util class for use velocity in Google App Engine/Java

VelocityUtils.java

import java.io.StringWriter;
import java.util.Map;

import javax.servlet.ServletContext;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;

/**
 * create velocity dir in war directory.
 * 
 * 
 * sample code
 * this sample you need create a file which contain text "$title" at velocity/hello.html
 * 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 StringBuffer output=new StringBuffer();
  	
		Map<String,String> hashMap=new HashMap<String, String>();
		hashMap.put("title", "this is test");
		
		String html=VelocityUtils.createVelocityPage(getServletContext(), "hello.html", hashMap);
		output.append(html);
		
		//print out
		response.setContentType("text/html;charset=UTF-8");
		response.getWriter().write(output.toString());
		}
		
 * @author aki
 *
 */
public class VelocityUtils {
	public static String baseVelocityDir="velocity";

	@SuppressWarnings("rawtypes")
	public static String createVelocityPage(ServletContext scontext,String realPath,Map map){
		VelocityContext context= new VelocityContext(map);
		return createVelocityPage(scontext, realPath, context);
	}
		
	public static String createVelocityPage(ServletContext scontext,String realPath,VelocityContext context){
		
		Velocity.setProperty(VelocityEngine.RUNTIME_LOG_LOGSYSTEM_CLASS, "org.apache.velocity.runtime.log.NullLogSystem");
		setVelociyLoaderPath(scontext);
		try {
			Velocity.init();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		try{
		StringWriter writer=new StringWriter();
		Template template = Velocity.getTemplate(realPath, "UTF-8");
		template.merge(context,writer);
		
		return writer.toString();
		} catch (ResourceNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ParseErrorException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

private static void setVelociyLoaderPath(ServletContext scontext){
	String dir=scontext.getRealPath(baseVelocityDir);
	Velocity.setProperty("file.resource.loader.path",dir );
}

public static VelocityContext createVelocityContext() {
	VelocityContext context= new VelocityContext();
	return context;
}

}