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Velocity (Apache Velocity) – Notes
Definition:

Apache Velocity is a Java-based template engine.

It is used to generate dynamic web pages, emails, code, and other text-based content.

It allows separation of Java logic and presentation layer.
Key Features:

Template Language (VTL): Simple syntax to use variables, loops, and conditionals.

Separation of Concerns: Keeps UI (templates) separate from backend logic.

Lightweight & Fast: Minimal overhead and easy to integrate.

Extensible: Can be used for custom code generation, documentation tools, etc.
Common Uses:

Web application front-ends (with frameworks like Struts).

Email content generation.

Automated report and document generation.

Source code generation.
Basic Syntax:

Variables: $name, $user.address

Set a variable: #set( $x = "Hello" )

Conditional:
velocity
CopyEdit
#if( $age > 18 )
Adult
#else
Minor
#end

Loop:
velocity
CopyEdit
#foreach( $item in $shoppingList )
$item
#end
Architecture:

Context: Holds data (Java objects) passed to the template.

Template: .vm file containing VTL code.

Engine: Merges the template with context data to produce output.
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