controllers
Purpose
A plug-in that sets up core Grails MVC architecture using the underlying Spring MVC component modelExamples
A controller:
class BookController {
def list = {
books:Book.list()
}
}
A tag library:
import java.text.*
class FormatTagLib {
def dateFormat = { attrs ->
out << new SimpleDateFormat(attrs.format).format(attrs.value)
}
}
Description
This plug-in deals with setting up Grails to use Spring MVC at its core to deal with web requests. The plug-in 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 api:org.codehaus.groovy.grails.web.errors.GrailsExceptionResolver for dealing with exceptions
multipartResolver
- An instance of org.springframework.web.multipart.commons.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 api:org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController, which is an instance of the Spring MVC Controller interface and deals with delegating onto actual Grails controller classes
groovyPageResourceLoader
- 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 location
groovyPagesTemplateEngine
- An instance of api:org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine, this class deals with rendering of GSP views
jspViewResolver
- An instance of api:org.codehaus.groovy.grails.web.servlet.view.GrailsViewResolver that knows how to resolve GSP views and is environment aware
The plug-in will also configure each Grails controller class as a prototyped Spring bean and each Grails tag library as a singleton Spring bean