usejstl.html
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<TITLE>Using the Java Standard Tag Library (JSTL) in a JSP Page
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top"><font face="Times" size="6"><b>The Java Developers Almanac 1.4</b></font>
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<B><A HREF="../javax.servlet.jsp.jstl.core/pkg.html">javax.servlet.jsp.jstl.core</A></B><font color="#666666" SIZE="-2">
[6 examples]
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<h3>
e1063.
Using the Java Standard Tag Library (JSTL) in a JSP Page</h3>
There are four tag libraries that make up the JSTL; see the
<code>javax.servlet.jsp.jstl.*</code> packages for examples that use these tag
libraries. JSTL is not yet a standard part of a JSP container.
Hence, in order to use the JSTL in a web application, you must include
a copy the JSTL library code in the WEB-INF directory of your web
application. These files are available in the Web Services Developer
Pack, which can be download from
<code>http://java.sun.com/webservices/webservicespack.html</code>.
<P> A tag library has two parts - a Tag Library Descriptor (TLD)
file and a JAR file. The following ant elements copy the TLD files
from the Web Services Developer Pack into <code>WEB-INF/tld</code> and the JAR
files into <code>WEB-INF/lib</code>. These elements should be added to the
build target in your build.xml file:
<pre>
<%-- Copy TLD files from WSDP installation --%>
<copy todir="${build}/WEB-INF/tld">
<fileset dir="${jwsdp.home}/tools/jstl/tld">
<include name="*.tld" />
</fileset>
</copy>
<%-- Copy JSTL jar files from WSDP installation --%>
<copy todir="${build}/WEB-INF/lib">
<fileset dir="${jwsdp.home}/tools/jstl">
<include name="jstl.jar" />
</fileset>
<fileset dir="${jwsdp.home}/tools/jstl/standard/lib">
<include name="standard.jar" />
</fileset>
</copy>
</pre>
In order for a JSP page to use the JSTL, it must declare it's
use on the page using the <code>taglib</code> directive. Here's an example
that declares the use of all four JSTL tag libraries:
<pre>
<%-- Core --%>
<%@ taglib uri="/WEB-INF/tld/c-rt.tld" prefix="c_rt" %>
<%-- I18N Formatting --%>
<%@ taglib uri="/WEB-INF/tld/fmt-rt.tld" prefix="fmt_rt" %>
<%-- SQL --%>
<%@ taglib uri="/WEB-INF/tld/sql-rt.tld" prefix="sql_rt" %>
<%-- XML --%>
<%@ taglib uri="/WEB-INF/tld/x-rt.tld" prefix="x_rt" %>
</pre>
The tags in the JSTL core tag library can then be referenced using the
specified prefix as in:
<pre>
<c_rt:if test='<%= request.getParameter("param") != null %>'>
<%= request.getParameter("param") %>
</c_rt:if>
</pre>
See also <a href="../javax.servlet.jsp.jstl.core/uselang.html" class="eglink"><font size="-1"><b>e1064</b> Enabling the JSTL Expression Language in a JSP Page</font></a>.
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Related Examples
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e1064. <a class="eglink" href="uselang.html?l=rel">
Enabling the JSTL Expression Language in a JSP Page
</a>
<br>
e1065. <a class="eglink" href="getparam.html?l=rel">
Getting a Request Parameter Using JSTL in a JSP Page
</a>
<br>
e1066. <a class="eglink" href="attr.html?l=rel">
Saving Data Using JSTL in a JSP Page
</a>
<br>
e1067. <a class="eglink" href="htmlfrag.html?l=rel">
Saving and Emitting HTML Fragments Using JSTL in a JSP Page
</a>
<br>
e1068. <a class="eglink" href="if.html?l=rel">
Conditionally Generating Output Using JSTL in a JSP Page
</a>
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