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<document><header><product>resin</product><version>Resin 3.0</version><type>tutorial</type><title>Tag Files</title><description><p>JSP 2.0 introduces XML-based tag files. Instead of having to writeJava code for custom tags, applications can use XML or JSP syntax fortheir tags. Tag files do not require .tld files,making development simpler.</p></description><tutorial-startpage>test.jsp</tutorial-startpage></header><body><summary/><s1 title="Files in this tutorial"><deftable><tr><td><viewfile-link file="test.jsp"/> </td><td>The jsp page that uses the tags</td></tr><tr><td><viewfile-link file="WEB-INF/tags/test.tagx"/> </td><td>The basic tag.</td></tr></deftable></s1><s1 title="The tag file"><p>Tag files in JSP 2.0 look and run like normal JSP files with some extradirectives. This example definine a tag attribute "a" whichtakes a <code>String</code> value. It prints a simple message.</p><example title="WEB-INF/tags/test.tagx"><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"> <jsp:directive.attribute name="a" type="java.lang.String" required="true"/> <jsp:text>A sample tag: ${'${'}a}</jsp:text></jsp:root></example><p>The <var>.tagx</var> extension identifies the tag as a JSP tag fileusing XML syntax. The example could also have used <var>test.tag</var> fora tag file in JSP syntax. Tag files normally belong in WEB-INF/tags,although the location is configurable.</p><p>The tag example uses the JSP 2.0 Expression Language as an example andas a way to avoid any Java in the tag file. The <code>${"${"}a}</code>tells the tag to look in the <code>pageContext</code> for a localvariable <code>a</code>. The value of <code>a</code> is assigned bythe tag attribute as defined in the attribute directive.</p></s1><s1 title="Using the tag file"><p>Using tag files is similar to using normal JSP tags. This exampleuses the XML syntax, although normal JSP syntax would work, too.The namespace prefix <var>urn:tagfiledir:</var> tells JSP where to lookfor the tag. In this case it will look in WEB-INF/tags.</p><example title="test.jsp"><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:tags="urn:jsptagdir:/WEB-INF/tags"> <tags:test a="Test 1"/><br/> <tags:test a="Test 2"/></jsp:root></example><results>A sample tag: Test 1<br>A sample tag: Test 2</results></s1></body></document>⌨️ 快捷键说明
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