Java Coding Problems

269. WebSocket

The HTTP Client supports the WebSocket protocol. In API terms, the core of the implementation is the java.net.http.WebSocket interface. This interface exposes a suite of methods for handling WebSocket communication.

Building a WebSocket instance asynchronously can be accomplished via HttpClient.newWebSocketBuilder().buildAsync().

For example, we can connect to the well known Meetup RSVP WebSocket endpoint (ws://stream.meetup.com/2/rsvps), as follows:

HttpClient client = HttpClient.newHttpClient();WebSocket webSocket = client.newWebSocketBuilder()  .buildAsync(URI.create("ws://stream.meetup.com/2/rsvps"),     wsListener).get(10, TimeUnit.SECONDS);

By its nature, the WebSocket protocol is bidirectional. In order to send data, we ...