Saturday, 21 July 2018

Servlet Program 4 : Servlet Lifecycle with response.sendRedirect()

index.html
<!--
Program to Check the life cycle of servlet through web page creation for a shop
To see the Servlet Life Cycle and go the webpage using response.sendRedirect()
Author  : N.Jayachanrda
-->
<html>
    <head>
        <title>MALAYA STATIONARY SHOP </title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
    </head>
   <h1> Available  Soap Items Are Ponds and Himalaya</h1>
        <div>  </div>
        <form action="ServletLifeCycle" method="post">
            <br>
            Enter your Item Name :  <input type="text" name="itemname"/>
            <input type="submit" value="PRESS TO SEE ITEM DETAILS"/>
        </form>
          
</html>


-----------------------------------------------------------------------------------------------------------------------------

ServletLifeCycle.java

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.*;

/**
 *
 * @Author N.Jayachandra
 */
public class ServletLifeCycle extends HttpServlet {
public ServletLifeCycle()
    {    System.out.println("_________________________________________________");
        System.out.println(" Hai dear students wishs from default constructor");
                                                System.out.println("_________________________________________________");
    }

  public void init(ServletConfig config)

    {
                                             System.out.println();
                                             System.out.println("Servlet Name :"+config.getServletName());
                                             System.out.println();
                                             System.out.println("I am from Init method...!");
                                             System.out.println("__________________________________________________");
                                      
                    }
       
 public void destroy()

    {
                                            System.out.println();
                                            System.out.println("You have pressed shoutdown server so i was destroyed");
                                            System.out.println("______________________________________________________");
                               }
 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            String iname;
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>              Life Cycle of Servelet </title>");           
            out.println("</head>");
           iname=request.getParameter("itemname");
           if (iname.equalsIgnoreCase("ponds"))
                   {
                       out.println("<br>");
                      
                   out.println("the cost of  "+iname+"is :100");
             out.println("<br>");
                        out.println("<a href='index.html'> Go to HOME PAGE</a>");
                                    
                   }
           else
                if (iname.equalsIgnoreCase("Himalaya"))
                   {
                           out.println("<br>");
                      
                       out.println("the cost of  "+iname+" is :150");
             out.println("<br>");
                        out.println("<a href='index.html'> Go to HOME PAGE</a>");
                                    
                   }
                else response.sendRedirect("./EndServlet");
            out.println("</html>");
           
           
        }
    }

   
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   
    @Override
    public String getServletInfo() {
        return "Servelet Life Cycle";
    }

}
______________________________________________________________________________________

EndServlet.java


import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author N.Jayachandra
 */
public class EndServlet extends HttpServlet {
  
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title> Servlet Lifecycle</title>");           
            out.println("</head>");
            out.println("<body>");
             out.println("<br>");
            out.println("<h1> Please Choose the available items in the Shop " + "</h1>");
            out.println("<br>");
            out.println("<a href='index.html'> Go to HOME PAGE</a>");
                                    
            out.println("</body>");
            out.println("</html>");
        }
    }

   
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   
    @Override
    public String getServletInfo() {
        return "GO TO HOME PAGE";
    }

}
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