session

By: INAYAT HUSSAIN on 07:45

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Servlet using Eclipse and managing session:

The HttpServletRequest interface provides two methods to get the object of HttpSession:

1. public HttpSession getSession()
2. public HttpSession getSession(boolean create)

Commonly used methods of HttpSession interface

1. public String getId():
2. public long getCreationTime():
3. public long getLastAccessedTime()
4. public void invalidate()

example:

file1:index.html

file 2:Login.java(servlet)

package com.session.Demo;

import java.io.IOException;

import java.io.PrintWriter;

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;

@WebServlet("/Login")

public class Login extends HttpServlet {

private static final long serialVersionUID = 1L;

   

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String username=request.getParameter("username");

String password=request.getParameter("password");

if(password.equals("admin")){

HttpSession session=request.getSession(true);

session.setAttribute("uname",username);

//response.sendRedirect("welcome");

PrintWriter out=response.getWriter();

out.println("welcome"+username);

out.println("

>visit your page

");

out.close();

}

else{

PrintWriter out=response.getWriter();

out.println("Sorry invalid username or password");

out.close();

}

}

}

File3:Welcome.java(Servlet)

package com.session.Demo;

import java.io.IOException;

import java.io.PrintWriter;

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;

@WebServlet("/welcome")

public class Welcome extends HttpServlet {

private static final long serialVersionUID = 1L;

   

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

     

// HttpSession session=request.getSession(false);

   // String id= (String) session.getAttribute("uname");

String id=(String) request.getSession().getAttribute("uname");

    

    

    PrintWriter out=response.getWriter();

    out.println("welcome:"+id);

     

}

}