/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.Enumeration;
import java.net.URL;
import org.xml.sax.*;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
/*
* This sample takes input parameters in the request URL: a URL
* parameter for the XML input, an xslURL parameter for the stylesheet,
* and optional stylesheet parameters.
* To run the equivalent of SimplestXSLServlet (with the documents in the
* servlet document root directory), the request URL is
* http://<server/servletpath>servlet.SimpleXSLServlet?URL=file:todo.xml&xslURL=file:todo.xsl
*
* Using a stylesheet Processing Instruction:
* If the XML document includes a stylesheet PI that you want to use,
* omit the xslURL parameter.
*
* Sending stylesheet parameters:
* If, for example, a servlet takes a stylesheet parameter named param1
* param1 that you want to set to foo, include param1=foo in the URL.
*/
public class XSLTServletWithParams extends HttpServlet {
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// The servlet returns HTML; charset is UTF8.
// See ApplyXSLT.getContentType() to get output properties from <xsl:output>.
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
try
{
TransformerFactory tFactory = TransformerFactory.newInstance();
// Get params from URL.
String xml = getRequestParam(request, "URL");
String xsl = getRequestParam(request, "xslURL");
Source xmlSource = null;
Source xslSource = null;
Transformer transformer = null;
// Get the XML input document.
if (xml != null && xml.length()> 0)
xmlSource = new StreamSource(new URL(xml).openStream());
// Get the stylesheet.
if (xsl != null && xsl.length()> 0)
xslSource = new StreamSource(new URL(xsl).openStream());
if (xmlSource != null) // We have an XML input document.
{
if (xslSource == null) // If no stylesheet, look for PI in XML input document.
{
String media= null , title = null, charset = null;
xslSource = tFactory.getAssociatedStylesheet(xmlSource,media, title, charset);
}
if (xslSource != null) // Now do we have a stylesheet?
{
transformer = tFactory.newTransformer(xslSource);
setParameters(transformer, request); // Set stylesheet params.
// Perform the transformation.
transformer.transform(xmlSource, new StreamResult(out));
}
else
out.write("No Stylesheet!");
}
else
out.write("No XML Input Document!");
}
catch (Exception e)
{
e.printStackTrace(out);
}
out.close();
}
// Get parameters from the request URL.
String getRequestParam(HttpServletRequest request, String param)
{
if (request != null)
{
String paramVal = request.getParameter(param);
return paramVal;
}
return null;
}
// Set stylesheet parameters from the request URL.
void setParameters(Transformer transformer, HttpServletRequest request)
{
Enumeration paramNames = request.getParameterNames();
while (paramNames.hasMoreElements())
{
String paramName = (String) paramNames.nextElement();
try
{
String paramVal = request.getParameter(paramName);
if (paramVal != null)
transformer.setParameter(paramName, paramVal);
}
catch (Exception e)
{
}
}
}
}