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Websocket,JSON in JEE7

PrasannaKumar Sathyanarayanan
PrasannaKumar Sathyanarayanan

This document discusses Java API specifications for WebSockets (JSR 356) and JSON processing (JSR 353) in Java EE 7. It provides an overview of creating and consuming WebSocket endpoints and messages on both the client and server sides using annotations and message encoder/decoder classes. Code examples are given for defining server and client WebSocket endpoints, sending messages between endpoints, and using Java objects with WebSocket messages. The document also lists some artifacts like the Tyrus reference implementation and GlassFish promoted builds for working with these APIs.

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Java API for WebSockets & JSONP in JEE7 Prasanna Kumar S
JSR 356 - Java API for Websocket Creating WebSocket Java components to handle bi- directional WebSocket conversations Initiating and intercepting WebSocket events Creation and consumption of WebSocket text and binary messages The abililty to define WebSocket protocols and content models for an application Heads up on JSR's
Heads up on JSR's (Contd.) JSR 353 - JAva API for JSON processing Produce and consume JSON text in a streaming fashion Build a Java object model for JSON text using API classes Binding of JSON text to Java objects and vice versa.
Websocket - Server endpoint @ServerEndpoint(value = "/HomeWS", encoders = {DataEncoder.class}, decoders = {DataDecoder.class}) public class HomeWS { @OnOpen public void onOpen(Session peer) {} @OnClose public void onClose(Session peer) {} @OnMessage public void broadCastMessage(GameData figure, Session session) throws IOException, EncodeException { } } WebSocket - Server Endpoint clients call with this URL
Websocket - client endpoint @ClientEndpoint(decoders = {DataDecoder.class}, encoders = {DataEncoder.class}) public class SignalChangeEndpointClient { @OnOpen public void onOpen(Session session) throws IOException, EncodeException {} } WebSocket - Client Endpoint has no url value
public class DataDecoder implements Decoder.Text<GameData> { @Override public GameData decode(String string) throws DecodeException { JsonObject jsonObject = Json.createReader( new StringReader(string)).readObject(); return new GameData(jsonObject); } } public class DataEncoder implements Encoder.Text<GameData> { @Override public String encode(GameData figure) throws EncodeException { return figure.getJson().toString(); } } WebSocket - Message Carriers
this code could be used with any java object to initiate a websocket message EJB Servlet JSF handler WebSocket - Message Sending Client //... WebSocketContainer container = ContainerProvider.getWebSocketContainer(); String uri = "ws://websocket.appserver.org/websocket"; // illustrative URL container.connectToServer(SignalChangeEndpointClient.class, URI.create(uri)); //...
Artifacts for the well grounded .... Tyrus - a RI of JSR 356 http://tyrus.java.net/ for the impatient .... GlassFish 4 (JEE7) - via Promoted builds http://download.java.net/glassfish/4.0/promoted/ upcoming WildFly http://www.wildfly.org/
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Websocket,JSON in JEE7

  • 1. Java API for WebSockets & JSONP in JEE7 Prasanna Kumar S
  • 2. JSR 356 - Java API for Websocket Creating WebSocket Java components to handle bi- directional WebSocket conversations Initiating and intercepting WebSocket events Creation and consumption of WebSocket text and binary messages The abililty to define WebSocket protocols and content models for an application Heads up on JSR's
  • 3. Heads up on JSR's (Contd.) JSR 353 - JAva API for JSON processing Produce and consume JSON text in a streaming fashion Build a Java object model for JSON text using API classes Binding of JSON text to Java objects and vice versa.
  • 4. Websocket - Server endpoint @ServerEndpoint(value = "/HomeWS", encoders = {DataEncoder.class}, decoders = {DataDecoder.class}) public class HomeWS { @OnOpen public void onOpen(Session peer) {} @OnClose public void onClose(Session peer) {} @OnMessage public void broadCastMessage(GameData figure, Session session) throws IOException, EncodeException { } } WebSocket - Server Endpoint clients call with this URL
  • 5. Websocket - client endpoint @ClientEndpoint(decoders = {DataDecoder.class}, encoders = {DataEncoder.class}) public class SignalChangeEndpointClient { @OnOpen public void onOpen(Session session) throws IOException, EncodeException {} } WebSocket - Client Endpoint has no url value
  • 6. public class DataDecoder implements Decoder.Text<GameData> { @Override public GameData decode(String string) throws DecodeException { JsonObject jsonObject = Json.createReader( new StringReader(string)).readObject(); return new GameData(jsonObject); } } public class DataEncoder implements Encoder.Text<GameData> { @Override public String encode(GameData figure) throws EncodeException { return figure.getJson().toString(); } } WebSocket - Message Carriers
  • 7. this code could be used with any java object to initiate a websocket message EJB Servlet JSF handler WebSocket - Message Sending Client //... WebSocketContainer container = ContainerProvider.getWebSocketContainer(); String uri = "ws://websocket.appserver.org/websocket"; // illustrative URL container.connectToServer(SignalChangeEndpointClient.class, URI.create(uri)); //...
  • 8. Artifacts for the well grounded .... Tyrus - a RI of JSR 356 http://tyrus.java.net/ for the impatient .... GlassFish 4 (JEE7) - via Promoted builds http://download.java.net/glassfish/4.0/promoted/ upcoming WildFly http://www.wildfly.org/