Velocity 1.7 demo

package com.test;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.Properties;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;

/**
 * <b>Velocity demo</b> <br>
 * (1) You need to download Velocity's jar from <a>http://velocity.apache.org/download.cgi</a><br>
 * (2) This demo just show how to use Velocity base in local path.
 * 
 * @author TianJun
 * @Blog http://tianjun309.iteye.com
 * @Email [email protected]
 * @version 1.0 Aug 14, 2011
 */
public class Test
{
    public static void main(String[] args)
        throws FileNotFoundException, UnsupportedEncodingException
    {
        //(1) init VelocityEngine
        Properties p = new Properties();
        p.setProperty("file.resource.loader.path", Test.getAbsoluteProjectPath() + "/WebRoot/file/");
        VelocityEngine ve = new VelocityEngine();
        ve.init(p);
        
        //(2) set Volocitycontext value 
        VelocityContext context = new VelocityContext();
        context.put("value1", "test_value1");
        context.put("value2", "test_value2");
        PrintWriter writer = new PrintWriter(Test.getAbsoluteProjectPath() + "/WebRoot/file/document2.xml", "utf-8");
        
        //(3) get Template file
        Template t = ve.getTemplate("document.xml");
        
        //(4) merge context with writer
        t.merge(context, writer);
        writer.flush();
        writer.close();
    }
    
    /**
     * project local path
     * 
     * @return project local path
     */
    public static String getAbsoluteProjectPath()
    {
        
        String path = null;
        try
        {
            File file = new File(Thread.currentThread().getContextClassLoader().getResource("").getPath());
            path =
                URLDecoder.decode(file.getAbsolutePath(), "utf-8")
                    .replace("WebRoot\\WEB-INF\\classes", "")
                    .replace("\\", "/");
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }
        return path;
    }
}