http://www.java2s.com/Code/Java/Velocity/UseVelocitytogenerateHTMLbasedemail.htm

import java.io.StringWriter;

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;

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

public class EmailDemo
{
    public static void main( String[] args )
        throws Exception
    {
        /*
         *   first, get and initialize an engine
         */

        VelocityEngine ve = new VelocityEngine();
        ve.init();

        /*
         *   organize our data 
         */

        ArrayList list = new ArrayList();
        Map map = new HashMap();

        map.put("name", "Cow");
        map.put("price", "$100.00");
        list.add( map );
 
        map = new HashMap();
        map.put("name", "Eagle");
        map.put("price", "$59.99");
        list.add( map );

        map = new HashMap();
        map.put("name", "Shark");
        map.put("price", "$3.99");
        list.add( map );

        /*
         *  add that list to a VelocityContext
         */

        VelocityContext context = new VelocityContext();
        context.put("petList", list);

        /*
         *   get the Template  
         */

        Template t = ve.getTemplate( "./src/email_html.vm" );

        /*
         *  now render the template into a Writer, here 
         *  a StringWriter 
         */

        StringWriter writer = new StringWriter();

        t.merge( context, writer );

        /*
         *  use the output in the body of your emails
         */

        System.out.println( writer.toString() );
    }
}

-------------------------------------------------------------------------------------

  <HTML>
    <HEAD>
      <TITLE>Pet Store Sale!</TITLE>
    </HEAD>


    <BODY>
      <CENTER>
      <B>$petList.size() Pets on Sale!</B>
      
      <BR/>
      This is an email generated by velocity
      <BR/>
      This month only, choose from :
    
      #set( $count = 1 )  
      <TABLE>
        #foreach( $pet in $petList )
          <TR>
            <TD>$count)</TD>
            <TD>$pet.name</TD>
            <TD>$pet.price</TD>
          </TR>
          #set( $count = $count + 1 )
        #end
      </TABLE>
      
     <I>Call Today!</I>
     Bests <br>
     www.java2s.com
      </CENTER>
 
    </BODY>
  </HTML>

 ===camel 
ArrayList list = new ArrayList();
         Map map = new HashMap();        map.put("name", "Cow");
         map.put("price", "$100.00");
         list.add( map );
  
         map = new HashMap();
         map.put("name", "Eagle");
         map.put("price", "$59.99");
         list.add( map );        map = new HashMap();
         map.put("name", "Shark");
         map.put("price", "$3.99");
         list.add( map ); 
  template.sendBody("direct:route1", list);
   
   <route>
    <from uri="direct:route1"/>
    <to uri="log:route1?level=INFO"/>
    <to uri="velocity:table.vm" />
    <to uri="log:route1?level=INFO"/>
   </route><HTML>
     <HEAD>
       <TITLE>Pet Store Sale!</TITLE>
     </HEAD>     <BODY>
       <CENTER>
       <B>${body}.size() Pets on Sale!</B>
       
       <BR/>
       This is an email generated by velocity
       <BR/>
       This month only, choose from :
     
       #set( $count = 1 )  
       <TABLE>
         #foreach( $pet in ${body} )
           <TR>
             <TD>$count)</TD>
             <TD>$pet.name</TD>
             <TD>$pet.price</TD>
           </TR>
           #set( $count = $count + 1 )
         #end
       </TABLE>
       
      <I>Call Today!</I>
      Bests <br>
      www.java2s.com       </CENTER>
  
     </BODY>
   </HTML>