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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: TransformServlet.java 470245 2006-11-02 06:34:33Z minchau $
*/
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.xml.sax.SAXException;
/**
* This servlet demonstrates how XSL transformations can be made available as
* a web service. See the CompileServlet for an example on how stylesheets
* can be pre-compiled before this servlet is invoked.
*
* Note that the XSLTC transformation engine is invoked through the JAXP
* interface, using the XSLTC "use-classpath" attribute. The
* "use-classpath" attribute specifies to the XSLTC TransformerFactory
* that a precompiled version of the stylesheet (translet) may be available,
* and that that should be used in preference to recompiling the stylesheet.
* @author Morten Jorgensen
* @author Jacek Ambroziak
*/
public final class TransformServlet extends HttpServlet {
/**
* Main servlet entry point
*/
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// Initialise the output writer
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Get the two paramters "class" and "source".
String transletName = request.getParameter("class");
String documentURI = request.getParameter("source");
try {
if ((transletName == null) || (documentURI == null)) {
out.println("<h1>XSL transformation error</h1>");
out.println("The parameters <b><tt>class</tt></b> and " +
"<b><tt>source</tt></b> must be specified");
}
else {
TransformerFactory tf = TransformerFactory.newInstance();
try {
tf.setAttribute("use-classpath", Boolean.TRUE);
} catch (IllegalArgumentException iae) {
System.err.println(
"Could not set XSLTC-specific TransformerFactory "
+ "attributes. Transformation failed.");
}
Transformer t =
tf.newTransformer(new StreamSource(transletName));
// Start the transformation
final long start = System.currentTimeMillis();
t.transform(new StreamSource(documentURI),
new StreamResult(out));
final long done = System.currentTimeMillis() - start;
out.println("<!-- transformed by XSLTC in "+done+"msecs -->");
}
}
catch (Exception e) {
out.println("<h1>Error</h1>");
out.println(e.toString());
}
}
}
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