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/*
* Copyright 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.StringWriter;
import java.util.Properties;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.MethodInvocationException;
/**
* This class is a simple demonstration of how the Velocity Template Engine
* can be used in a standalone application using the Velocity utility class.
*
* It demonstrates two of the 'helper' methods found in the org.apache.velocity.util.Velocity
* class, mergeTemplate() and evaluate().
*
*
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: Example2.java,v 1.3.14.1 2004/03/04 00:18:29 geirm Exp $
*/
public class Example2
{
public static void main( String args[] )
{
/* first, we init the runtime engine. Defaults are fine. */
try
{
Velocity.init();
}
catch(Exception e)
{
System.out.println("Problem initializing Velocity : " + e );
return;
}
/* lets make a Context and put data into it */
VelocityContext context = new VelocityContext();
context.put("name", "Velocity");
context.put("project", "Jakarta");
/* lets render a template */
StringWriter w = new StringWriter();
try
{
Velocity.mergeTemplate("./src/example2.vm", context, w );
}
catch (Exception e )
{
System.out.println("Problem merging template : " + e );
}
System.out.println(" template : " + w );
/*
* lets dynamically 'create' our template
* and use the evaluate() method to render it
*/
String s = "We are using $project $name to render this.";
w = new StringWriter();
try
{
Velocity.evaluate( context, w, "mystring", s );
}
catch( ParseErrorException pee )
{
/*
* thrown if something is wrong with the
* syntax of our template string
*/
System.out.println("ParseErrorException : " + pee );
}
catch( MethodInvocationException mee )
{
/*
* thrown if a method of a reference
* called by the template
* throws an exception. That won't happen here
* as we aren't calling any methods in this
* example, but we have to catch them anyway
*/
System.out.println("MethodInvocationException : " + mee );
}
catch( Exception e )
{
System.out.println("Exception : " + e );
}
System.out.println(" string : " + w );
}
}
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Hello from $name in the $project project.
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velocity-Velocity-Standalone.zip( 1,876 k)