Next Generation Spring MVC with Spring Roo

Chicago, October 19 - 22, 2010

Next Generation Spring MVC with Spring Roo Stefan Schmidt & Keith Donald

Agenda

•  Mastering Spring MVC with Spring Roo •  Keeping up with project domain changes •  View scaffolding & customization •  How social is your application? •  Does your application speak Spanish? •  How secure is your application? •  Going with the flow

Mastering Spring MVC with Spring ROO

Master Spring MVC with Spring Roo

•  Best-practice Spring MVC out of the box –  REST support –  Round tripping of View artifacts –  Strong Templating support –  Theming support –  Pagination support –  i18n & i11n built-in –  Form validation based on JSR 303 –  Tested on popular Web browsers & Web containers

REST Support - Form Handling

Resource GET PUT POST DELETE Collection URI such as http://tld.com/pizzashop/toppings

List members of the collection (pagination possible)

Not used. Create new resource

Not used.

Member URI such as http://tld.com/pizzashop/toppings/5

Retrieve addressed resource

Update the addressed resource

Not used. Delete the addressed resource

Member URI such as http://tld.com/pizzashop/toppings?form

Creates a initialized but empty form for the resource (create use-case)

Not used. Not used. Not used.

Member URI such as http://tld.com/pizzashop/toppings/5?form

Creates an initialized form pre-populated with data of resource (update use-case)

Not used. Not used. Not used.

REST Support - Customizable JSON Binding

•  Roo offers two methods for integrating JSON binding: –  Option 1: Spring MVC detects Jackson

•  @RequestBody & @ResponseBody •  ContentNegotiatingViewResolver

–  Option 2: Built-in JSON handling managed in domain layer •  Customizable FlexJson integration

Spring Roo MVC Scaffolding Options

•  Generation of Web artifacts –  controller scaffold

•  generate a controller for a given entity –  controller all

•  generate controllers for all entities without an existing controller

–  controller class •  generate a simple Spring @MVC controller with a post and a

get method

DEMO View scaffolding

Keeping up with project domain changes

Keeping up with project domain changes

Past: Roo 1.0.x all-or-nothing approach –  either manage view templates manually after initial scaffold, –  or abstain from customization of JSP view artifacts

Future: Roo 1.1.x intelligent round-tripping –  introduction of customizable tag library –  reduction of JSP code by ~90% –  JSPs are now user editable

JSP View Round-Tripping

•  Customizable Tag libraries –  every tag has three common attributes

•  ‘id’ is used by Roo to identify tags via Xpath (required) •  ‘z’ is used to store a hash code which determines who ‘owns’

the tag (required) •  ‘render’ can be used to omit form rendering of the tag

JSP View Round Tripping Cont.

Example jspx file:

<form:update  id="fu_com_foo_Person"  modelAttribute="person"  path="/people"                                  z="3lX+WZW4CQVBb7OlvB0AvdgbGRQ=">  

   <field:datetime  dateTimePattern="${person_birthday_date_format}"  field="birthDay"                                            id="c_com_foo_Person_birthDay"  z="dXnEoWaz4rI4CKD9mlz+clbSUP4="/>  

   <field:select  field="car"  id="c_com_foo_Person_car"  itemValue="id"  items="${cars}"                                            path="/cars"  z="z2LA3LvNKRO9OISmZurGjEczHkc="/>  

   <field:select  field="cars"  id="c_com_foo_Person_cars"  itemValue="id"  items="${cars}"                                            multiple="true"  path="/cars"  z="c0rdAISxzHsNvJPFfAmEEGz2LU4="/>  </form:update>  

Hash Key Calculation

Things included in hash code calulation

Things not included in hash key calculation

Element name (name only, not namespace)

Name space of element names

Attribute names present in element White spaces used in the element

Attribute values present in the element Potential child elements

The ‘z’ attribute and its value

Any attribute (and value) whose name starts with '_'

The order of the attributes does not contribute to the value of a hash key

DEMO View round-tripping

View Scaffolding & Customization

View Scaffolding & Customization

•  Roo MVC views offer numerous customization points: –  Spring Theming support via CSS (and graphics) –  Global template structural adjustments via Tiles –  Page structure changes in JSP pages –  Portable templates through JSP tag library – 

Roo Default Tag Library

•  Spring JavaScript •  Dojo Toolkit •  Easy XML-based tags (no .java required) •  Tags for

–  form handling –  field rendering –  util (pagination, page decoration, language selection, …)

DEMO View customization

How social is your application?

Embedding Social Features

Embedding Social Features

Roo offers two shell commands to install features: •  Option 1

–  web mvc embed generic --url http://www.youtube.com/watch?v=Gb1Z0lfl52I –  automatic detection of social feature based on domain name –  easiest way to get a feature embedded

•  Option 2 –  web mvc embed map --provider GOOGLE_MAPS --location "Sydney,

Australia” –  web mvc embed finances --stockSymbol VMW –  specification of type of social feature –  better supported through tab completion

DEMO Embedding Social Features

Does your app speak Spanish?

i18n & l11n Support

•  Roo MVC scaffolding now defaults to locale ‘en’ –  install more languages with ‘web mvc install --language es’

command –  choice between 6 languages

–  very easy publishing of new languages •  addon create i18n --topLevelPackage com.foo.ru --locale ru --messageBundle

<path-to>/messages_fr.properties •  see slides for session ‘Hello, RooBot: Writing and Distributing Your Own

Spring Roo Add-Ons’

i18n & l11n Support

•  Roo MVC scaffolding uses two artifacts for managing localization (l11n) & internationalization (i18n) –  application.properties

•  application / domain specific messages •  managed by Roo round tripping

–  messages_XX.properties •  non- application / domain specific messages •  never touched by Roo after initial install

How secure is your application?

Integrating Spring Security

•  One simple command –  security setup –  URL-based security with applicationContext-security.xml

<http  auto-­‐config="true"  use-­‐expressions="true">      <form-­‐login  login-­‐processing-­‐url="/resources/j_spring_security_check"  login-­‐                                    page="/login"  authentication-­‐failure-­‐url="/login?login_error=t"/>      <logout  logout-­‐url="/resources/j_spring_security_logout"/>  

   <intercept-­‐url  pattern="/choices/**"  access="hasRole('ROLE_ADMIN')”/>        <intercept-­‐url  pattern="/resources/**"  access="permitAll"  />      <intercept-­‐url  pattern="/**"  access="permitAll"  />  </http>  

Going with the Flow

Spring Web Flow

•  One simple command –  web flow –  integrates Spring Web Flow into application

DEMO

Securing Your Application Spring Web Flow Selenium Tests

Resources & Links

•  Home → http://www.springsource.org/roo –  Contains links to all other resources

•  Forum → http://forum.springsource.org –  Roo team actively monitor forum and answer queries

•  Issues → http://jira.springframework.org/browse/ROO

•  Twitter → @SpringRoo –  Follow for updates, or include in tweets so we see them

•  Contact details –  Keith Donald @kdonald, [email protected] –  Stefan Schmidt @schmidtstefan, [email protected]

Q&A