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@@ -0,0 +1,189 @@
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+package com.ktg.framework.websocket;
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+
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+import lombok.extern.slf4j.Slf4j;
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+import org.springframework.stereotype.Component;
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+
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+import javax.websocket.*;
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+import javax.websocket.server.PathParam;
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+import javax.websocket.server.ServerEndpoint;
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+import java.io.IOException;
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+import java.util.ArrayList;
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+import java.util.Collections;
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+import java.util.List;
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.concurrent.CopyOnWriteArraySet;
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+
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+@Component
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+@ServerEndpoint("/websocket/android/{code}")
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+@Slf4j
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+public class WebSocketAndroid {
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+ private Session session;
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+ private String code;
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+ // 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。
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+ private static int onlineCount = 0;
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+ private static CopyOnWriteArraySet<WebSocketAndroid> webSocketSet = new CopyOnWriteArraySet<>();
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+ //concurrent包的线程安全set，用来存放每个客户端对应的MyWebSocket对象
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+ private static ConcurrentHashMap<String, WebSocketAndroid> webSocketMap2 = new ConcurrentHashMap();
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+
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+ // 为了保存在线用户信息，在方法中新建一个list存储一下【实际项目依据复杂度，可以存储到数据库或者缓存】
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+ private final static List<Session> SESSIONS = Collections.synchronizedList(new ArrayList<>());
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+ private Thread heartbeatThread;
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+
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+ /**
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+ * 建立连接
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+ *
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+ * @param session
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+ * @param code
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+ */
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+ @OnOpen
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+ public void onOpen(Session session, @PathParam("code") String code) {
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+ this.session = session;
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+ this.code = code;
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+ webSocketSet.add(this);
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+ SESSIONS.add(session);
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+ if (webSocketMap2.containsKey(code)) {
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+ webSocketMap2.remove(code);
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+ webSocketMap2.put(code, this);
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+ } else {
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+ webSocketMap2.put(code, this);
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+ addOnlineCount();
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+ }
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+ // 心跳机制
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+ heartbeatThread = new Thread(() -> {
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+ try {
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+ sendHeartbeats(session, code);
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+ } catch (IOException e) {
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+ e.printStackTrace();
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+ }
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+ });
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+ heartbeatThread.start();
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+ log.info("[连接ID:{}] 建立连接, 当前连接数:{}", this.code, webSocketMap2.size());
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+ log.info("线程序号{}, 当前存活线程数{}", heartbeatThread.getId(), Thread.activeCount());
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+
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+ }
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+
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+ private void sendHeartbeats(Session session, String code) throws IOException {
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+ int heartbeatInterval = 60000; // 60 seconds
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+ while (true) {
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+ try {
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+ Thread.sleep(heartbeatInterval);
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+ session.getBasicRemote().sendText("heartbeat");
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+ } catch (InterruptedException | IOException e) {
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+ break;
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 断开连接
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+ */
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+ @OnClose
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+ public void onClose() {
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+ webSocketSet.remove(this);
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+ if (webSocketMap2.containsKey(code)) {
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+ webSocketMap2.remove(code);
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+ subOnlineCount();
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+ }
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+ // 关闭当前线程
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+ if (heartbeatThread != null && heartbeatThread.isAlive()) {
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+ log.info("关闭线程序号{}, 当前存活线程数{}", heartbeatThread.getId(), Thread.activeCount());
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+ heartbeatThread.interrupt(); // Interrupt the heartbeat thread
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+ try {
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+ heartbeatThread.join(); // Wait for the thread to finish
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+ } catch (InterruptedException e) {
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+ log.error("Error joining heartbeat thread for connection ID: {}", code, e);
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+ log.info("关闭线程序号{}, 当前存活线程数{}", Thread.currentThread().getId(), Thread.activeCount());
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+ Thread.currentThread().interrupt(); // Restore the interruption status
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+ }
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+ }
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+ log.info("[连接ID:{}] 断开连接, 当前连接数:{}", code, webSocketMap2.size());
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+ }
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+
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+ /**
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+ * 发送错误
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+ *
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+ * @param session
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+ * @param error
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+ */
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+ @OnError
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+ public void onError(Session session, Throwable error) {
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+ log.info("[连接ID:{}] 错误原因:{}", this.code, error.getMessage());
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+ error.printStackTrace();
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+ // 发生错误时，关闭连接
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+ // conn.close(500, "连接出错");
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+ }
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+
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+ /**
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+ * 收到消息
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+ *
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+ * @param message
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+ */
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+ @OnMessage
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+ public void onMessage(String message) {
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+ // log.info("【websocket消息】收到客户端发来的消息:{}", message);
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+ log.info("[连接ID:{}] 收到消息:{}", this.code, message);
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+ }
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+
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+ /**
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+ * 发送消息
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+ *
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+ * @param message
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+ * @param code
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+ */
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+ public static void sendMessage(String code, String message) {
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+ WebSocketAndroid webSocketIots = webSocketMap2.get(code);
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+ log.info("【websocket消息】推送消息, webSocketServer={}", webSocketIots);
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+ if (webSocketIots != null) {
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+ log.info("【websocket消息】推送消息, message={}", message);
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+ try {
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+ webSocketIots.session.getBasicRemote().sendText(message);
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ log.error("[连接ID:{}] 发送消息失败, 消息:{}", code, message, e);
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 群发消息
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+ *
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+ * @param message
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+ */
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+ public static void sendMassMessage(String message) {
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+ try {
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+ for (Session session : SESSIONS) {
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+ if (session.isOpen()) {
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+ session.getBasicRemote().sendText(message);
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+ log.info("[连接ID:{}] 发送消息:{}", session.getRequestParameterMap().get("code"), message);
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+ }
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+ }
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ }
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+ }
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+
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+ /**
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+ * 获取当前连接数
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+ *
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+ * @return
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+ */
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+ public static synchronized int getOnlineCount() {
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+ return onlineCount;
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+ }
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+
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+ /**
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+ * 当前连接数加一
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+ */
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+ public static synchronized void addOnlineCount() {
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+ WebSocketAndroid.onlineCount++;
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+ }
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+
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+ /**
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+ * 当前连接数减一
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+ */
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+ public static synchronized void subOnlineCount() {
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+ WebSocketAndroid.onlineCount--;
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+ }
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+
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+}
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+
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