BE THE CODER > Template Engines > Velocity Examples

Apache Velocity is a free, simple and powerful template engine written in 100% pure Java. This requires the libraries velocity-1.7.jar, oro-2.0.8.jar, commons-lang-2.4.jar, commons-collections-3.2.1.jar, commons-logging-1.1.jar, log4j-1.2.12.jar to be in classpath. The following example shows invoking static and instance methods in Velocity.

File Name :

/VELOCITY001/config/methods.vm

File Name :

com/bethecoder/tutorials/velocity/common/MethodBean.java


package com.bethecoder.tutorials.velocity.common;



public class MethodBean {



  public String toUpperCase(String str) {

    return str.toUpperCase();

  }

  

  public double pow(double a, double b) {

    return Math.pow(a, b);

  }

}

File Name :	com/bethecoder/tutorials/velocity/tests/MethodsTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.velocity.tests;



import java.io.StringWriter;



import org.apache.velocity.Template;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.VelocityEngine;

import org.apache.velocity.runtime.RuntimeConstants;

import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;



import com.bethecoder.tutorials.velocity.common.MethodBean;



public class MethodsTest {



  /**

   * @param args

   */

  public static void main(String[] args)  {



    /**

     * Initialize engine and get template

     */

    VelocityEngine ve = new VelocityEngine();

    ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath"); 

    ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());

        Template template = ve.getTemplate("methods.vm");

        

        /**

         * Prepare context data

         */

        VelocityContext context = new VelocityContext();

        context.put("bean", new MethodBean()); //for invoking instance methods

        context.put("sys", System.class);      //for invoking static methods



        /**

         * Merge data and template

         */

        StringWriter swOut = new StringWriter();

        template.merge(context, swOut);

        

        System.out.println(swOut);

  }

}

Invoke method