cours0708/P51/apache-tomcat-6.0.14/webapps/examples/jsp/jsp2/el/implicit-objects.jsp.html

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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>
</pre></body></html>