How to compare in hashmap

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Java

JSP

servlet

i have a room booking html form if the room and floor is already booked i need to send it errorpage.jsp , itried this using treemap but i dont know how compare the getparam values and map values please tell the syntax

What I have tried:

package com;

import java.io.File;


import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.TreeMap;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class SelectedRoomServlet
 */
//@WebServlet("/SelectedRoomServlet")
public class SelectedRoomServlet extends HttpServlet {
	
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     *//*
    public SelectedRoomServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	*//**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 *//*
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

	*//**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		String name = request.getParameter("textnames");
		String empid = request.getParameter("empid");
		String emailid = request.getParameter("emailid");
		String project = request.getParameter("project");
		String floor = request.getParameter("floor");
		

		//String  floor = request.getParameter("FLOOR");
		String rooms = request.getParameter("rooms");
		HttpSession sess = request.getSession();
		
		
		sess.setAttribute("name", name);
		
		sess.setAttribute("empid", empid);
		sess.setAttribute("emailid", emailid);
		sess.setAttribute("project", project);
		sess.setAttribute("floor", floor);
		
		sess.setAttribute("rooms", rooms);
		
		
		
      /*//String line = null;
        String ln ="";
       String Str ="E://ConferenceRoomBooking//text.txt";
      File file = new File(Str);
       
        
        FileWriter filewriter = new FileWriter(file,true);
        
        String[] values = ln.split("!");
        for (String str : values) {
			String[] element = str.split(",");
        if(rooms.equals(element[0])&&floor.equals(element[1]))
        {
        	response.sendRedirect("errorpage.jsp");
        }
        
        else
        
        {
        	filewriter.write("name:"+name +"empid:"+empid+"room:"+rooms +"floor:" +floor); 
            if(rooms.equals(rooms)&&floor.equals(floor))
      
       
        response.sendRedirect("Selectedroom.jsp");
        }
        
        filewriter.close();
		*/
		
 
		TreeMap<String, String> map = new TreeMap<String, String>();  
map.put(rooms, floor);
if(map.containsKey(rooms)&&map.containsValue(floor)){

	
	response.sendRedirect("errorpage.jsp");
		
		
	}
else {
	
	response.sendRedirect("Selectedroom.jsp");
	
}
}
}