Grails Controllers
What is a controller?
A controller handles requests and creates or prepares the response. They can generate the response or delegate to a view. To create a controller simply create a class whose name ends with "Controller" and place it within the "grails-app/controllers" directory.
The first part of your controller name is mapped to a URI and each action defined within your controller maps to URI within the controller name URI.
Controllers are request-scoped. A new instance is created for each request.
