spring 3 mvc codemash 2009
DESCRIPTION
Spring 3 MVC presented at Codemash 2009. If you want the source code send an email to kensipe at gmailTRANSCRIPT
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
[email protected]://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
12
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
15
Spring Web
Spring 3.0 MVC
MVC = Model - View - Controllerseparates:
business navigation presentation logic
Improves testability of logic and navigation
16
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
18
Spring 3.0 MVC
DispatcherServletSpring provided front controllerControls request routing
ControllersUser created POJOStandard Spring beans
ViewResponsible for rendering a response
19
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
21
Spring Views
Spring 3.0 MVC
22
Spring View
Spring 3.0 MVC
23
Spring Controller Hierarchy
Spring 3.0 MVC
24
Spring MVC Old School
Spring 3.0 MVC
25
Spring MVC Old School
Spring 3.0 MVC
26
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
30
New Controller Issues
Spring 3.0 MVC
31
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
31
Advantages of Controller Interfaces
Spring 3.0 MVC
Return Type? Parameters?
32
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
34
Spring MVC Controller Evolution
mixed model: standard looking old school controller withoutan interface.
Spring 3.0 MVC
35
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
37
Spring MVC By Convention
GET /hotel/list
View selectedfrom request path
Added to Model
Conventions:hotel = HotelControllerlist = method
Spring 3.0 MVC
38
/hotel/index
/hotel/show
/hotel/list
Multi-Action Convention
Spring 3.0 MVC
39
/hotel/show?id=42
Parameters
Spring 3.0 MVC
Spring MVC Configurations
Spring 3.0 MVC
41
URL Autonomy
http://<host>:<port>/petclinic/main/owner/show
Web Application/Servlet/Controller/method
Spring 3.0 MVC
42
DispatcherServlet
Spring 3.0 MVC
42
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
44
Mapping by Request Mapping
Spring 3.0 MVC
45
Mapping by Controller
Spring 3.0 MVC
46
Mapping by Convention
Spring 3.0 MVC
Favor @Controller Convention over configuration Group controller logic
47
Spring MVC Tips
Spring 3.0 MVC
48
Controller Class Name Conventions
/petclinic/main/owner/show
org...petclinic.Owner
Spring 3.0 MVC
49
Controller Class Name Conventions - Base Package
/petclinic/main/patient/owner/show
org...petclinic.Owner
Spring 3.0 MVC
50
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
52
Method-Relative Request Mapping
/owner, /owner/*
GET /owner/form
POST /owner/form
GET /owner/find
GET /owner/find?submit=
Spring 3.0 MVC
53
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
55
@RequestParam
type conversion
optional request parameter
TIP: for optional parameters use objects
GET /owner/show?submit=2
Spring 3.0 MVC
56
@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
58
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
59
More Crazy Stuff
Annotation Access to:HeadersCookies
Spring 3.0 MVC
60
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
62
Model Attributes as Command Objects
Bind command object to form
Bind request to command object
Spring 3.0 MVC
63
Submitting Forms
Spring 3.0 MVC
Hibernate Validator JSR-303 Bean Validation
64
Model Validation
Spring 3.0 MVC
65
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 – [email protected]
Summary