Book Image

Developing RESTful Services with JAX-RS 2.0, WebSockets, and JSON

By : Bhakti Mehta, Masoud Kalali
Book Image

Developing RESTful Services with JAX-RS 2.0, WebSockets, and JSON

By: Bhakti Mehta, Masoud Kalali

Overview of this book

<p>As the technology landscape moves focus towards smaller devices, the need for building scalable, flexible, lightweight, and real-time communications-based applications grows. HTML 5 and Java EE 7 provide a new synthesis of technologies that demonstrate tremendous scope and potential in areas of device independence, asynchronous communication, interoperability, and portability.<br /><br />Developing RESTful Services with JAX-RS 2.0, WebSockets, and JSON is a practical, hands-on guide that provides you with clear and pragmatic information to take advantage of the real power behind HTML5 and Java EE technologies. This book also gives you a good foundation for using them in your applications.<br /><br />Developing RESTful Services with JAX-RS 2.0, WebSockets, and JSON looks at the different HTML5-based Java EE 7 API, and takes a deep dive into the individual areas of technologies to cover basic to advanced concepts, and also provides best practices for each API. You will also learn how to build a REST-based Event Notification Application using the Twitter API, tying all the different technologies together that we will cover. You will also take a look at integrating different Java EE APIs to build a Library Application. If you want to take advantage of using the new HTML5 technologies and Java EE 7 platform, then this is the book for you. You will learn everything you need to know to build portable RESTful Web Services with JAX-RS 2.0, Web Sockets, JSON, and Server-Sent Events.</p>
Table of Contents (12 chapters)

Encoders and decoders in Java API for WebSockets


As seen in the previous chapter, the class-level annotation @ServerEndpoint indicates that a Java class is a WebSocket endpoint at runtime. The value attribute is used to specify a URI mapping for the endpoint. Additionally the user can add encoder and decoder attributes to encode application objects into WebSocket messages and WebSocket messages into application objects.

The following table summarizes the @ServerEndpoint annotation and its attributes:

Annotation

Attribute

Description

@ServerEndpoint

 

This class-level annotation signifies that the Java class is a WebSockets server endpoint.

 

value

The value is the URI with a leading '/.'

 

encoders

Contains a list of Java classes that act as encoders for the endpoint. The classes must implement the Encoder interface.

 

decoders

Contains a list of Java classes that act as decoders for the endpoint. The classes must implement the Decoder interface.

 

configurator

The configurator...