Table of Contents
What is the purpose of WebSocket in Java?
WebSocket provides an alternative to the limitation of efficient communication between the server and the web browser by providing bi-directional, full-duplex, real-time client/server communications. The server can send data to the client at any time.
What are the two message types in WebSocket?
Message Types The WebSocket specification supports two on-wire data formats – text and binary. The API supports both these formats, adds capabilities to work with Java objects and health check messages (ping-pong) as defined in the specification: Text: Any textual data ( java.lang.String, primitives or their equivalent wrapper classes)
Which is the JSR 356 API for WebSocket?
The JSR 356 API is very simple and the annotation based programming model that makes it very easy to build WebSocket applications. To run the application we built in the example, all we need to do is deploy the war file in a web server and go to the URL: http://localhost:8080/java-websocket/. You can find the link to the repository here.
When to clear an endpoint in Java WebSocket?
If at some point an error occurs, the method with the annotation @OnError handles it. You can use this method to log the information about the error and clear the endpoints. Finally, when a user is no longer connected to the chat, the method @OnClose clears the endpoint and broadcasts to all users that a user has been disconnected. 4. Message Types
Why is WebSocket important in Java EE 7?
WebSocket also provides greater scalability for message-intensive applications because only one connection per client is used (whereas HTTP creates one request per message). Finally, WebSocket is part of Java EE 7, so you can use other technologies in the Java EE 7 stack.
What are the disadvantages of using WebSocket?
These disadvantages result in less efficient communication between the server and the web browser, especially for real-time applications. WebSocket provides an alternative to this limitation by providing bi-directional, full-duplex, real-time, client/server communications. The server can send data to the client at any time.
What is the purpose of the WebSocket protocol?
Introduced as part of the HTML 5 initiative, the WebSocket protocol is a standard web technology that simplifies communication and connection management between clients and a server. By maintaining a constant connection, WebSocket provides full-duplex client/server communication.
How to define WebSocket endpoint path in Java?
Define the WebSocket server endpoint path by adding the following code: The WebSocket lifecycle annotations are mapped to Java methods.