JSP pageContext implicit Object

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JSP pageContext implicit 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>