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A simple application demonstrating Request, Session, Context differences and usages in JSP and Servlets


A simple application demonstrating Request, Session, Context differences and usages in JSP and Servlets

Create a CSS file by name style.css :

body {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 background-color: #FDF4DF;
 font-size: 12px;
 color: #000080;
}

td {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 font-size: 14px;
 font-weight: bold;
}

tr {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 font-size: 14px;
}

.black {
 color: blue;
 font-weight: bold;
 font-size: 16px;
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
}



Create a JSP file by name scope.jsp :


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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Scope testing in JSP</title>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>

 <%
  String name = request.getParameter("name");
  session = request.getSession();
  ServletContext context = request.getServletContext();
  if (name != "" && name != null) {
   session.setAttribute("name", name);
   context.setAttribute("name", name);
  }

  String sessionName = (String) session.getAttribute("name");
  String contextName = (String) context.getAttribute("name");
 %>
 <hr></hr>
 <h2>Request , Session and Context Scope Usage :</h2>

 <hr>
 <br />
 <table cellspacing="0" cellpadding="5" border="1">
  <tr>
   <td class="black" bgcolor="#FFFFFF">Scope</td>
   <td class="black" bgcolor="#FFFFFF">Parameter</td>
   <td class="black" bgcolor="#FFFFFF">Value</td>
  </tr>
  <tr>
   <td>Request</td>
   <td>name</td>
   <td><%=name%></td>
  </tr>
  <tr>
   <td>Session</td>
   <td>name</td>
   <td><%=sessionName%></td>
  </tr>
  <tr>
   <td>Context</td>
   <td>name</td>
   <td><%=contextName%></td>
  </tr>
 </table>
 <br />
 <hr>


</body>
</html>


Running the steps below in order (mandatory) :

Step 1 : Opening scope.jsp in Mozilla Firefox with url as "http://localhost:8080/Scopes/scope.jsp?name=Jonty"

Output at the browser :
























Step 2 : Opening scope.jsp in Mozilla Firefox's New Tab with url as "http://localhost:8080/Scopes/scope.jsp

Output at the browser :

























Step 3 : Opening scope.jsp in Mozilla Firefox New Window  with url as "http://localhost:8080/Scopes/scope.jsp

Output at the browser :

























Step 4 : Opening scope.jsp in Internet Explorer  with url as "http://localhost:8080/Scopes/scope.jsp

Output at the browser : 


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