执行运行命令，结果：

/**
 * @author Liang.xf  2004-12-14
 */
public class Student {
 //注意class的属性是public的
 public String no = "";
 public String address = "";
 public Student(String _no, String _address) {
  no = _no;
  address = _address;
 }
 
 public String getAddress() {
  return address;
 }
 
 public void setAddress(String address) {
  this.address = address;
 }
 
 public String getNo() {
  return no;
 }
 
 public void setNo(String no) {
  this.no = no;
 }
}
这个Student是实足的javabean，或者说是data bean，常见的用来装载数据的类，然后我们修改HelloVelocity.java，把：
temp.add("1");
 temp.add("2");
替换成：
 temp.add(new Student("123", "Guangzhou"));
 temp.add(new Student("456", "Zhuhai"));

再把hellovelocity.vm的内容改为：
#foreach ($s in $students)
  <$velocityCount> Address: $s.address
#end
重新编译和执行运行命令，结果如下：
  <1> Address: Guangzhou
  <2> Address: Zhuhai
这样把list中Student的数据打印了出来，大功告成！这里用了Velocity的内建变量$velocityCount，指的是默认的列举序号，从1开始，也可以改成0开始，但需要在Velocity.properties中更改，Velocity.properties位于velocity-1.4.jar包内的目录org\apache\velocity\runtime\defaults 下。
再复杂一些的迭代怎么处理呢？我们看看下面的模版例子就清楚了：
#foreach ($element in $list)
    -- inner foreach --
    #foreach ($element in $list)
        This is $element.
        $velocityCount
    #end
    -- inner foreach --

    -- outer foreach --
    This is $element.
    $velocityCount
    -- outer foreach --
#end

看出来了吧，Velocity是支持标签嵌套的，这个可是很强大的功能，这里就不深入演示了，如果有兴趣，自己试试吧。

其实，稍为深入思考刚刚我们举的例子，就已经可以看出来，Velocity的用处在哪里？即Servlet + Velocity的模式，另外，还记得我们早期Jsp开发的模式Jsp+JavaBean吗？在这里，我们更改为Servlet+JavaBean+Velocity，想想，是不是已经替代了Jsp+JavaBean，并更彻底的把Java代码去除在Jsp（vm）外，如果光使用Struts（Servlet+Jsp），那么带来的代价是Java代码总或多或少出现在Jsp上，即使可以做到不出现Java代码，但做过复杂架构系统的开发者都知道，代价也是很昂贵的，并且在可维护性、和网页设计师的集成开发上存在一定的困难，所以我们在这里能感觉到，Servlet+JavaBean+Velocity的模式较好的实现了OOD的概念。而在效率上，大家也不用担心，此种结合方式比Servlet+Jsp的方式要高效一些。

愿意了解Velocity的人应该不少，但真正实用到项目的，也许不多（还是有些项目在使用，如Jute），毕竟和Jsp比起来，Jsp更标准、更广泛使用和有不少开发工具已经支持Jsp开发。但Velocity的功能不会仅仅局限在和Jsp竞争的局面，由上可看出它在自动代码输出方面功能很强，前面提到Turbine就是采用Velocity来生成很多代码，你也可以稍加改动就可以做成代码生成器，或其他模版生成上，都是很不错的想法。

好了，我们再来看看要深入Velocity来做项目，还需要注意的一些常见问题吧，首先是国际化的问题，

Velocity本身支持模版的国际化编码转换，看看Velocity提供的方法：
Public Template getTemplate (Stirng template, String encoding)，
由此推测这样做其实不能彻底的做到国际化。

Servlet直接继承VelocityServlet。需要引入velocity-dep-1.4.jar，velocity-1.4.jar两个包。

package com.javayou;
import java.io.IOException;
import java.io.FileNotFoundException;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.velocity.Template;
import org.apache.velocity.context.Context;
import org.apache.velocity.servlet.VelocityServlet;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.exception.ParseErrorException;

/**
 * Sample of how to use the VelocityServlet.
 * This example shows how to add objects to the context and
 * pass them to the template.
 *
 * @author willians He
 * @author <a href="mailto:hzxmsn@163.com">willians He.</a>
 * @version $Id: SampleServlet.java,v 1.5.8.1 2006/07/15 10:01:29 geirm Exp $
 */
public class SampleServlet extends VelocityServlet
{
   
    /**
     *   Called by the VelocityServlet
     *   init().  We want to set a set of properties
     *   so that templates will be found in the webapp
     *   root.  This makes this easier to work with as
     *   an example, so a new user doesn't have to worry
     *   about config issues when first figuring things
     *   out
     */
    protected Properties loadConfiguration(ServletConfig config )
        throws IOException, FileNotFoundException
    {
        Properties p = new Properties();

        /*
         *  first, we set the template path for the
         *  FileResourceLoader to the root of the
         *  webapp.  This probably won't work under
         *  in a WAR under WebLogic, but should
         *  under tomcat :)
         */

        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 );

        /**
         *  and the same for the log file
         */

        p.setProperty( "runtime.log", path + "velocity.log" );

        return p;
    }

    /**
     *  <p>
     *  main routine to handle a request.  Called by
     *  VelocityServlet, your responsibility as programmer
     *  is to simply return a valid Template
     *  </p>
     *
     *  @param ctx a Velocity Context object to be filled with
     *             data.  Will be used for rendering this
     *             template
     *  @return Template to be used for request
     */  
    public Template handleRequest( HttpServletRequest request,
 HttpServletResponse response, Context ctx )
    {       
        /*
         *  set up some data to put into the context
         */

      
        String p1 = "Bob-->congratulation to  Bob";
        String p2 = "Harold-->congratulation to  Harold";
        String p3 = "Bob--->this is Wrong enter Bob";
        String p4 = "Harold-->this is Wrong enter  Harold";
        String jpgurl2="/test/picture/lxy01.jpg";
        String jpgurl1="/test/picture/ch020.jpg";
       
//      为后面的展示，提前输入List数值
        List temp = new ArrayList();
        temp.add(new Students("123", "Guangzhou"));
        temp.add(new Students("321", "Guangzhou"));
        temp.add(new Students("456", "Shanghai"));
        temp.add(new Students("654", "Shanghai"));
        ctx.put("list", temp);

       
        Vector personList = new Vector();
        Vector personList2 = new Vector();
       
        String name=null;
        String pass=null;
        if(!request.getParameterMap().isEmpty())
        {
            name = request.getParameter("Account");
            pass = request.getParameter("Password");
           
        }else {
             name="myname";
             pass="123456";
        }
       
        if(name.equals("myname")&&pass.equals("123456")) {      
             personList.addElement( p1 );
             personList.addElement( p2 );
             personList2.addElement( jpgurl1 );
        }
        else{
             personList.addElement( p3 );    
             personList.addElement( p4 );
             personList2.addElement( jpgurl2 );
        }

        /*
         *  Add the list to the context.
         *  This is how it's passed to the template.
         */

        ctx.put("theList", personList );
        ctx.put("theImageList", personList2 );
       
        /*
         *  get the template.  There are three possible
         *  exceptions.  Good to know what happened.
         */

        Template outty = null;
       
        try
        {
            //outty =  getTemplate("sample.html");
            outty=getTemplate("templat/picMoudle/pic1.html");
           
           
        }
        catch( ParseErrorException pee )
        {
            System.out.println("SampleServlet : parse error for template " + pee);
        }
        catch( ResourceNotFoundException rnfe )
        {
            System.out.println("SampleServlet : template not found " + rnfe);
        }
        catch( Exception e )
        {
            System.out.println("Error " + e);
        }
        return outty;
    }
  
}
 

Students.java

/*
 * 创建日期 2006-7-18
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
package com.javayou;

/**
 * @author Willian He
 *
 */
public class Students {
    public String no = "";
    public String address = "";
    public Students(String _no, String _address) {
      no = _no;
      address = _address;
    }
    public String getAddress() {
        return address;
       }
    public void setAddress(String address) {
        this.address = address;
       }
    public String getNo() {
        return no;
       }
      
       public void setNo(String no) {
        this.no = no;
       }

}

模板

pic1.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   
 <title>Sample Picture page</title></head>
<body bgcolor="#ffffff">
<center>

<h2>Hello ,How are you!</h2>
<i>Here's the list of picture</i>

#set ($foo="The Velocity")
<table width="750" height="200" border="1" cellpadding="1" cellspacing="1">
    <tr>
   <td bgcolor="#eeeeee" align="center">
   Show the picture  <br> 
  ##foreach ($s1 in $list)
   #foreach ($s in $list)
    #if($s.address=="Shanghai")
     this is<$velocityCount> Address: $s.address $s.no<br>
    #else 
     that is<$velocityCount> Address: $s.no,$s.address <br> 
    #end
   #end
  ##end   
        </td>
    </tr>
    #foreach ($name in $theList)
    <tr align="center">
        <td bgcolor="#eeeeee">$name</td>
    </tr>
    #end
    #foreach ($name in $theImageList)
    <tr>
        <td align="center"><img src="$name"  title="give me" /></td>
 </tr>
 <tr>
  <td align="center"><font color="#ff0255">$name</font></td>
    </tr>
    #end
  <tr>
       <td bgcolor="#green" align="center">$foo</td>
    </tr>
</table>
#macro(tablerows $color $somelist)
#foreach($something in $somelist)
 <tr>
 <td bgcolor=$color>$something</td>
 </tr>

#end
#end

#set($greatlakes=["Superior","Michigan","Huron","Erie","Ontario"])
#set($color=("bllack"))
<table>
#tablerows($color $greatlakes)
</table>
<a href="http://localhost:8080/test/MyJsp.jsp">回上一页</a>

</center>
</html>