JSP session implicit object

JSP session object is an instance of javax.servlet.http.HttpSession. This object is used to for session tracking or session management.

Example:

login.jsp

<html>
	<head>
		<title>login</title>
	</head>
	<body> 
		<form action="welcome.jsp">
			<input type="text" name="userName" />
			<input type="submit" value="login"/>
		</form>
	</body>
</html>

welcome.jsp

<html>
	<head>
		<title>session implicit object example</title>
	</head>
	<body> 
		<%
			String userName=request.getParameter("userName");
			if(userName.equals("jai")){
			     session.setAttribute("userName", userName);
			     response.sendRedirect("home.jsp");  
			}else{
			     out.print("Wrong username.");  
			}
		%>
	</body>
</html>

home.jsp

<html>
	<head>
		<title>home</title>
	</head>
	<body> 
		<h3>This is user's home page.</h3>
		<%
		   String userName = 
                          (String)session.getAttribute("userName");
		   out.print("Logged in user: " + userName);
		%>
	</body>
</html>

web.xml

<web-app>
 
  <welcome-file-list>
          <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>	
 
</web-app>

Output:

jsp example 23 login

Enter UserName: jai
jsp example 23 value

Click on login button.
jsp example 23 display

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