| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| 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) |
| { |
| } |
| } |
| } |
| } |