java WebSocket

WebSocket is a protocol that enables two-way communication between a client and a server over a single, long-lived connection. It allows real-time data transfer between the client and server, making it ideal for applications that require continuous streaming of data.

Java provides a standard API for implementing WebSocket servers and clients. The API is part of the Java EE 7 specification and is available in the javax.websocket package.

To create a WebSocket server in Java, you need to implement the javax.websocket.Endpoint interface and override its onOpen, onClose, onMessage, and onError methods. These methods handle the connection opening, closing, message receiving, and error handling, respectively.

To create a WebSocket client in Java, you need to use the javax.websocket.ClientEndpoint interface and the javax.websocket.ContainerProvider class. The ContainerProvider class provides a method that returns a WebSocket container, which manages the client-side WebSocket connections.

Once you have created the WebSocket server and client, you can use them to exchange messages between the client and server in real-time. The messages can be in any format, such as text, binary, or JSON.

Overall, Java provides a powerful and easy-to-use API for implementing WebSocket servers and clients, making it an ideal choice for developing real-time web applications.