jstrachan 2002/12/09 07:18:26
Modified: jelly project.xml
Added: jelly/src/java/org/apache/commons/jelly/servlet
JellyServlet.java
Log:
Applied patch supplied by Kelvin Tan to provide a Servlet for evaluating Jelly
scripts inside a servlet engine.
Revision Changes Path
1.1
jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/servlet/JellyServlet.java
Index: JellyServlet.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/servlet/JellyServlet.java,v
1.1 2002/12/09 15:18:26 jstrachan Exp $
* $Revision: 1.1 $
* $Date: 2002/12/09 15:18:26 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 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 acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", 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 [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 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. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: JellyServlet.java,v 1.1 2002/12/09 15:18:26 jstrachan Exp $
*/
package org.apache.commons.jelly.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.XMLOutput;
/**
* Servlet for handling display of Jelly-fied XML files. Modelled after
VelocityServlet.
*
* @author Kelvin Tan
* @version $Revision: 1.1 $
*/
public class JellyServlet extends HttpServlet {
/**
* The HTTP request object context key.
*/
public static final String REQUEST = "request";
/**
* The HTTP response object context key.
*/
public static final String RESPONSE = "response";
protected void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doRequest(request, response);
}
protected void doPost(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doRequest(request, response);
}
/**
* Handles all requests
* @param req HttpServletRequest object containing client request
* @param res HttpServletResponse object for the response
* @throws ServletException
* @throws IOException
*/
protected void doRequest(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
JellyContext context = createContext(req, res);
URL template = getTemplate(req);
try {
runScript(template, context, req, res);
}
catch (Exception e) {
error(req, res, e);
}
}
/**
* @see org.apache.velocity.servlet.VelocityServlet#createContext
* @param req
* @param res
* @return
*/
protected JellyContext createContext(
HttpServletRequest req,
HttpServletResponse res) {
JellyContext ctx = new JellyContext();
ctx.setVariable(REQUEST, req);
ctx.setVariable(RESPONSE, res);
return ctx;
}
/**
* @see org.apache.velocity.servlet.VelocityServlet#getTemplate
* @param req
* @return
* @throws MalformedURLException
*/
protected URL getTemplate(HttpServletRequest req)
throws MalformedURLException {
String script = req.getParameter("template");
if (script == null) {
script = req.getServletPath();
}
return getServletContext().getResource(script);
}
/**
* @see org.apache.velocity.servlet.VelocityServlet#mergeTemplate
* @param script
* @param context
* @param req
* @param res
* @throws IOException
* @throws UnsupportedEncodingException
* @throws Exception
*/
protected void runScript(
URL script,
JellyContext context,
HttpServletRequest req,
HttpServletResponse res)
throws IOException, UnsupportedEncodingException, Exception {
ServletOutputStream output = res.getOutputStream();
XMLOutput xmlOutput = XMLOutput.createXMLOutput(output);
context.runScript(script, xmlOutput);
xmlOutput.flush();
xmlOutput.close();
output.flush();
}
/**
* Invoked when there is an error thrown in any part of doRequest() processing.
* <br><br>
* Default will send a simple HTML response indicating there was a problem.
*<br><br>
* Ripped from VelocityServlet.
*
* @param request original HttpServletRequest from servlet container.
* @param response HttpServletResponse object from servlet container.
* @param cause Exception that was thrown by some other part of process.
*/
protected void error(
HttpServletRequest request,
HttpServletResponse response,
Exception cause)
throws ServletException, IOException {
StringBuffer html = new StringBuffer();
html.append("<html>");
html.append("<title>Error</title>");
html.append("<body bgcolor=\"#ffffff\">");
html.append("<h2>JellyServlet : Error processing the template</h2>");
html.append("<pre>");
String why = cause.getMessage();
if (why != null && why.trim().length() > 0) {
html.append(why);
html.append("<br>");
}
StringWriter sw = new StringWriter();
cause.printStackTrace(new PrintWriter(sw));
html.append(sw.toString());
html.append("</pre>");
html.append("</body>");
html.append("</html>");
response.getOutputStream().print(html.toString());
}
}
1.97 +8 -0 jakarta-commons-sandbox/jelly/project.xml
Index: project.xml
===================================================================
RCS file: /home/cvs/jakarta-commons-sandbox/jelly/project.xml,v
retrieving revision 1.96
retrieving revision 1.97
diff -u -r1.96 -r1.97
--- project.xml 6 Dec 2002 14:54:04 -0000 1.96
+++ project.xml 9 Dec 2002 15:18:26 -0000 1.97
@@ -207,6 +207,14 @@
<role>Developer</role>
</roles>
</contributor>
+ <contributor>
+ <name>Kelvin Tan</name>
+ <email></email>
+ <organization></organization>
+ <roles>
+ <role>Developer</role>
+ </roles>
+ </contributor>
</contributors>
<dependencies>
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