Dive into Play Framework

Dive into Framework

Maher Gamal

Key Features

● Agile development workflow ( Save, Reload ! )

● Stateless architecture

● Clear error reporting

● Reusable modules & plugins

● Gets you up and running quickly !

Project Layout : play new proj1

● proj1/app/controllers
● proj1/app/models
● proj1/app/views

● proj1/conf/application.conf
● proj1/conf/messages
● proj1/conf/routes

● proj1/lib
● proj1/public
● proj1/test

Routing : /conf/routes

● Examples

GET /profile/view/{id} ProfileController.view
POST /profile/save ProfileController.save
GET /{<ar|en>lang}/ HomeController.index
* /{controller}/{action} {controller}.{action}

● Defining the URLs early, forces you to explore your website

● You can use annotations too (with the play-router module)

Controllers : /app/controllers

import play.mvc.Controller;

public class ProfileController extends Controller {

public static void view(Long id) {
// ...
renderText("123"); // or json, xml.
renderTemplate("Users/show.html");
redirect("....");
HomeController.index(); // Does a redirect
// ...
}
}

Models : /app/models

import play.db.jpa.Model;
import javax.persistence.Entity;

@Entity
public class User extends Model {

public String email;

public String password;
}

Validations : /app/models

import play.db.jpa.Model;
import javax.persistence.Entity;
import play.data.validation.*;

@Entity
public class User extends Model {
@Email @Required
public String email;
@Required @MinSize(5)
public String password;
}

Validations : /app/controllers

import play.mvc.Controller;

public class ProfileController extends Controller {

public static void view(@Valid Profile profile) {
render(profile);
// or invoke the validation manually !
// validation.valid(profile)
}
}

Views : /app/views

/app/views/ProfileController/view.html

#{ifErrors}

<ul class="error">
#{errors}
<li>${error}</li>
#{/errors}
</ul>

#{/ifErrors}

Views : /app/views

/app/views/ProfileController/view.html
#{extends 'main.html' /}
#{set title : 'Page Title' /}
#{set 'moreScripts'}
...
#{/set}

/app/views/main.html
<html>
<head>
<title>#{get 'title' /}</title>
#{get 'moreScripts' /}
</head>
</html>

Views : /app/views

/app/views/main.html
<html>
<head>
<title>#{get 'title' /}</title>
#{get 'moreScripts' /}
</head>
<body>
...
#{doLayout /}
...
</body>
</html>

Jobs : /app/jobs

public class BootstrapJob extends Job {

@Override
public void doJob() {
...
}
}

Jobs : /app/jobs

@OnApplicationStart

@Override
...
}
}

Jobs : /app/jobs

@Every("1h") or @On("0 0 * * *")

@Override
...
}
}

Helper Libraries : play.libs.*

● MD5 , SHA1 , Base64 Encoding/Decoding
● Encryption , decryption , hashing
● File/Directory copying , deleting and I/O methods
● Image resizing , cropping and captcha generation
● Mail message preparation and sending
● OAuth Integration
● OpenID Integration
● HttpClient to call external web services
● XML Parsing

Running

● play new proj1

● play run proj1

● play clean,run proj1

● play netbeansify proj1

● play help

Resources

● Documentation
○ playframework.org/documentation
○ playframework.org/documentation/api/1.1.1/index.html

● Community
○ playframework.org/community
○ play.lighthouseapp.com
○ groups.google.com/group/play-framework

● Modules and Examples
○ playframework.org/modules
○ Check samples-and-tests directory in the release

Dive into Play Framework

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Dive into Play Framework