JavaServer Pages, 3rd Edition

Transforming XML into a Device-Dependent Format

A web application can use XSLT to respond with different content depending on the type of device making the request. Example 15-4 shows a page that serves both HTML and WML browsers by applying different stylesheets to the same XML document, transforming it to the appropriate markup for the browser that requests it.

Example 15-4. XSL stylesheet that generates HTML or WML (phone.jsp)

                  <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" 
%><%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" 
%><%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" 
%><%@ taglib prefix="ora" uri="orataglib" 
%><c:choose><c:when 
test="${fn:contains(header.Accept, 'text/vnd.wap.wml'}"
><ora:setHeader name="Content-Type" value="text/vnd.wap.wml" 
/><c:import url="wml.xsl" var="stylesheet" 
/></c:when><c:otherwise><ora:setHeader name="Content-Type" value="text/html"
/><c:import url="html.xsl" var="stylesheet" 
/></c:otherwise></c:choose><x:transform xslt="${stylesheet}">
  <?xml version="1.0" encoding="ISO-8859-1"?>
  <employees>
    <employee id="123">
      <first-name>Hans</first-name>
      <last-name>Bergsten</last-name>
      <telephone>310-555-1212</telephone>
    </employee>
    <employee id="456">
      <first-name>Bob</first-name>
      <last-name>Eckstein</last-name>
      <telephone>800-555-5678</telephone>
    </employee>
    <employee id="789">
      <first-name>Paula</first-name>
      <last-name>Ferguson</last-name>
      <telephone>213-555-1234</telephone>
    </employee>
  </employees>
</x:transform> ...