How to use Map in velocity

This Example shows you how to use map in velocity. The method used in this example are described below:-
1:- Initialize velocity run time engine through method init().
2:- Create object of VelocityContext Class.
3:- Create Template class object, Template class object is used for controlling template methods and properties.

template.merge(context, writer): Merge method of the Template class is used here for merging the VelocityContext class object to produce the output.

MapClass.java


import java.io.*;

import java.util.*;

import org.apache.velocity.*;

import org.apache.velocity.app.*;



public class MapClass {



    public static void main(String[] args)

            throws Exception {

        VelocityEngine ve = new VelocityEngine();

        ve.init();



        ArrayList list = new ArrayList();

        Map map = new HashMap();



        map.put("rno", "1");

        map.put("name", "komal");

        map.put("libno", 1001);

        list.add(map);



        map = new HashMap();

        map.put("rno", "2");

        map.put("name", "santosh");

        map.put("libno", 1002);

        list.add(map);



        map = new HashMap();

        map.put("rno", "3");

        map.put("name", "ajay");

        map.put("libno", 1003);

        list.add(map);



        VelocityContext context = new VelocityContext();

        context.put("stuList", list);

        Template t = ve.getTemplate("./src/velocity/XMLOutput/xml.vm");

        StringWriter writer = new StringWriter();



        t.merge(context, writer);

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

    }

}

map.vm

Student:


#foreach( $stu in $stuList )

    $stu.rno

    $stu.name

    $stu.libno



#end

Output :

Student:

1

komal

1001



2

Santosh

1002



3

Ajay

1003

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