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20.7 Hello XML
The JSP 2.0 example (Example 20-5) looks much cleaner
than the original JSP code of Example 20-4. Because
of its <%@page...%> and
<%@taglib...%> directives, however, it is
not a valid XML document. JSP 2.0 pages can
also be written as valid XML documents using a slightly different
format illustrated in Example 20-6.
hello3.jspx (note the file extension) is a rewrite
of Example 20-5 using the XML format. It is a valid
XML file that, when accessed, outputs a valid XHTML document. It uses
the <jsp:directive.page> tag instead of the
@page directive, and it uses a custom
<tags:xhtml> tag to output an appropriate
XHTML DOCTYPE declaration and <html> tag.
The definition of this custom <tags:xhtml>
tag is in the WEB-INF/tags/ directory of the WAR
file, and is not shown here. We'll see more about
JSP 2 custom tags later in this chapter.
Example 20-6. hello3.jspx
<?xml version="1.0"?>
<tags:xhtml xmlns:tags="urn:jsptagdir:/WEB-INF/tags"
xmlns:jsp="http://java.sun.com/JSP/Page"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns="http://www.w3.org/1999/xhtml">
<jsp:directive.page contentType='text/html'/>
<head><title>Hello</title></head>
<body>
<c:choose>
<c:when test='${param.name == null}'>
<form action="hello3.jspx">
<p>Please enter your name:
<input name="name"/>
<input type="submit"/>
</p></form>
</c:when>
<c:otherwise>
<p>Hello ${param.name}!</p>
</c:otherwise>
</c:choose>
</body>
</tags:xhtml>
