XML handling in a template using Velocity

This Example shows you how to use XML file in a velocity template and also shows that use of macro to wrap HTML tag in velocity template. 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.

#macro ( recursive $e $indent ): This is the method for creating function in .vm file.

#recursive( $root.getRootElement() $i ): This is used to call recursive function that we have already created.

XMLHandling.java

package velocity.XML;



import java.io.*;



import org.apache.velocity.Template;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.Velocity;



import org.jdom.Document;

import org.jdom.input.SAXBuilder;



public class XMLHandling {



    public static void main(String args[]) {

        try {

            Velocity.init();



            SAXBuilder builder;

            Document root = null;

            try {

                builder = new SAXBuilder("org.apache.xerces.parsers.SAXParser");

                root = builder.build("./src/velocity/XML/handling.xml");

            } catch (Exception e) {

                System.out.println(e);

            }



            VelocityContext context = new VelocityContext();

            context.put("root", root);



            Template template = Velocity.getTemplate("./src/velocity/XML/handling.vm");



            StringWriter writer = new StringWriter();

            template.merge(context, writer);



            System.out.println(writer);

        } catch (Exception e) {

            System.out.println(e);

        }



    }

}

handling.xml

<?xml version="1.0" encoding="UTF-8"?>

<document>

    <student>

        <rno>1</rno>

        <name>Komal</name>

    </student>

    <student>

        <rno>2</rno>

        <name>Sandy</name>

    </student>

    <student>

        <rno>3</rno>

        <name>Ajay</name>

    </student>

</document>

ClassMethods.vm

#macro (
recursive $e $indent )     

    #if( $e.getChildren().size() > 0 )

       
$indent <$e.getName()> 

       
#foreach ($child in $e.getChildren() ) 

           
#recursive( $child "$indent  " )

       
#end

       
$indent </$e.getName()>

    #else

       
$indent <$e.getName()>

       
$indent    $e.getTextTrim()

       
$indent </$e.getName()>

    #end

#end



#set($i = " ")



Handling.xml



#recursive( $root.getRootElement() $i )



Data directly :



Rno  :
$root.getRootElement().getChild("student").getChild("rno").getText()

Name :
$root.getRootElement().getChild("student").getChild("name").getText()

Output :

Handling.xml

<document>

    <student>

        <rno>1</rno>

        <name>Komal</name>

    </student>

    <student>

        <rno>2</rno>

        <name>Sandy</name>

    </student>

    <student>

        <rno>3</rno>

        <name>Ajay</name>

    </student>

</document>



Data directly :



Rno  : 1

Name : Komal

Download code

Leave your comment:
Name:
Email:
URL:
Title:
Comments:
Enter Code:
	Note: Emails will not be visible or used in any way, and are not required. Please keep comments relevant. Any content deemed inappropriate or offensive may be edited and/or deleted. No HTML code is allowed. Line breaks will be converted automatically. URLs will be auto-linked. Please use BBCode to format your text.