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WebSocketEchoClient.java - WebSocket Echo Client
How to write a simple client program to connect to the WebSocket Echo Server?
✍: FYIcenter.com
I you want to write a simple client program to connect to the WebSocket Echo Server
running at wss://echo.websocket.org,
you can follow these suggestions:
1. Write a test Java class annotated as @ClientEndpoint:
@ClientEndpoint public class WebSocketEchoClient {
2. Create a Session instance with the WebSocket Echo Server:
WebSocketContainer c = ContainerProvider.getWebSocketContainer(); URI u = new URI("wss://echo.websocket.org"); Session s = c.connectToServer(WebSocketClassInfo.class, u);
3. Send a text message to the server:
RemoteEndpoint.Basic r = s.getBasicRemote(); r.sendText("Hello there!");
4. Put the thread to sleep for sometime for the server to prcess the message:
Thread.sleep(1000*2); s.close();
5. Write a method annotated as @OnMessage to receive the message echoed back from the server:
@OnMessage public void OnMessage(String message) { System.out.println("Message received: "+message); }
Here is the entir test program, WebSocketClassInfo.java:
// Copyright (c) 2016 FYIcenter.com import java.net.URI; import javax.websocket.ClientEndpoint; import javax.websocket.OnMessage; import javax.websocket.ContainerProvider; import javax.websocket.Session; import javax.websocket.WebSocketContainer; import javax.websocket.*; @ClientEndpoint public class WebSocketEchoClient { public static void main(String[] args) throws Exception { WebSocketContainer c = ContainerProvider.getWebSocketContainer(); URI u = new URI("wss://echo.websocket.org"); Session s = c.connectToServer(WebSocketEchoClient.class, u); System.out.println("WebSocket session info:"); System.out.println(" Protocol version: "+s.getProtocolVersion()); System.out.println(" Request URI: "+s.getRequestURI()); RemoteEndpoint.Basic r = s.getBasicRemote(); r.sendText("Hello there!"); Thread.sleep(1000*2); s.close(); } @OnMessage public void OnMessage(String message) { System.out.println("Message received: "+message); } }
You can compile and run the above example in a command window with Java SE JDK 8 and the tyrus-standalone-client.jar from Java EE 7 SDK:
>\fyicenter\jdk-1.8.0\bin\javac -cp \fyicenter\glassfish4\mq\lib\tyrus-standalone-client.jar WebSocketEchoClient.java >\fyicenter\jdk-1.8.0\bin\java -cp .;\fyicenter\glassfish4\mq\lib\tyrus-standalone-client.jar WebSocketEchoClient WebSocket session info: Protocol version: 13 Request URI: wss://echo.websocket.org Message received: Hello there!
⇒ WebSocketOpenClose.java - Session Open and Close
⇐ WebSocket Client Class Object Information
2018-01-16, 1619👍, 0💬
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