Play Framework Cookbook - Second Edition

Play Framework Cookbook - Second Edition

By : Alexander Reelsen, Giancarlo Inductivo

Buy this Book

Play Framework Cookbook - Second Edition

By: Alexander Reelsen, Giancarlo Inductivo

Buy this Book

Overview of this book

<p>As web and mobile systems become more sophisticated, anchoring systems in a mature, solid framework has become increasingly important. Play 2 provides developers with the necessary tools to build robust web applications.</p> <p>This book is a compilation of useful recipes aimed at helping developers discover the power of Play 2. The introductory section serves as a primer to Play Framework, wherein all the fundamentals of the framework are covered extensively. It then explains the usage of controllers and how modules can be leveraged for optimal performance. Next, the book walks you through creating and using APIs, followed by extensive real-world applications. Finally, you will learn to manage applications post production.</p>

Play Framework Cookbook Second Edition

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Basics of Play Framework

Introduction

Installing Play Framework

Creating a Play application using Typesafe Activator

Using the Play console

Working with modules

Working with controllers and routes

Using Action parameters in controllers

Using reverse routing and redirects

Working with View templates

Using helper tags

Using View layouts and Includes

Working with XML and text files

Using Ebean (Java) with MySQL

Using Anorm (Scala) and database evolutions with MySQL

Using a form template and web action

Using form validation

Securing form submission

Testing with JUnit (Java) and specs2 (Scala)

Using Controllers

Using futures with Akka actors

Leveraging Modules

Introduction

Dependency injection with Spring

Dependency injection using Guice

Utilizing MongoDB

Utilizing MongoDB and GridFS

Utilizing Redis

Integrating Play application with Amazon S3

Integrating with Play application Typesafe Slick

Utilizing play-mailer

Integrating Bootstrap and WebJars

Creating and Using Web APIs

Introduction

Creating a POST API endpoint

Creating a GET API endpoint

Creating a PUT API endpoint

Creating a DELETE API endpoint

Securing API endpoints with HTTP basic authentication

Consuming external web APIs

Using the Twitter API and OAuth

Creating Plugins and Modules

Introduction

Creating and using your own plugin

Building a flexible registration module

Using the same model for different applications

Managing module dependencies

Adding private module repositories using Amazon S3

Practical Module Examples

Introduction

Integrating a Play application with message queues

Integrating a Play application with ElasticSearch

Implementing token authentication using JWT

Deploying Play 2 Web Apps

Introduction

Deploying a Play application on Heroku

Deploying a Play application on AWS Elastic Beanstalk

Deploying a Play application on CoreOS and Docker

Deploying a Play application with Dokku

Deploying a Play application with Nginx

Additional Play Information

Introduction

Testing with Travis CI

Monitoring with New Relic

Integrating a Play application with AngularJS

Integrating a Play application with Parse.com

Creating a Play development environment using Vagrant

Coding Play 2 web apps with IntelliJ IDEA 14

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Working with View templates

You expect to be able to send some data back to the View itself in web applications; this is quite straightforward with Play Framework. A Play View template is simply a text file that contains directives, web markup tags, and template tags. The View Template files also follow standard naming conventions and they are placed in predefined directories within the Play project directory, which makes it easier to manage template files.

How to do it...

For Java, we need to take the following steps:

Run the foo_java application with Hot-Reloading enabled.
Create the view file products.scala.html in foo_java/app/views/. Add the contents of the view file:
```
    @(products: Collection[String])

    <h3>@products.mkString(",")</h3>
```

Edit foo_java/app/controllers/Application.java by adding the following action:

    private static final java.util.Map<Integer, String> productMap = new java.util.HashMap<Integer, String>();

    static {
      productMap.put(1, "Keyboard");
      productMap.put(2, "Mouse");
      productMap.put(3, "Monitor");
    }

    public static Result listProducts() {
      return ok(products.render(productMap.values()));
    }

Edit foo_java/conf/routes by adding the following line:

    GET    /products    controllers.Application.listProducts

View the products page using a web browser:
```
http://localhost:9000/products
```

For Scala, we need to take the following steps:

Run the foo_scala application with Hot-Reloading enabled.
Create the view file products.scala.html in foo_scala/app/views/. Add the contents of the view file:
```
    @(products: Seq[String])

    <h3>@products.mkString(",")</h3>
```

Edit foo_scala/app/controllers/Application.scala by adding the following action:

    private val productMap = Map(1 -> "Keyboard", 2 -> "Mouse", 3 -> "Monitor")
    def listProducts() = Action {
      Ok(views.html.products(productMap.values.toSeq))
    }

Edit foo_scala/conf/routes by adding the following line:

    GET    /products    controllers.Application.listProducts

View the products page using a web browser:
```
http://localhost:9000/products
```

How it works...

In this recipe, we were able to retrieve a collection of data from the server side and display the contents of the collection in our View template. For now, we use a static collection of String objects to display in the View template instead of retrieving some data set from a database, which we will tackle in the upcoming recipes.

We introduced declaring parameters in View templates by declaring them in the first line of code in our view template and passing data into our View templates from the controller.

Play Framework Cookbook - Second Edition

By : Alexander Reelsen, Giancarlo Inductivo

Play Framework Cookbook - Second Edition

By: Alexander Reelsen, Giancarlo Inductivo

Overview of this book

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Current Title:

Play Framework Cookbook - Second Edition

Working with View templates

How to do it...

How it works...