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 Template Engines > Velocity > Map Variables

Map Variables 

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 creating and iterating map variables.

File Name  :  
/VELOCITY001/config/map_variables.vm 
view sourceprint?
01## Map variables
02#set( $simple_map1 = { 1 : "ONE", 2 : "TWO", 3 : "THREE", 4 : "FOUR" })
03#set( $simple_map2 = { "name" : "Sriram", "age" : 4 })
04 
05Key Set : $simple_map1.keySet()
06Values : $simple_map1.values()
07 
08#foreach ($entry in $simple_map1.entrySet())
09Key : $entry.key and value : $entry.value
10#end
11 
12#foreach ($key in $simple_map1.keySet())
13Key : $key and value : $simple_map1.get($key)
14#end
15 
16Student name : $simple_map2.name
17Student age : $simple_map2.age

File Name  :  
com/bethecoder/tutorials/velocity/tests/MapVariablesTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
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;

public class MapVariablesTest {

  /**
   * @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("map_variables.vm");
        
        /**
         * Prepare context data
         */
        VelocityContext context = new VelocityContext();

        /**
         * Merge data and template
         */
        StringWriter swOut = new StringWriter();
        template.merge(context, swOut);
        
        System.out.println(swOut);
  }
}
   

It gives the following output, 
Key Set : [1, 2, 3, 4]
Values : [ONE, TWO, THREE, FOUR]

Key : 1 and value : ONE 
Key : 2 and value : TWO 
Key : 3 and value : THREE 
Key : 4 and value : FOUR 

Key : 1 and value : ONE 
Key : 2 and value : TWO 
Key : 3 and value : THREE 
Key : 4 and value : FOUR 

Student name : Sriram
Student age : 4



 
  


  
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