SpringBoot整合WebSocket
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添加pom依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency>
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添加配置
@Configuration public class WebSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); } }
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编写WebSocket映射类
@ServerEndpoint(value = "/socket") @Controller public class WebSocketController implements Serializable { //静态变量,用来记录当前在线连接数。应该把它设计成线程安全的。 private static int onlineCount = 0; //concurrent包的线程安全Set,用来存放每个客户端对应的MyWebSocket对象。 private static CopyOnWriteArraySet<WebSocketController> webSocketSet = new CopyOnWriteArraySet<WebSocketController>(); //与某个客户端的连接会话,需要通过它来给客户端发送数据 private Session session; /** * 连接建立成功调用的方法*/ @OnOpen public void onOpen(Session session) { System.out.println(session.getAsyncRemote()); this.session = session; webSocketSet.add(this); //加入set中 addOnlineCount(); //在线数加1 System.out.println("有新连接加入!当前在线人数为" + getOnlineCount()); sendMessage("wsyjlly"); } /** * 连接关闭调用的方法 */ @OnClose public void onClose() { webSocketSet.remove(this); //从set中删除 subOnlineCount(); //在线数减1 System.out.println("有一连接关闭!当前在线人数为" + getOnlineCount()); } /** * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息*/ @OnMessage public void onMessage(String message, Session session){ System.out.println("来自客户端的消息:" + message); //群发消息 sendInfo(session.getId()); } /** * 发生错误时调用 * @OnError **/ public void onError(Session session, Throwable error) { System.out.println("发生错误"); error.printStackTrace(); } private void sendMessage(String message) { this.session.getAsyncRemote().sendText(message); } /** * 群发自定义消息 * */ private static void sendInfo(String message){ for (WebSocketController item : webSocketSet) { item.sendMessage(message); } } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { WebSocketController.onlineCount++; } public static synchronized void subOnlineCount() { WebSocketController.onlineCount--; } }