| 1 | <html><body><pre> |
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| 2 | <!-- |
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| 3 | Licensed to the Apache Software Foundation (ASF) under one or more |
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| 4 | contributor license agreements. See the NOTICE file distributed with |
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| 6 | The ASF licenses this file to You under the Apache License, Version 2.0 |
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| 7 | (the "License"); you may not use this file except in compliance with |
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| 8 | the License. You may obtain a copy of the License at |
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| 10 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | |
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| 12 | Unless required by applicable law or agreed to in writing, software |
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| 13 | distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | See the License for the specific language governing permissions and |
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| 17 | --> |
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| 18 | <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> |
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| 19 | |
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| 20 | <html> |
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| 21 | <head> |
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| 22 | <title>JSP 2.0 Expression Language - Implicit Objects</title> |
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| 23 | </head> |
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| 24 | <body> |
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| 25 | <h1>JSP 2.0 Expression Language - Implicit Objects</h1> |
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| 26 | <hr> |
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| 27 | This example illustrates some of the implicit objects available |
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| 28 | in the Expression Lanaguage. The following implicit objects are |
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| 29 | available (not all illustrated here): |
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| 30 | <ul> |
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| 31 | <li>pageContext - the PageContext object</li> |
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| 32 | <li>pageScope - a Map that maps page-scoped attribute names to |
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| 33 | their values</li> |
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| 34 | <li>requestScope - a Map that maps request-scoped attribute names |
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| 35 | to their values</li> |
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| 36 | <li>sessionScope - a Map that maps session-scoped attribute names |
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| 37 | to their values</li> |
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| 38 | <li>applicationScope - a Map that maps application-scoped attribute |
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| 39 | names to their values</li> |
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| 40 | <li>param - a Map that maps parameter names to a single String |
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| 41 | parameter value</li> |
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| 42 | <li>paramValues - a Map that maps parameter names to a String[] of |
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| 43 | all values for that parameter</li> |
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| 44 | <li>header - a Map that maps header names to a single String |
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| 45 | header value</li> |
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| 46 | <li>headerValues - a Map that maps header names to a String[] of |
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| 47 | all values for that header</li> |
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| 48 | <li>initParam - a Map that maps context initialization parameter |
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| 49 | names to their String parameter value</li> |
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| 50 | <li>cookie - a Map that maps cookie names to a single Cookie object.</li> |
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| 51 | </ul> |
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| 52 | |
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| 53 | <blockquote> |
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| 54 | <u><b>Change Parameter</b></u> |
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| 55 | <form action="implicit-objects.jsp" method="GET"> |
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| 56 | foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}"> |
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| 57 | <input type="submit"> |
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| 58 | </form> |
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| 59 | <br> |
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| 60 | <code> |
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| 61 | <table border="1"> |
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| 62 | <thead> |
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| 63 | <td><b>EL Expression</b></td> |
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| 64 | <td><b>Result</b></td> |
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| 65 | </thead> |
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| 66 | <tr> |
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| 67 | <td>\${param.foo}</td> |
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| 68 | <td>${fn:escapeXml(param["foo"])}&nbsp;</td> |
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| 69 | </tr> |
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| 70 | <tr> |
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| 71 | <td>\${param["foo"]}</td> |
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| 72 | <td>${fn:escapeXml(param["foo"])}&nbsp;</td> |
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| 73 | </tr> |
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| 74 | <tr> |
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| 75 | <td>\${header["host"]}</td> |
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| 76 | <td>${fn:escapeXml(header["host"])}&nbsp;</td> |
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| 77 | </tr> |
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| 78 | <tr> |
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| 79 | <td>\${header["accept"]}</td> |
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| 80 | <td>${fn:escapeXml(header["accept"])}&nbsp;</td> |
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| 81 | </tr> |
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| 82 | <tr> |
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| 83 | <td>\${header["user-agent"]}</td> |
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| 84 | <td>${fn:escapeXml(header["user-agent"])}&nbsp;</td> |
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| 85 | </tr> |
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| 86 | </table> |
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| 87 | </code> |
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| 88 | </blockquote> |
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| 89 | </body> |
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| 90 | </html> |
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| 91 | </pre></body></html> |
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