()) {
Map.Entry entry = (Map.Entry) imap.next();
String key = (String) entry.getKey();
String value = (String) entry.getValue();
sb.append("");
sb.append("");
sb.append("");
sb.append("");
}

// Generate the footer lines

sb.append("

"); sb.append(title); sb.append("
"); sb.append(key); sb.append("	"); sb.append(value); sb.append("

");

// Return the generated HTML

return sb.toString();
}
%>