最简单的hello world 程序。基础搭建：从网上下载velocity.zip，把lib下的.jar文件导入到工程中。另外还要导入velocity.jar 和velocity-dep.jar.hellosite.vm 放到工程的目录底下。
Hello $name ! Welcome to $site world !HelloWorld.java
package com; import java.io.StringWriter; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.VelocityEngine; public class HelloWorld { public static void main(String[] args) throws Exception { /* first, get and initialize an engine */ VelocityEngine ve = new VelocityEngine(); ve.init(); /* next, get the Template */ Template t = ve.getTemplate( " hellosite.vm " ); /* create a context and add data */ VelocityContext context = new VelocityContext(); context.put( " name " , " DingDangXiaoMa " ); context.put( " site " , " http://www.sun.com " ); /* now render the template into a StringWriter */ StringWriter writer = new StringWriter(); t.merge(context, writer); /* show the World */ System.out.println(writer.toString()); }}直接运行这个程序，就可以输入模板中的信息。2。web程序，servlet 调用vm显示信息。hello.vm 放在webRoot/web/下。
html > < body > #set($name = " Hello ! DingDang " ) Hello, $name woowoo </ body > </ html >servlet 文件：
public class SampleServlet extends VelocityServlet { protected Properties loadConfiguration(ServletConfig config) throws IOException, FileNotFoundException { Properties p = new Properties(); 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); p.setProperty( " runtime.log " , path + " velocity.log " ); return p; } public Template handleRequest(HttpServletRequest request, HttpServletResponse response, Context ctx) { /** * 我的一些测试输出 */ System.out.println( " Hello everyone " ); System.out.println( " sfdsfsd " ); System.out.println(ctx); System.out.println(ctx.toString()); System.out.println(request.getContextPath()); Template template = null ; try { /** * 主要代码 */ Velocity.init(); /** * 注意相对路径 */ template = Velocity.getTemplate( " /web/hello.vm " ); VelocityContext context = new VelocityContext(); context.put( " name " , " wowowowowowo hello hello hello " ); // template = Velocity.getTemplate("/web/sample.html"); } catch (Exception e) { e.printStackTrace(); } return template; }}以上就是两个最简单的velocity的例子。 一个是java application 一个是java web程序。参考资料：http://www.javaresearch.org/article/38895.htm
相关资源：敏捷开发V1.0.pptx