Spring 3 MVC CodeMash 2009
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NFJS Software Symposium Series 2009
Ken SipeTechnology Director, Perficient (PRFT)
Spring 2.5 MVC
NFJS Software Symposium Series 2009
Ken SipeTechnology Director, Perficient (PRFT)
Spring 2.5 MVC3.0
Spring 3.0 MVC
SOA/Enterprise Architect Developer (Java, C++, C#, Objective-C) Instructor (VisiBroker, RUP, OOAD) Speaker (NFJS, JavaOne, JAX-India) Involved in Java since 1996 Author (Pro Spring 3.0)
Speaker Qualifications
kensipe@gmail.comkensipe.blogspot.comhttp://del.icio.us/kensipetwitter: kensipe
Spring 3.0 MVC
Agenda Spring 3.0 - ADD Spring MVC From Controller to @Controller
Controller Mapping URL Mapping Request Parameters Model Attributes
Spring Forms Summary
Agenda
Spring 3.0 MVC
Spring 3.0 - ADDAnnotated Driven Development
OperationOperation
AttributeAttribute
AccountService
OperationOperation
AttributeAttribute
AccountDAO
<<uses>>AttributeAttribute
DataSource
<<uses>>
Spring 3.0 MVC
5
Introduction to IoC
OperationOperation
AttributeAttribute
AccountService
OperationOperation
AttributeAttribute
AccountDAO
<<uses>>AttributeAttribute
DataSource
<<uses>>
Spring 3.0 MVC
5
Introduction to IoC
service dependency on datasource
OperationOperation
AttributeAttribute
AccountService
OperationOperation
AttributeAttribute
AccountDAO
<<uses>>AttributeAttribute
DataSource
<<uses>>
OperationOperation
AttributeAttribute
DAOFactory
<creates>
Spring 3.0 MVC
5
Introduction to IoC
dependency simply moves
OperationOperation
AttributeAttribute
AccountService
OperationOperation
AttributeAttribute
AccountDAO
<<uses>>AttributeAttribute
DataSource
<<uses>>
OperationOperation
AttributeAttribute
ApplicationContext
<creates>
Spring 3.0 MVC
6
Spring IoC
Client:
Spring 3.0 MVC
7
XML Configuration
Spring 3.0 MVC
There are 3 types of dependency injections in the worldConstructor
values are injected through the constructor at object construction
Setter object is created, then values are set through each
property setterField
object is created, then the values are (usually) reflectively set on the field (by passing the setter)
8
Types of Injections
Spring 3.0 MVC
Spring Annotations
Spring 3.0 MVC
@Component ** Indicates that a class is a component Class is a candidate for auto-detection Custom component extensions
@Controller Specialized Component Typically used with RequestMapping annotation Discussed in section on web mvc
@Repository Now an extension of @Component
@Service Intended to be a business service facade
Spring 3.0 MVC
@Autowired Marks a constructor, field, setter or config method for injection. Fields are injected
After construction @Autowired(required=false)
@Qualifier Qualifies a bean for autowiring May be customized
@Required Marks a method as being injection required
Spring 3.0 MVC
Constructor
Setter
Field
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Types of Injections
Spring 3.0 MVC
configuration method
with any number of arguments
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New Injection Type
Spring 3.0 MVC
Spring MVC
Spring 3.0 MVC
Spring Web MVC foundation for all spring web modules
Spring JavaScriptajax support
Spring Web Flow framework for stateful interactions
Spring FacesJSF support
Spring PortletPortlet jsr-168 and jsr-286 support
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Spring Web
Spring 3.0 MVC
MVC = Model - View - Controllerseparates:
business navigation presentation logic
Improves testability of logic and navigation
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MVC Overview
Spring 3.0 MVC
Modeldata container
displayed by the view manipulated by the controller
commonly a simple map View
typically jsp or xml Controller
controlling logic conjuror of model navigation validation 17
MVC on the Web
Dispatcher Servlet
Controller
Model
DB
request request
data accessnavigation
view jsp
access
render
Spring 3.0 MVC
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Spring 3.0 MVC
DispatcherServletSpring provided front controllerControls request routing
ControllersUser created POJOStandard Spring beans
ViewResponsible for rendering a response
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Spring MVC Taxonomy
TIP: 1. Delegate to service beansfor business logic2. handle only navigation
Spring 3.0 MVC
ModelAndViewstores model dataassociates a view to the request
can be a view implementation or a logical name
ViewResolverUsed to map logical view names to view
implementations HandlerMapping
Strategy interfaceUsed by DispatcherServlet to map requests to
controllers20
Core MVC Components
Spring 3.0 MVC
Extensive SupportJSP, Velocity, FreeMarker, JasperReportersPDF, Excel
Views are mapped by ViewResolvers
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Spring Views
Spring 3.0 MVC
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Spring View
Spring 3.0 MVC
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Spring Controller Hierarchy
Spring 3.0 MVC
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Spring MVC Old School
Spring 3.0 MVC
25
Spring MVC Old School
Spring 3.0 MVC
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Spring MVC Old School - Working with Requests
Spring 3.0 MVC
DEMO: Spring MVC Old School
Spring 3.0 MVC
From Controller to @ControllerSpring 3 @MVC
Spring 3.0 MVC
@Controller Stereotype used to “Controller” of MVC Scanned for RequestMappings
@RequestMapping Annotates a handler method for a request Very flexible
@RequestParam Annotates that a method parameter should be bound to a web request
parameter
SessionAttributes Marks session attributes that a handler uses
Spring MVC Annotations
Spring 3.0 MVC
Doesn’t implement an Interface Multiple request mappings High degree of flexibility
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New Controller Issues
Spring 3.0 MVC
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Advantages of Controller Interfaces
Spring 3.0 MVC
31
It looks like your trying to build a controller
Advantages of Controller Interfaces
Spring 3.0 MVC
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Advantages of Controller Interfaces
Spring 3.0 MVC
Return Type? Parameters?
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A World Without Rules
Spring 3.0 MVC
Parameters can be Request / response / session WebRequest InputStream OutputStream @RequestParam +++
Return types ModelAndView Object Model Object Map for exposing model View Object String which is a view name Void… if method wrote the response content directly
Spring MVC Parameters and Return Types
Spring 3.0 MVC
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Spring MVC Controller Evolution
mixed model: standard looking old school controller withoutan interface.
Spring 3.0 MVC
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Spring MVC Controller Evolution
refactored method: inject the model, return the view
Spring 3.0 MVC
36
Spring MVC Controller Evolution
another refactor: just return the model data, view is assumed through convention.
Spring 3.0 MVC
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Spring MVC By Convention
GET /hotel/list
View selectedfrom request path
Added to Model
Conventions:hotel = HotelControllerlist = method
Spring 3.0 MVC
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/hotel/index
/hotel/show
/hotel/list
Multi-Action Convention
Spring 3.0 MVC
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/hotel/show?id=42
Parameters
Spring 3.0 MVC
Spring MVC Configurations
Spring 3.0 MVC
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URL Autonomy
http://<host>:<port>/petclinic/main/owner/show
Web Application/Servlet/Controller/method
Spring 3.0 MVC
42
DispatcherServlet
Spring 3.0 MVC
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DispatcherServlet
Spring 3.0 MVC
DefaultAnnotationHandlerMappingannotation based - @Controller
SimpleUrlHandlerMappingconfiguration basedstill works with annotations
ControllerClassNameHandlerMapping
UrlFileNameViewControllerviews without a controller
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Handler Mappings
Spring 3.0 MVC
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Mapping by Request Mapping
Spring 3.0 MVC
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Mapping by Controller
Spring 3.0 MVC
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Mapping by Convention
Spring 3.0 MVC
Favor @Controller Convention over configuration Group controller logic
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Spring MVC Tips
Spring 3.0 MVC
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Controller Class Name Conventions
/petclinic/main/owner/show
org...petclinic.Owner
Spring 3.0 MVC
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Controller Class Name Conventions - Base Package
/petclinic/main/patient/owner/show
org...petclinic.Owner
Spring 3.0 MVC
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Controller Class Name Conventions - Base Package
/petclinic/main/patient/owner/show
org...petclinic.Owner
prefix
Spring 3.0 MVC
Order of method selection: First by request method (GET, POST, PUT,
DELETE) Second by parameter presence/absense, or
parameter value third by method name fourth by URL
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@RequestMapping
Spring 3.0 MVC
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Method-Relative Request Mapping
/owner, /owner/*
GET /owner/form
POST /owner/form
GET /owner/find
GET /owner/find?submit=
Spring 3.0 MVC
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View Name Conventions
Show owner:
Add or edit owner:
Search owner:
GET /owner/show
GET /owner/formGET /owner/form?id=POST /owner/form
GET /owner/findGET /owner/find?submit=
Spring 3.0 MVCViews without Controllers
Some views don’t review a controller /index.htm -> “index”
Spring 3.0 MVC
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@RequestParam
type conversion
optional request parameter
TIP: for optional parameters use objects
GET /owner/show?submit=2
Spring 3.0 MVC
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@PathVariable - RESTFUL
GET /owner/show/2
Spring 3.0 MVC
Automatically created on every request Implicit Model
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Add Model Attributes
Spring 3.0 MVC
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Adding a Single Model Attribute
Implicit Model
@ModelAttribute - customize the name
TIP: If you need more than one modelattribute, take model as a input argument
Spring 3.0 MVC
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More Crazy Stuff
Annotation Access to:HeadersCookies
Spring 3.0 MVC
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Working with Session
Session Attribute for “pet”
“pet” will be added to session
“pet” will be removed from session
Spring 3.0 MVC
Spring Forms
Spring 3.0 MVC
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Model Attributes as Command Objects
Bind command object to form
Bind request to command object
Spring 3.0 MVC
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Submitting Forms
Spring 3.0 MVC
Hibernate Validator JSR-303 Bean Validation
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Model Validation
Spring 3.0 MVC
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Validation Checks in Controller
Spring 3.0 MVC
DEMO: Spring 3.0 MVC
Spring 3.0 MVC
Closing and Q&A References
Spring Framework: http://www.springsource.com/download/community?project=Spring%20Framework
Spring Docs: http://www.springsource.org/documentation Session Source Code: http://groups.google.com/group/codemash
Please fill out the session evaluation Ken Sipe – kensipe@gmail.com
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