<div dir="ltr" style="text-align: left;" trbidi="on">
<div dir="ltr" style="text-align: left;" trbidi="on">JSP <i><b>pageContext </b></i>Object is implicitly available to the developer on Java Server Pages. A <b><i>pageContext</i></b> implicit object is used for storing and retrieving page-related information and sharing objects within the same translation unit and same request. Also used as a convenience class that maintains a table of all the other implicit objects.</p>
<p> <b>It stores referece to the implicit objects-</b><br />
The following example shows how <i><b>PageContext </b></i>is used to populate other implicit objects.</p>
<pre class="highlight" name="code">public void _jspService (HttpServletRequest request, HttpServletResponse response)
 throws java.io.IOException, ServletException { 

 ... 
 try { 

 ... 
 application = pageContext.getServletContext ();
 config = pageContext.getServletConfig ();
 session = pageContext.getSession ();
 out = pageContext.getOut (); 
 ... 

 } catch (Throwable t) {
 ... 
 } finally {
 ... 
 }
}
</pre>
<p>
<b>Provides convenience methods to get and set attributes in different scopes-</b><br />
This example uses attributes to save and retrieve data in each of the four scopes:</p>
<pre class="highlight" name="code"><;%
 // Save data
 pageContext.setAttribute("attr1", "value0"); // PAGE_SCOPE is the default
 pageContext.setAttribute("attr2", "value1", PageContext.PAGE_SCOPE);
 pageContext.setAttribute("attr3", "value2", PageContext.REQUEST_SCOPE);
 pageContext.setAttribute("attr4", "value3", PageContext.SESSION_SCOPE);
 pageContext.setAttribute("attr5", "value4", PageContext.APPLICATION_SCOPE);
%>;
 
<;%-- Show the values --%>;
<;%= pageContext.getAttribute("attr1") %>;
<;%= pageContext.getAttribute("attr2", PageContext.PAGE_SCOPE) %>;
<;%= pageContext.getAttribute("attr3", PageContext.REQUEST_SCOPE) %>;
<;%= pageContext.getAttribute("attr4", PageContext.SESSION_SCOPE) %>;
<;%= pageContext.getAttribute("attr5", PageContext.APPLICATION_SCOPE) %>;
</pre>
<p>
<b>JSP <i>pageContext </i>Object Example:</b></p>
<pre class="highlight" name="code"><;%@ 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>;
<;title>;JSP pageContext Object Example<;/title>;
<;/head>;
<;body>;
<;% 
 JspWriter pw = pageContext.getOut();
 pw.print("Hello Dinesh....This is another example of JSP 'pageContext' object");
%>;
<;/body>;
<;/html>;
</pre>
<p>As you can see above, using JSP <b><i>pageContext </i></b>object, <i><b>JspWriter </b></i>instance is created. Using this <i><b>JspWriter</b></i> object, String response is set that displayed on the browser when JSP served a request.</div>
<p></p>
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