In this project we:
1)check whether the session already existed or was just created. (MySession.java)
2)ask for ONLY a pre-existing session. (MySessionChk.java)
To run this project we need following files:
1)web.xml
2)index.jsp
3)MySession.java
4)MySessionChk.java
1)check whether the session already existed or was just created. (MySession.java)
2)ask for ONLY a pre-existing session. (MySessionChk.java)
To run this project we need following files:
1)web.xml
2)index.jsp
3)MySession.java
4)MySessionChk.java
1)web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>Session Ex1</servlet-name>
<servlet-class>com.jexamples.web.MySession</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Session Ex1</servlet-name>
<url-pattern>/SessionTest.do</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>Session Ex2</servlet-name>
<servlet-class>com.jexamples.web.MySessionChk</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Session Ex2</servlet-name>
<url-pattern>/SessionTestChk.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
2)index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body bgcolor="skyblue">
<h3> <a href="SessionTest.do"> click to check whether the session already existed or was just created </a></h3>
<h3> <a href="SessionTestChk.do"> click here if you want ONLY a pre-existing session </a></h3>
</body>
</html>
3)MySession.java
package com.jexamples.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class MySession extends HttpServlet
{
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<body bgcolor='blue'><h1> WELCOME!!!!<h1> ");
HttpSession session = request.getSession();
String sId;
if(session.isNew())
{
sId = session.getId();
out.println("<h2>Session Id is = "+sId+"</h2>");
out.println("<h2> This is a new session </h2>");
}
else
{
sId = session.getId();
out.println("<h2>Session Id is = "+sId+"</h2>");
out.println("<h2>Welcome back</h2>");
}
out.println("</body>");
}
}
4)MySessionChk.java
package com.jexamples.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class MySessionChk extends HttpServlet
{
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<body bgcolor='blue'><h1> WELCOME!!!!<h1> ");
HttpSession session = request.getSession(false);
String sId;
if(session==null)
{
out.println("<h2> No session was available</h2>");
out.println("<h2> making new one .. </h2>");
session = request.getSession();
sId = session.getId();
out.println("<h2>Session Id is = "+sId+"</h2>");
}
else
{ out.println("<h2>There was a session</h2>");
sId = session.getId();
out.println("<h2>Session Id is = "+sId+"</h2>");
out.println("<h2>Welcome back</h2>");
}
out.println("</body>");
}
}
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