Problem using RequestDispatcher

Greenhorn

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posted 4 years ago

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I'm Logging in by username="Teja" and password ="Teja123" and when i click on login, LoginServlet gets executed.
LoginServlet is dispatching the request to home.jsp. So, in home.jsp when i click on 'profile' ProfileServlet gets executed. From profile if I wanted to go back to previous page i'm getting a page saying "RESUBMIT THE FORM ? ".
If i'm using response.sendRedirect("home.jsp") in LoginServlet there is no "RESUBMIT THE FORM ? " page but goes back to home.jsp page

login.html

LoginServlet

package com.teja.programs;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter pw = response.getWriter();
		String username = request.getParameter("uname");
		String password = request.getParameter("upwd");
		if(username.equals("Teja") && password.equals("Teja123")) {
			HttpSession session = request.getSession();
			session.setAttribute("username",username );
			request.getRequestDispatcher("home.jsp").forward(request, response); // response.sendRedirect("home..jsp");
		}
		else {
			pw.println("Invalid Username or Password");
			request.getRequestDispatcher("login.html").include(request, response); 
		}
	}

}

home.jsp

LogoutServlet

ProfileServlet

package com.teja.programs;

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.http.HttpSession;

public class ProfileServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter pw = response.getWriter();
		response.setHeader("Cache-Control","no-cache,no-store,must-revalidate");
		HttpSession session = request.getSession();
		if(session.getAttribute("username")!=null) {
			request.getRequestDispatcher("link2.html").include(request, response);
			String username = (String)session.getAttribute("username");
			pw.println("Hello "+username+" Welcome to profile");
		}
		else {
			pw.println("Login First");
			request.getRequestDispatcher("login.html").include(request,response);
		}
	}

}

link.html

link2.html

Bear Bibeault

Sheriff