Core JSTL: Mastering the JSP™ Standard Tag Library
Page15
<phone type="work">716-873-9644</phone>
<phone type="home">716-834-8772</phone>
</contact>
...
</rolodex>
The preceding XML document is a Rolodex that keeps track of a collection of contacts. For brevity, only the first
entry in the Rolodex is listed above. The code fragment listed below parses that document and creates an HTML
table that shows the data associated with each entry in the address book:
[10]
[10]
See " Parsing XML " on page 432 for more information about that code.
<c:import var='rolodex_xml' url='rolodex.xml'/>
<x:parse var='document' xml='${rolodex_xml}'/>
<table>
<x:forEach select='$document//contact'>
<table>
<tr><td>First Name:</td>
<td><x:out select='firstName'/></td></tr>
<tr><td>Last Name:</td>
<td><x:out select='lastName'/></td></tr>
<tr><td>Email:</td>
<td><x:out select='email'/></td></tr>
<tr><td>Work Phone:</td>
<td><x:out select='phone[@type="work"]'/></td></tr>
<x:if select='phone[@type="home"]'>
<tr><td>Home Phone:</td>
<td><x:out select='phone[@type="home"]'/></td>
</x:if>
</table><br>
</x:forEach>
</table>
The preceding code fragment uses the <x:parse> action to parse the Rolodex XML document. Subsequently, it
uses the <x:forEach>, <x:out>, and <x:if> actions to show the contacts in an HTML table; that output looks like
this:
First Name: Anna
Last Name: Keeney
Email: anna.keeney@worldlink.net
Work Phone: 716-873-9644
Home Phone: 716-834-8772
...
The JSTL Tag Library Validators
JSTL lets you eliminate almost all JSP scriptlets and expressions from your JSP code, which makes your code
more maintainable and extensible. It will take some discipline on your part, however, to keep scriptlets and
expressions out of your code; occasionally, you might have to implement a servlet or custom action to assist you in
that endeavor.
Instead of relying on discipline to keep JSP scriptlets and expressions out of your code, you can use one of the
JSTL tag library validators to enforce that restriction. That validator lets you allow or disallow the following:
• JSP declarations
• JSP expressions
• JSP scriptlets
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