functions.jsp
上传用户:bj_pst
上传日期:2019-07-07
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文件大小:2k
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- The ASF licenses this file to You under the Apache License, Version 2.0
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- <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
- <%@ taglib prefix="my" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%>
- <html>
- <head>
- <title>JSP 2.0 Expression Language - Functions</title>
- </head>
- <body>
- <h1>JSP 2.0 Expression Language - Functions</h1>
- <hr>
- An upgrade from the JSTL expression language, the JSP 2.0 EL also
- allows for simple function invocation. Functions are defined
- by tag libraries and are implemented by a Java programmer as
- static methods.
- <blockquote>
- <u><b>Change Parameter</b></u>
- <form action="functions.jsp" method="GET">
- foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
- <input type="submit">
- </form>
- <br>
- <code>
- <table border="1">
- <thead>
- <td><b>EL Expression</b></td>
- <td><b>Result</b></td>
- </thead>
- <tr>
- <td>${param["foo"]}</td>
- <td>${fn:escapeXml(param["foo"])} </td>
- </tr>
- <tr>
- <td>${my:reverse(param["foo"])}</td>
- <td>${my:reverse(fn:escapeXml(param["foo"]))} </td>
- </tr>
- <tr>
- <td>${my:reverse(my:reverse(param["foo"]))}</td>
- <td>${my:reverse(my:reverse(fn:escapeXml(param["foo"])))} </td>
- </tr>
- <tr>
- <td>${my:countVowels(param["foo"])}</td>
- <td>${my:countVowels(fn:escapeXml(param["foo"]))} </td>
- </tr>
- </table>
- </code>
- </blockquote>
- </body>
- </html>