navigation.java

airline reservation system is a simple jsp application through which users can reserve tickets onlin

/*
 * Navigation.java
 *
 * Created on August 2, 2007, 10:23 AM
 */

package com.foreapps.navigation;


import com.foreapps.common.InputManager;
import com.foreapps.common.OutputManager;
import com.foreapps.common.PropertyReader;

import java.io.*;
import java.util.Enumeration;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author Sailen 
 * @version
 */
public class Navigation extends HttpServlet {
    
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * Creates an Instance of Input Manager (contains all the input Parameter)
     * Get the Required Implementation class for the Command 
     * Call tHe execute Method of The class which return instance of OutputManager
     * Call the Required View(jsp/html)
     */
    
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
          
         
       System.out.println("Navigate to the request");
        PropertyReader pr=new PropertyReader("com.foreapps.navigation.Navigation");
        Enumeration param=request.getParameterNames();
        while(param.hasMoreElements()){
        String paramName=   param.nextElement().toString();  
         PrintWriter pw2=response.getWriter();  
         
        if(paramName.contains("ACTION.")){
            
            String commandName=pr.getString(paramName);
            
            try{
            if(!commandName.equalsIgnoreCase("NAVIGATION")){    
         InputManager objInp= new InputManager(request);    
         
         Class objCls=Class.forName(commandName);
          
         NavigationCommand navCmd=( NavigationCommand)objCls.newInstance();
          
           
        OutputManager objOut= navCmd.execute(objInp);
        
        request.setAttribute("RESULT",objOut.getVcRes());
         
         this.getServletContext().getRequestDispatcher(pr.getString(paramName+"."+objOut.getStrNavUrl().toUpperCase())).forward(request,response);
         }else{
         this.getServletContext().getRequestDispatcher(pr.getString(paramName+".SUCCESS")).forward(request,response);
         }
            
            
            }
            catch(Exception e){
                PrintWriter pw=response.getWriter();
                pw.print("hi"+e.getMessage());
            }
            
        }
           
        }
     
    }
    
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}