source: nutchez-0.1/tomcat/webapps/examples/jsp/jsp2/el/implicit-objects.jsp @ 160

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17<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
18
19<html>
20  <head>
21    <title>JSP 2.0 Expression Language - Implicit Objects</title>
22  </head>
23  <body>
24    <h1>JSP 2.0 Expression Language - Implicit Objects</h1>
25    <hr>
26    This example illustrates some of the implicit objects available
27    in the Expression Lanaguage.  The following implicit objects are
28    available (not all illustrated here):
29    <ul>
30      <li>pageContext - the PageContext object</li>
31      <li>pageScope - a Map that maps page-scoped attribute names to
32          their values</li>
33      <li>requestScope - a Map that maps request-scoped attribute names
34          to their values</li>
35      <li>sessionScope - a Map that maps session-scoped attribute names
36          to their values</li>
37      <li>applicationScope - a Map that maps application-scoped attribute
38          names to their values</li>
39      <li>param - a Map that maps parameter names to a single String
40          parameter value</li>
41      <li>paramValues - a Map that maps parameter names to a String[] of
42          all values for that parameter</li>
43      <li>header - a Map that maps header names to a single String
44          header value</li>
45      <li>headerValues - a Map that maps header names to a String[] of
46          all values for that header</li>
47      <li>initParam - a Map that maps context initialization parameter
48          names to their String parameter value</li>
49      <li>cookie - a Map that maps cookie names to a single Cookie object.</li>
50    </ul>
51
52    <blockquote>
53      <u><b>Change Parameter</b></u>
54      <form action="implicit-objects.jsp" method="GET">
55    foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
56          <input type="submit">
57      </form>
58      <br>
59      <code>
60        <table border="1">
61          <thead>
62      <td><b>EL Expression</b></td>
63      <td><b>Result</b></td>
64    </thead>
65    <tr>
66      <td>\${param.foo}</td>
67      <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
68    </tr>
69    <tr>
70      <td>\${param["foo"]}</td>
71      <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
72    </tr>
73    <tr>
74      <td>\${header["host"]}</td>
75      <td>${fn:escapeXml(header["host"])}&nbsp;</td>
76    </tr>
77    <tr>
78      <td>\${header["accept"]}</td>
79      <td>${fn:escapeXml(header["accept"])}&nbsp;</td>
80    </tr>
81    <tr>
82      <td>\${header["user-agent"]}</td>
83      <td>${fn:escapeXml(header["user-agent"])}&nbsp;</td>
84    </tr>
85  </table>
86      </code>
87    </blockquote>
88  </body>
89</html>
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