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.

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.

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

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