package se452examples;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

import org.apache.ecs.*;
import org.apache.ecs.html.*;

/** 
 * A servlet to demonstrate the use of the request headers API
 * It also uses ECS to format the results.
 *
 * @version 1.0 2001/08/19 
 * @since 1.0
 * @author Mike Gehard
 */


public class RequestHeaders extends HttpServlet{

	public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException{
		
		response.setContentType("text/html"); 
  		PrintWriter out = response.getWriter(); 
  		
		out.println(createPage(request));
		
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException{
		// forward to doPost()
		doPost(request, response);		
	}
	
	private String createPage(HttpServletRequest request){
		
  		Table table = new Table(0); // border = 0
  		
  		// create the HTML tree
  		Html html = new Html();
  		Head head = new Head();
  		Title title = new Title("Servlet Request Headers");
  		Body body = new Body();
  		
  		body.addElement(new H1("Here are the request headers"));  		
  		head.addElement(title);
  		body.addElement(table);
  		html.addElement(head);
  		html.addElement(body);
  		
  		
  		
  		Enumeration e = request.getHeaderNames();
  		while (e.hasMoreElements()){
  			String name = (String) e.nextElement();
  			String value = request.getHeader(name);
  			
  			TR tr = new TR();
			TD col1 = new TD();
			TD col2 = new TD();
			I it = new I();
			Font font = new Font();
			
			table.addElement(tr);
			
			tr.addElement(col1);
			tr.addElement(col2);
			
			col1.addElement(it);
			it.addElement(font);
			
			font.setColor(HtmlColor.BLUE);
			font.addElement(name);
			
			col2.addElement(value);
		}
  		
    	return html.toString();
		
		
	}

}