2021-08-05

web-socket-client/build.gradle.kts

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+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+plugins {
+    id("elex-java")
+}
+
+dependencies {
+    implementation("javax.websocket:javax.websocket-client-api:1.1")
+    implementation("org.eclipse.jetty.websocket:javax-websocket-client-impl:9.4.43.v20210629")
+
+}

web-socket-client/src/main/java/kr/pe/elex/examples/WebSocketClient.java

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+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+import org.jetbrains.annotations.NotNull;
+
+import javax.websocket.*;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.ByteBuffer;
+
+@Slf4j
+@ClientEndpoint
+public class WebSocketClient {
+	private Session session = null;
+	private WebSocketMessageHandler messageHandler;
+
+	public WebSocketClient(URI endpointURI) {
+		try {
+			WebSocketContainer container = ContainerProvider.getWebSocketContainer();
+			container.connectToServer(this, endpointURI);
+		} catch (Exception e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	/**
+	 * Callback hook for Connection open events.
+	 *
+	 * @param session the userSession which is opened.
+	 */
+	@OnOpen
+	public void onOpen(@NotNull Session session) throws IOException {
+		log.info("opening websocket");
+		this.session = session;
+		//session.getBasicRemote().sendText("Hi~~");
+	}
+
+	/**
+	 * Callback hook for Connection close events.
+	 *
+	 * @param session the userSession which is getting closed.
+	 * @param reason  the reason for connection close
+	 */
+	@OnClose
+	public void onClose(Session session, CloseReason reason) {
+		log.info("closing websocket");
+		this.session = null;
+	}
+
+	/**
+	 * Callback hook for Message Events. This method will be invoked when a client send a message.
+	 *
+	 * @param message The text message
+	 */
+	@OnMessage
+	public void onMessage(String message) {
+		if (this.messageHandler != null) {
+			this.messageHandler.handleMessage(message);
+		}
+	}
+
+	@OnMessage
+	public void onMessage(PongMessage message) {
+		if (this.messageHandler != null) {
+			this.messageHandler.handleMessage("pong: " + message.toString());
+		}
+	}
+
+	/**
+	 * register message handler
+	 *
+	 * @param msgHandler
+	 */
+	public void setMessageHandler(WebSocketMessageHandler msgHandler) {
+		this.messageHandler = msgHandler;
+	}
+
+	/**
+	 * Send a message.
+	 *
+	 * @param message
+	 */
+	public void sendMessage(String message) throws IOException {
+		this.session.getBasicRemote().sendText(message);
+	}
+
+	public void sendMessage(ByteBuffer message) throws IOException {
+		this.session.getBasicRemote().sendBinary(message);
+	}
+
+	public void sendMessageAsync(String message) {
+		this.session.getAsyncRemote().sendText(message);
+	}
+
+	public void sendMessageAsync(ByteBuffer message) {
+		this.session.getAsyncRemote().sendBinary(message);
+	}
+
+	public static void main(String... args) throws URISyntaxException, IOException {
+		WebSocketClient client = new WebSocketClient(new URI("ws://localhost:8080/websocket"));
+		client.setMessageHandler(new WebSocketMessageHandler() {
+			@Override
+			public void handleMessage(final String message) {
+				log.info("Rx: {}", message);
+			}
+		});
+		client.sendMessage("Hello");
+	}
+}

web-socket-client/src/main/java/kr/pe/elex/examples/WebSocketMessageHandler.java

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+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+/**
+ * Message handler.
+ *
+ */
+public interface WebSocketMessageHandler {
+	public void handleMessage(String message);
+}

web-socket-client/src/main/java/kr/pe/elex/examples/package-info.java

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+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;