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/*
* Copyright 2000-2001,2004 The Apache Software Foundation.
*
* Licensed 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.
*/
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.Properties;
import java.util.Vector;
import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.velocity.Template;
import org.apache.velocity.context.Context;
import org.apache.velocity.servlet.VelocityServlet;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.exception.ParseErrorException;
/**
* Sample of how to use the VelocityServlet.
* This example shows how to add objects to the context and
* pass them to the template.
*
* @author Dave Bryson
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: SampleServlet.java,v 1.5.8.1 2004/03/04 00:18:29 geirm Exp $
*/
public class SampleServlet extends VelocityServlet
{
/**
* Called by the VelocityServlet
* init(). We want to set a set of properties
* so that templates will be found in the webapp
* root. This makes this easier to work with as
* an example, so a new user doesn't have to worry
* about config issues when first figuring things
* out
*/
protected Properties loadConfiguration(ServletConfig config )
throws IOException, FileNotFoundException
{
Properties p = new Properties();
/*
* first, we set the template path for the
* FileResourceLoader to the root of the
* webapp. This probably won't work under
* in a WAR under WebLogic, but should
* under tomcat :)
*/
String path = config.getServletContext().getRealPath("/");
if (path == null)
{
System.out.println(" SampleServlet.loadConfiguration() : unable to "
+ "get the current webapp root. Using '/'. Please fix.");
path = "/";
}
p.setProperty( Velocity.FILE_RESOURCE_LOADER_PATH, path );
/**
* and the same for the log file
*/
p.setProperty( "runtime.log", path + "velocity.log" );
return p;
}
/**
* <p>
* main routine to handle a request. Called by
* VelocityServlet, your responsibility as programmer
* is to simply return a valid Template
* </p>
*
* @param ctx a Velocity Context object to be filled with
* data. Will be used for rendering this
* template
* @return Template to be used for request
*/
public Template handleRequest( HttpServletRequest request,
HttpServletResponse response, Context ctx )
{
/*
* set up some data to put into the context
*/
String p1 = "Bob";
String p2 = "Harold";
Vector personList = new Vector();
personList.addElement( p1 );
personList.addElement( p2 );
/*
* Add the list to the context.
* This is how it's passed to the template.
*/
ctx.put("theList", personList );
/*
* get the template. There are three possible
* exceptions. Good to know what happened.
*/
Template outty = null;
try
{
outty = getTemplate("sample.vm");
}
catch( ParseErrorException pee )
{
System.out.println("SampleServlet : parse error for template " + pee);
}
catch( ResourceNotFoundException rnfe )
{
System.out.println("SampleServlet : template not found " + rnfe);
}
catch( Exception e )
{
System.out.println("Error " + e);
}
return outty;
}
}
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