Java websocket client github

Java websocket client github

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What is a WebSocket client in Java?

A WebSocket client in Java refers to the role of a Java program that establishes a connection with a WebSocket server and exchanges messages with it using the WebSocket protocol. The WebSocket protocol allows for bidirectional, real-time communication between a client (usually a web browser or a mobile app) and a server over the internet.

To create a WebSocket client in Java, you can use a third-party library such as Apache WebSocket Client or Jetty WebSocket Client. These libraries provide APIs for establishing a connection to a WebSocket server, sending and receiving messages, and handling errors.

Here is an example of how to use the Apache WebSocket Client in Java:

import org.apache.tomcat.websocket.WsClient;
import org.apache.tomcat.websocket.WsSession;
public class WebSocketClient {
public static void main(String[] args) throws Exception {
// Create a WsClient instance
WsClient wsClient = new WsClient();
// Set the URL of the WebSocket server
String url = "ws://example.com/chat";
// Establish the connection to the WebSocket server
WsSession session = wsClient.connect(url);
// Send a message to the WebSocket server
session.getRemote().sendText("Hello, world!");
// Receive messages from the WebSocket server
while (true) {
String message = session.getRemote().receiveText();
System.out.println(message);
}
}
}

In this example, we create a WsClient instance and set the URL of the WebSocket server. We then establish a connection to the server using the connect() method and send a message to it using the sendText() method. We also use a loop to receive messages from the server using the receiveText() method.

Handling errors is an important part of creating a robust WebSocket client in Java. The Apache WebSocket Client provides several APIs for handling errors, including:

Here is an example of how to use these APIs:

wsClient.setOnError(new WsSession.OnError() {
public void onError(WsSession session, Exception e) {
System.out.println("Error occurred: " + e.getMessage());
}
});
wsClient.getErrorMessage();

In this example, we set up an onError() handler to print the error message when an error occurs. We also use the getErrorMessage() method to retrieve the last error message sent by the server.

Overall, creating a WebSocket client in Java requires using a third-party library such as Apache WebSocket Client or Jetty WebSocket Client. These libraries provide APIs for establishing a connection to a WebSocket server, sending and receiving messages, and handling errors.