JSP pageContext implicit object

JSP pageContext object is an instance of javax.servlet.jsp.PageContext. This object is used to manipulate page, request, application and session attributes.

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

home.jsp

<html>
	<head>
		<title>home</title>
	</head>
	<body> 
	<h3>This is user home page.</h3>
	<%
	String userName = (String)pageContext.getAttribute("userName",
                                               PageContext.SESSION_SCOPE);
	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 24 login

Enter UserName: jai
jsp example 24 value

Click on login button.
jsp example 24 display

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