Java WebSocket Programming by Dr. Danny Coward

By Dr. Danny Coward

Grasp software improvement with Java WebSocket construct dynamic company net functions that totally leverage state of the art verbal exchange applied sciences. Written through the top specialist on Java WebSocket programming, this Oracle Press advisor bargains useful improvement ideas and specified instance functions. Java WebSocket Programming explains the way to layout client/server functions, contain full-duplex messaging, determine connections, create endpoints, deal with course mapping, and safe information. You’ll additionally how to encrypt internet transmissions and increase legacy functions with Java WebSocket. increase internet functions utilizing the Java WebSocket API Create and put up annotated and programmatic endpoints deal with the lifecycle occasions of WebSocket endpoints hold trustworthy connections around the endpoint lifecycle deal with synchronous and asynchronous messaging outline encoding and interpreting innovations for complicated messaging Configure message timeouts, measurement limits, and exceptions Map message paths and path incoming URIs to net packing containers safe facts, authenticate clients, and encrypt connections

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The endpoint may obtain a reference to a RemoteEndpoint object through the Session object that uniquely represents the client to which it is connected in order to send it a message. indd 19 8/8/13 2:49 PM ORACLE FL / Java WebSocket Programming / Danny Coward / 719-6 / Chapter 1 20 Java WebSocket Programming Server Client RemoteEndpoint Session MessageHandler MessageHandler Endpoint Endpoint Session Client MessageHandler MessageHandler RemoteEndpoint FIGURE 1-6. An object snapshot of a Java WebSocket server application an annotated endpoint.

We will see how they can be applied in a sample application in both annotated and programmatic form. The WebSocket Protocol We’ll start with a little background on the WebSocket protocol itself. Readers need not know every detail of this section in order to be able to use the Java WebSocket API, but it serves as a useful background to help in a general understanding of WebSocket technology and why the Java WebSocket API is the way it is. Unlike HTTP-based technologies, the WebSockets have a lifecycle that is underpinned by the WebSocket protocol itself.

We will see that each WebSocket lifecycle event is accompanied by different qualifying information. Therefore, there are a number of options for what the possible method signatures can be for Java methods annotated with the lifecycle annotations. @OnOpen Let’s start with the first one: @OnOpen. This annotation is used on a method of an annotated endpoint to indicate that it should be called when a new connection has been established to this endpoint. The main reason to have a method to handle the open event is so that you can do any kind of setup of information you might need during the WebSocket conversation.

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