The document discusses the Play framework, an agile web development framework created by Guillaume Bort in 2007. It provides an overview of Play's main concepts including its stateless MVC architecture, ability to fix bugs and reload code without restarting, efficient templating, and support for test-driven development. The document also covers getting started with Play and using modules to add additional functionality.

1. Play! framework
Agile web development.
Created by Guillaume Bort 2007
Sẩm Bảo Chung Web development with Play!

2. Agenda
Overview
Main Concept
 Five cool things you can do with play
 Fix the bug and hit Reload
 Simple stateless MVC architecture
 Efficient template engine
 Test driven development
 Job
Play enviroment
Discuss
Sẩm Bảo Chung Web development with Play!

3. Play Overview
Pure Java
More productive Java environment!
Targets Restful architectures
No compile, deploy, restart cycle - Fix the bug and hit
reload!
Clean template system - using Groovy, Scala template
Exact errors (including line numbers, even for templates)
Lots of built-in features for fast development
Starts fast, runs fast
Extensible by modules
Sẩm Bảo Chung Web development with Play

4. Main Concept
Simple stateless MVC architecture
Five cool things you can do with play
Fix the bug and hit Reload
Efficient template engine
JPA
Test driven development
Job
Sẩm Bảo Chung Web development with Play!

5. Play architecture MVC
The Play framework is fully stateless and
only request/response-oriented
4.AnHTTP Request is received by the
framework.
6.TheRouter component tries to find the
most specific route able to accept this
request.
8.The corresponding action method is
then invoked.
10.The application code is executed.
11.If a complex view needs to be
generated, a template file is rendered.
13.The result of the action method (HTTP
Response code, Content) is then written
as an HTTP Response.
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6. Routes file
A routes file help play controller routine
the request
GET / Ap p l i c a t i o n . i n d e x
GET / u s e r /{ username } Ap p l i c a t i o n . showUser
POST / u s e r Ap p l i c a t i o n . c r e a t
eUs e r
DELETE / u s e r /{ username } Ap p l i c a t i o n . d e
l e t eUs e r
GET / p u b l i c staticDir:public
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7. Model
A simple user
@Entity
public class User extends Model{
@Id
public long id;
@Required
@Column(unique = true)
public String username;
@Required
@Email
public String email;
}
Sẩm Bảo Chung Web development with Play

8. Controller
UserController
public class Application extends Controller {
public static void index() {
List<User> users = User.findAll();
render(users);
}
public static void showUser(String username) {
User user = User.find("byUsername",
username).first();
notFoundIfNull(user);
render(user);
}
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9. View
List users
(app/views/Application/index.html)
#{ extends ’main .html ’ /}
#{ set title :’Index ’ /}
<ul >
#{ list items :users , as:’user ’}
<li >
#{a @Application . showUser ( user .
username )}
${ user . username }
#{/ a}
with email address ${ user . email }
</li >
#{/ list }
</ul >
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10. Five cool things of Play!
Bind an HTTP parameter to a Java method parameter
Redirect to an action by calling the corresponding Java
method
render(…) , renderText(…), renderXML(…),
renderJSON(…), renderBinary(…), redirect(…)
Sẩm Bảo Chung Web development with Play

11. Five cool things of Play!
Don’t Repeat Yourself when passing Java objects to
templates
Play will automatically start the JPA Entity Manager
using Hibernate and magically synchronize it when code
is reloaded.
Sẩm Bảo Chung Web development with Play

12. Five cool things of Play!
Straightforward file upload management
#{form @uploadPhoto(), enctype:'multipart/form-
data'} <input type="text" name="title" /> <input
type="file" id="photo" name="photo" /> <input
type="submit" value="Send it..." /> #{/}
public static void uploadPhoto(String title, File photo)
{ ...
}
Sẩm Bảo Chung Web development with Play

13. Fix the bug and hit
Reload
Whenever an error occurs, the framework makes its best
effort to identify and show you the problem
Sẩm Bảo Chung Web development with Play

14. Job
 Doing the right thing at the right time
• Scheduled jobs (housekeeping)
• Bootstrap jobs (initial data providing)
• Suspendable requests (rendering a PDF
report without blocking the
• connection thread pool)
/* @Every("1h") */
@OnApplicationStart
public class LoadDataJob extends Job {
public void doJob() {
/* .. do whatever you want */
}
}
Sẩm Bảo Chung Web development with Play

15. Test driven development
The integrated test runner makes it easy for you do test-
driven development.
Sẩm Bảo Chung Web development with Play

16. Getting start
Using the play command
When the framework is correctly installed, open a shell
and execute play.
$ play
You should see the play default message.
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17. Getting start
Use the new command to create a new application.
# play new myApp
Sẩm Bảo Chung Web development with Play

18. Getting start
You can start with command
# play run myApp
Sẩm Bảo Chung Web development with Play

19. Modules
Some module on
http://www.playframework.org/modules
With:
Scala
Google App Engine
PDF Generation
SASS and SCSS
Google Web Toolkit
MongoDB
Simple search
Objectify
To install locally these modules use the install command:
play install gae-{version}
To add this module as dependency of your application, add it
to the dependencies.yml file:
require: - play -> gae {version}.
Sẩm Bảo Chung Web development with Play