Apache Velocity Part 5 – condition #if

February 1, 2017 by omt

Apache Velocity has if condition like all other programming language. Find below syntax of #if in velocity.

Single if statement.
#if

#end

If with ElseIf.

#if


#elseif

#end

Find below example template for more details.

condition.vm

#if($i == 0) 
i is zero
#end

#set($i = 1)

#if(!($i == 0))
i is non zero
#end

#if($i == 2)
i is two
#elseif ($i == 1)
i is one
#end

#set($name = "omt")

#if($name == "omt")
name is omt
#end

#if($name == "lab" || $i == 1)
$name OR $i 
#end

#if($name == "lab" || $i == 2)
$name OR $i 
#end



#if($name == "omt" && $i == 1)
$name AND $i 
#end

#if($i == 0)

i is zero

#end

#set($i = 1)

#if(!($i == 0))

i is non zero

#end

#if($i == 2)

i is two

#elseif ($i == 1)

i is one

#end

#set($name = "omt")

#if($name == "omt")

name is omt

#end

#if($name == "lab" || $i == 1)

$name OR $i

#end

#if($name == "lab" || $i == 2)

$name OR $i

#end

#if($name == "omt" && $i == 1)

$name AND $i

#end

Find below code sample.

package com.omt.velocity.example;

import java.io.StringWriter;

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

public class ConditionVelocityExample {

	public static void main(String[] args) {

		Velocity.init();

		VelocityContext context = new VelocityContext();
		context.put("i", 0);

		Template t = Velocity.getTemplate("condition.vm");

		StringWriter sw = new StringWriter();

		t.merge(context, sw);

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

	}

}

package com.omt.velocity.example;

import java.io.StringWriter;

import org.apache.velocity.Template;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.Velocity;

public class ConditionVelocityExample {

public static void main(String[] args) {

Velocity.init();

VelocityContext context = new VelocityContext();

context.put("i", 0);

Template t = Velocity.getTemplate("condition.vm");

StringWriter sw = new StringWriter();

t.merge(context, sw);

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

}

Output :

i is zero


i is non zero

i is one


name is omt

omt OR 1 




omt AND 1

i is zero

i is non zero

i is one

name is omt

omt OR 1

omt AND 1

omt Lab

Apache Velocity Part 5 – condition #if

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