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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: XSLTServletWithParams.java 470245 2006-11-02 06:34:33Z minchau $
*/
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 {
/**
* String representing the file separator characters for the System.
*/
public final static String FS = System.getProperty("file.separator");
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 real path for xml and xsl files.
String ctx = getServletContext().getRealPath("") + FS;
// Get the XML input document.
if (xml != null && xml.length()> 0)
xmlSource = new StreamSource(new URL("file", "", ctx + xml).openStream());
// Get the stylesheet.
if (xsl != null && xsl.length()> 0)
xslSource = new StreamSource(new URL("file", "", ctx + 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)
{
}
}
}
}
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