2021-08-05

web-socket-servlet/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-war")
+}
+
+dependencies {
+    providedCompile ("javax.servlet:javax.servlet-api:4.0.1")
+    implementation("javax.websocket:javax.websocket-api:1.1")
+}

web-socket-servlet/src/main/java/kr/pe/elex/examples/WebSocketServlet.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 org.jetbrains.annotations.NotNull;
+
+import javax.websocket.*;
+import javax.websocket.server.ServerEndpoint;
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.util.HashSet;
+import java.util.Set;
+
+@ServerEndpoint("/")
+public class WebSocketServlet {
+	private static final Set<Session> sessions;
+
+	static {
+		sessions = new HashSet<>();
+	}
+
+	@OnOpen
+	public void onOpen(@NotNull Session session) throws IOException {
+		sessions.add(session);//session.
+		session.getBasicRemote().sendText("Hello");
+		session.getUserProperties().put("createdOn", LocalDateTime.now());
+	}
+
+	@OnClose
+	public void onClose(Session session) {
+		sessions.remove(session);
+		session = null;
+	}
+
+	@OnMessage
+	public void onMessage(@NotNull Session session, String message) throws IOException {
+		session.getBasicRemote().sendText("you said, " + message);
+	}
+
+	@OnError
+	public void onError(Session session, Throwable e) {
+
+	}
+
+	public static void broadcast(final String message){
+		sessions.forEach(session -> {
+			if (null!=session && session.isOpen()) {
+				session.getAsyncRemote().sendText(message);
+			}
+		});
+	}
+}

web-socket-servlet/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;