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&lt;%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

&lt;html>
  &lt;head>
    &lt;title>JSP 2.0 Expression Language - Implicit Objects&lt;/title>
  &lt;/head>
  &lt;body>
    &lt;h1>JSP 2.0 Expression Language - Implicit Objects&lt;/h1>
    &lt;hr>
    This example illustrates some of the implicit objects available 
    in the Expression Lanaguage.  The following implicit objects are 
    available (not all illustrated here):
    &lt;ul>
      &lt;li>pageContext - the PageContext object&lt;/li>
      &lt;li>pageScope - a Map that maps page-scoped attribute names to 
          their values&lt;/li>
      &lt;li>requestScope - a Map that maps request-scoped attribute names 
          to their values&lt;/li>
      &lt;li>sessionScope - a Map that maps session-scoped attribute names 
          to their values&lt;/li>
      &lt;li>applicationScope - a Map that maps application-scoped attribute 
          names to their values&lt;/li>
      &lt;li>param - a Map that maps parameter names to a single String 
          parameter value&lt;/li>
      &lt;li>paramValues - a Map that maps parameter names to a String[] of 
          all values for that parameter&lt;/li>
      &lt;li>header - a Map that maps header names to a single String 
          header value&lt;/li>
      &lt;li>headerValues - a Map that maps header names to a String[] of 
          all values for that header&lt;/li>
      &lt;li>initParam - a Map that maps context initialization parameter 
          names to their String parameter value&lt;/li>
      &lt;li>cookie - a Map that maps cookie names to a single Cookie object.&lt;/li>
    &lt;/ul>

    &lt;blockquote>
      &lt;u>&lt;b>Change Parameter&lt;/b>&lt;/u>
      &lt;form action="implicit-objects.jsp" method="GET">
	  foo = &lt;input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
          &lt;input type="submit">
      &lt;/form>
      &lt;br>
      &lt;code>
        &lt;table border="1">
          &lt;thead>
	    &lt;td>&lt;b>EL Expression&lt;/b>&lt;/td>
	    &lt;td>&lt;b>Result&lt;/b>&lt;/td>
	  &lt;/thead>
	  &lt;tr>
	    &lt;td>\${param.foo}&lt;/td>
	    &lt;td>${fn:escapeXml(param["foo"])}&amp;nbsp;&lt;/td>
	  &lt;/tr>
	  &lt;tr>
	    &lt;td>\${param["foo"]}&lt;/td>
	    &lt;td>${fn:escapeXml(param["foo"])}&amp;nbsp;&lt;/td>
	  &lt;/tr>
	  &lt;tr>
	    &lt;td>\${header["host"]}&lt;/td>
	    &lt;td>${fn:escapeXml(header["host"])}&amp;nbsp;&lt;/td>
	  &lt;/tr>
	  &lt;tr>
	    &lt;td>\${header["accept"]}&lt;/td>
	    &lt;td>${fn:escapeXml(header["accept"])}&amp;nbsp;&lt;/td>
	  &lt;/tr>
	  &lt;tr>
	    &lt;td>\${header["user-agent"]}&lt;/td>
	    &lt;td>${fn:escapeXml(header["user-agent"])}&amp;nbsp;&lt;/td>
	  &lt;/tr>
	&lt;/table>
      &lt;/code>
    &lt;/blockquote>
  &lt;/body>
&lt;/html>
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