getparam.html

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<TITLE>Getting a Request Parameter Using JSTL in a JSP Page
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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  <h3>
    e1065.  
    Getting a Request Parameter Using JSTL in a JSP Page</h3>

When using the JSTL's expression language (see
<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>), the request parameters
are made available in the implicit object <code>param</code>.  This example
demonstrates how to include the value of a request parameter from the
query string or posted data in the generated output:


<pre>
    &lt;%-- Declare the core library --%&gt;
    &lt;%@ taglib uri="/WEB-INF/tld/c.tld" prefix="c" %&gt;
    
    &lt;c:choose&gt;
        &lt;c:when test="${empty param.name}"&gt;
            Please enter your name.
        &lt;/c:when&gt;
        &lt;c:otherwise&gt;
            Hello &lt;b&gt;&lt;c:out value="${param.name}" /&gt;&lt;/b&gt;!
        &lt;/c:otherwise&gt;
    &lt;/c:choose&gt;
</pre>
If the page was accessed with the URL:

<pre>
    http://hostname.com/mywebapp/mypage.jsp?name=John+Smith
</pre>
the resulting output would be:

<pre>
    Hello &lt;b&gt;John Smith&lt;/b&gt;!
</pre>
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            &nbsp;Related Examples
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e1063. <a class="eglink" href="usejstl.html?l=rel">
    Using the Java Standard Tag Library (JSTL) in a JSP Page
</a>
<br>

e1064. <a class="eglink" href="uselang.html?l=rel">
    Enabling the JSTL Expression Language 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>
<br>


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