(Quick Reference)
controllers
Purpose
A plugin that configures core Grails MVC architecture using the underlying Spring MVC component model
Examples
A controller:
class BookController {
def list() {
[books:Book.list()]
}
}A tag library:
import java.text.SimpleDateFormatclass FormatTagLib {
def dateFormat = { attrs ->
out << new SimpleDateFormat(attrs.format).format(attrs.value)
}
}Description
This plugin configures Grails to use Spring MVC at its core to deal with web requests. The plugin sets up the
GrailsDispatcherServlet and necessary Spring beans (see below) for controllers, tag libraries and Groovy Server Pages (GSP)
Configured Spring Beans:
exceptionHandler - An instance of GrailsExceptionResolver for dealing with exceptionsmultipartResolver - An instance of CommonsMultipartResolver used for dealing with file uploads using Apache Commons File Upload. If you do not wish to use this, set grails.disableCommonsMultipart to true in Config.groovy. Be aware that disabling multipart handling will effect the behaviour of g:actionSubmit which needs to inspect the parameters (requiring the multipart request to be parsed) during the URL mapping phase.simpleGrailsController - An instance of SimpleGrailsController, which is an instance of the Spring MVC Controller interface and deals with delegating onto actual Grails controller classesgroovyPageResourceLoader - Configured in development mode only or when the grails.gsp.view.dir is set. This is a Spring ResourceLoader that knows how to load GSP views from the an arbitrary locationgroovyPagesTemplateEngine - An instance of GroovyPagesTemplateEngine, this class deals with rendering of GSP viewsjspViewResolver - An instance of GrailsViewResolver that knows how to resolve GSP views and is environment aware
The plugin also configures each Grails controller class as a prototyped Spring bean and each Grails tag library as a singleton Spring bean
